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CT HiSpeed Series Theory of Operation

1. SECTION 4 OTHER OC COMPONENTS 4 1 KEYBOARD MOUSE 4 2 CRT DISPLAY x p eere atch Ba S iD hiv 4 3 1 NP NP AUDIO AMPLIFIER 1 4 4 PCI EXPANSION 4 5 ST 1800 SERIAL PORT EXTENSION BOX CT HISPEED SERIES THEORY OF OPERATION 2202124 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 ii OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 SECTION 1 GENERAL DESCRIPTION 1 1 OVERVIEW The information processing system operator console is based on the PCI Peripheral Component Interconnect bus architecture The host processor of the operator console is a Unix workstation which is on the market Workstation The physical hardware that contains the CPU and graphics boards a system disk and a power supply You connect it to a monitor keyboard and mouse to configure a working system The model type of this workstation is called O2 Illustration 1 1 shows a block diagram of the operator console of this CT system O2 System Software O2 System Software is the standard IRIX operating system software for the O2 and Silicon Graphics tools that come on the system disk and on the CD ROM that you use in the event of a system crash IRI
2. 1 1 1 1 OVERVIEW waj einer ERR E Ga d edu Dp eed x GA gta RT 1 1 SECTION 2 DETECTOR udana oi der x een d e x e et d ca 2 1 2 1 OVERVIEW I 2 1 2 2 SPECIFICATIONS Um Ron abuse Gd 2 1 2 3 HILIGHT DETECTOR MODULE 2 2 2 4 CHANNEL DISTRIBUTION 2 3 2 5 DAS DETECTOR CONNECTOR 2 4 2 6 QCALCHANNELS 31 ERIS bode TY Meth ULA a 2 5 2 4 ARTER GROW xi ble De ted p eh dieu s 2 5 2 8 HEATER AND TEMPERATURE CONTROL 2 6 SECTION 3 DATA ACQUISITION SYSTEM 0 3 1 3 1 OVERVIEW a its RIS Ep Ga HR REY A EPIS WE RE ELE 3 1 3 2 DATA FLOW 5 Ru dvb Or lane aA RP ERU RR e ae 3 5 3 3 CIE BOARD epo bp onde Sid obi 3 6 3 4 REPE dbep PUR EOS Gud be deed See dread us 3 8 3 5 DDP BOARD vbi 3 doe dts onde iran qur tone dus 3 10 3 6 DIRE BOARD cente aient otros Rubrica wryta ufum DR Rus CR EU RN AAA 3 11 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 ii D
3. from Host Processor 3 Lf gt Ole p Line OUT ded from Gantry Mic i i from OC o gt gt COS 4 Y i i to Patient Volume i L es A s D 070 a s RE V from Patient Volume aw i EA 1 cS E59 1 SR Auto Voice Volume V V E AB 151 5 E gt 2 gt 97 i i i V VV Scan Keyboard Volumes to Host Processor to Gantry to OC Speaker Line IN Speaker 3 5 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 3 2 REAR CN1 BOARD continued Audio Register Address Map Illustration 3 3 shows an address of audio control registers The addresses shown are mapped at an area within the DBPCI Input Output address space of the host processor Registers mapped within the I O register bases 50 7F are located on the DBPCI board These are controlled by the host processor and control signals only are sent from DBPCI to the REAR CN1 board Registers mapped within the I O register bases 80 FF are located on the REAR CN1 board These registers and the DBPCI board are connected via a dedicated bus Illustration 3 3 Audio Register Address Map D7 PIT1 Register 90 PITO Register 80 DO AUXO Note 60 Auto Voice Playback Register CD CD ROM Drive GA Gantry OC Operator Console AN Auto Voice pene Register PIT S
4. GAMASSY48 3 4 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 3 2 DATA FLOW The illustration 3 5 shows the data flow The Detector generates an electrical current proportional to X ray intensity The electrical current is converted to voltage signal in the CAM board The voltage signal is amplified to an appropriate level converted to digital data serial then converted to parallel data also in the CAM board The offset correction of the data is performed in the DDP board The data is then sent to to DTRE board where it is converted back to serial conditioned and then sent to Operator Console through the RF Slipring Illustration 3 5 DAS block diagram CAM board Signal PSA gnal Digital Conditioner Digital Parallel ectrica Analog Serial data data Serial Parallel DETECTOR Converter Conversion CAM control signal generator Timing Control CIF board Timing Control Digital DDP board Parallel data Offset Correction SLIP RING DTRE board FEC Parallel Serial L Encoder Conversion 3 5 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 3 3 CIF BOARD The CIF board performs the following functions e Interface exchange signals with to control and synchronize the data acquisition e Control signals g
5. The REAR CN1 board is connected to a slot of the connector box of the OC and as shown in Illustration 3 1 the board is connected to OC external components such are the keyboard TGP board on the gantry or the Power Dis tribution Unit PDU and is connected to OC internal components such are DBPCI board NAA1 board or others The board functionally consists of the following two blocks e Filter Block e Audio Mixer Block 3 2 1 Filter Block As shown in Illustration 3 1 this block includes the following interface circuits e Keyboard Interface Mainly interfaces between the keyboard including the scan buttons and the host processor e TGP Interface Mainly interfaces RS232 RS422 communications and Direct Lines between the TGP board located on the gantry and the host processor or keyboard e PDU Interface Mainly interfaces Power On Off Emergency Safety Loop or other signals between the Power Distribution Unit PDU and the keyboard or the FRONT PNL board of the OC 3 1 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 3 2 REAR CN1 BOARD continued Illustration 3 1 REAR CN1 Block Diagram Scan RS232 odis KB Reset M M RS232 Host Emergency Stop Rest Filter Block Processor Keyboard Direct Line M PS 2 Guard EA E from to Patient li El Auto Voice Foot Power On Front Expansion SW X
6. Image Storage 6000 images take up 3 GB 1 image 0 5 MB The remained 1 GB storage is used for System software swapping space Application software NPR NP NP Recon Engine This is a unit for performing high speed recon operations This unit consists of the following three kinds of circuit boards e NPRIF NPR Interface Performs interfaces between the PCI bus and the NPRM NPRM NPR Master Includes one master DSP Digital Signal Processor main memory called Global Memory 0 others e NPRS NPR Slave Includes two slave DSP s which perform arithmetic operations under the NPRM control The NPRS is a piggyback board equipped on the NPRM and up to eight NPRS boards can be equipped on the NPRM i e up to 16 slave DSP s can be equipped The NPRIF only is connected to a PCI slot The NPRIF and NPRM are connected by cables 1 3 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 1 2 MAIN COMPONENT DESCRIPTION continued DBPCI DAS Buffer for PCI Bus This is a circuit board serving as a ring buffer whose capacity is 4 MB This buffer temporarily stores DAS data This board also includes control registers for the OC keyboard safety loop others DASIFN DAS Interface for NP NP This is a circuit board which converts raw data sent from the gantry in optical serial signals into electric parallel signals During conversion this board performs transfer error corrections
7. Analog Bit3 PCI 080 Bit3 PCI Backplane Ultra Wide SCSI Host Card Controller 21 Color Internal Card NPRS Monitor System NB i Disk 2 2 A 1 2 2 A System Disk 2 22 22 Option Ultra Wide SCSI External NPRIF AHA 2940UW Keyboard PDU L ser Ultra Wide SCSI Laser Camera Camera Interface D DASM 5 w UJ Disk ST 1800 Serial R i A MI aw Data RS 232C Port Extension Box F1 Disk Option A Scan Room e Ka Gantry Mic Table Speaker P Includes Rear CN1 Board Rear CN2 Board VSPL Board ja and IST Board for SmartView 2 DASIFN Heart Gate E NE 1 NPRIF Recon Engine Interface Trigger NPRM Recon Engine Master gt NPRS Recon Engine Slave DBPCI DAS Buffer DASIFN DAS Interface 1 2 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 4 2202124 1 2 MAIN COMPONENT DESCRIPTION Host Processor The host computer performs all of the following operations User interface Image processings display all processings except recon Communication Database control Raw data image data flow control Image storage Scan recon control System Disk Ultra Wide SCSI within the Host Processor The host processor includes a hard disk drive which is used as the system disk This system disk mainly stores the followings System and application software Images Calibration files System parameters e Capacity 4 GB
8. connector Illustration 2 1 DETECTOR MODULE COLLIMATOR IN THE DETECTOR HOUSING LUMEX CRYSTAL 2 2 DAS DETECTOR GE MEDICAL SYSTEMS REV 5 2 4 CHANNEL DISTRIBUTION The illustration 2 2 and 2 3 shows the channel distribution Illustration 2 2 NP DETECTOR CHANNEL DISTRIBUTION 1 MODULE 16 Channels 49 MODULES 1 3 4 13 3 CHANNELS 14 806 8 CH 10 CH 793 CH QCAL REF ACTIVE Illustration 2 3 NP DETECTOR CHANNEL DISTRIBUTION 44 MODULES 1 3 4 13 NS 17 19 20 736 3 10 CH CH 3 717 QCAL REF ACTIVE CT HISPEED SERIES THEORY OF OPERATION 2202124 1 MODULE 16 Channels 807 816 10 CH REF 6 CHANNELS 2 3 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 2 5 DAS DETECTOR CONNECTOR The detector module consists of 16 channels The illustration 2 4 shows the flexible PWB that connects detector mod ules to the DAS CAM boards and its pin configuration Illustration 2 4 DAS DETECTOR CONNECTOR 24 FLEXIBLE CONNECTOR PWB 2 4 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 2 6 QCAL CHANNELS The X ray exposure can move along the Z axis It can be due to mechanical adjustment or to tube temperature the angle of the X ray output can vary according to the temperature There is three channels in the left most position
9. GHHdSIH LO CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 1 4 X RAY GENERATOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 SECTION 2 GENERAL DESCRIPTION II 2 1 INTRODUCTION Jedi is the engineering name for a family of compact high frequency X Ray generators This generator family covers a wide range of applications from mobile equipment up to vascular systems JEDI 12 25 kW Mobile applications JEDI 24 48 kW CT applications JEDI 32 50 kW RAD applications JEDI 50 65 80 kW RF applications JEDI 100 kW VASCULAR applications 2 2 STANDARD FEATURES Jedi is a family of 150 kV generators operating from 12 kW up to 100 kW for all the major radiological fluoroscopic and CT applications The family handles 1 ms to continuous exposures with tube currents ranging from OmA up to 1000 mA The generators feature the very latest technology available Constant potential independent of line voltage variations Power generation by a high frequency converter High voltage ripple 40 2 140 kHz Distributed micro processor controlled functions CAN bus Other features include e Single phase three phase or battery power source Very low kV and mA ripple excellent accuracies and dose reproducibility Compatible with a wide range of tubes high speed or low speed can supply up to 3 different tubes Thermal load interactive integrator ensuring o
10. IMS gt LOOK GUIDE 2 CRADLE DRIVER gt TABLE TOUCH SENSORS lt APERTURE SENSORS GANTRY TOUCH SENSORS SWITCHES 2 _ LATCH SWITCHES 1 2 TABLE GANTRY GE MEDICAL SYSTEMS REV 5 1 3 SPECIFICATIONS The specifications of the Table Gantry is as follows Gantry Rotation Speed 0 7 NP 0 8 1 1 5 2 3 sec rot Tilt Angle 30 0 5 Tilt Speed BWD 30 FWD 30 60 6 sec Table Height 400 950 mm UP Down Speed From 400 mm to 950 mm height 30 sec 5 sec 10 sec Cradle Speed Slow 20 mm sec Fast 100 mm sec Scout 75 mm sec Home 100 mm sec IMS Speed 50 mm sec 1 3 CT HISPEED SERIES THEORY OF OPERATION 2202124 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 1 4 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 SECTION 2 SUB ASSEMBLY DESCRIPTION 2 1 OVERVIEW The Table Gantry consists of table and Gantry The Gantry is divided into Stationary Gantry and Rotationary Gantry The communication between stationary and rotationary Gantry is made by slip ring a rotation mechanism that per mits electrical power and signals exchange The illustration 2 1 shows the Table Gantry block diagram Illustration 2 1 Table Gantry Block Diagram GANTRY PDU GANTRY OC DISPLAY TGP BOARD GANTRY COLLIMATOR SWITCH OGP BOARD POSITIONIN GANTRY
11. OC sends corresponding commands to Gantry processor Table processor and OGP board The main functions of the Management processor are e Communication with OC serial link e Communication with OGP serial link through slipring e IMS movement control e X ray ONLED on Gantry panel control e Positioning Light ON LED on Gantry panel control e Look guide control e Practice Switch for look guide control e Tilt position table height and cradle position adjustment There is a ROM connected to management proc essor that contains adjustment data The management processor reads this data compares with the cur rent positions and make adjustment as needed 2 10 TABLE GANTRY GE MEDICAL SYSTEMS REV 2 2 2 2 Processors continued Gantry Processor GP The Gantry processor control the following functions Positioning light switch Gantry rotation Table Processor TP The table processor control the following functions Cradle In Out Gantry Tilt Table Up Down Gantry Display Gantry Switch Interlock CT HISPEED SERIES THEORY OF OPERATION 2202124 TABLE GANTRY GE MEDICAL SYSTEMS REV 5 2 3 ROTATIONARY GANTRY The Illustration 2 8 shows the main components of the rotationary Gantry The functions of the parts of the stationary Gantry are as follows OGP Board The OGP On Gantry Processor performs the following functions Illustration 2 8 X ray exposure on off control DAS data trans
12. Scan Scan Parameter No of Scans for x ray tube Axial 2 0 sec 80 kV 80 mA Until the anode heat level reaches 5 0 warming Large Focus 1 mm Axial 2 0 sec 120 kV 100 mA Until the anode heat level reaches 13 096 Large Focus 1 mm Axial 2 0 sec 120 kV 200 mA Until the anode heat level reaches 48 096 Large Focus 1 mm for data collection Axial 50 FOV 1 0 sec 120 kV 1 200 mA Large Focus 10 mm Axial 25 FOV 3 0 sec 120 1 60 mA Large Focus 10 mm Axial 25 1 0 sec 120 1 60 mA Large Focus 10 mm The first three series of scans warm up the x ray tube During the last three scans data is collected to analyze it and update the CAL files The data is stored and whether the data falls within the specified range is checked If data is out of range the system reports a WARM UP ERROR If data is within range the system compares the data and the previous warm up data and calculates correction factors for the CAL files and updates the CAL files Illustration 3 1 shows the warm up scan sequence 3 1 SYSTEM GE MEDICAL SYSTEMS REV 1 3 1 WARM UP SCANS continued Illustration 3 1 Warm up Sequence Tube warm up scans Error Message Error amp Error code No Scans amp Data collection Data check Error Message Calculates correction factors CAL files correction CT HISPEED SERIES THEORY OF OPERATION 2202124 Raw Data Disk CAL
13. TILT OLIGHT SUB BOARD HYDRAULIC SYSTEM ERV DAS TABLE CRADLE IN OUT TABLE IMS D TOUCH SENSORS TABLE ELEVATION HYDRAULIC SYSTEM Only for NP 2 1 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 2 2 STATIONARY GANTRY The stationary Gantry is mainly controlled by the TGP Table Gantry Processor board The Illustration 2 2 shows the main components of the stationary Gantry The TGP board communicates with Operator Console and Table via cables and with the OGP board located in rota tionary Gantry via cable and slipring Illustration 2 2 Stationary Gantry main components OGP SLIPRING 4 MICROPHONE GANTRY SWITCH 115VAC PS1 DISPLAY BOARD EDU TOUCH SENSOR BOAR BREATH NAVI D PS3 EMERGENCY SWITCH E OC d TGP BOARD 4 MICROPHONE GANTRY SWITC TABLE lt H XDISP BOARD TOUCH SENSOR RCV BOAR BREATH NAVI D EMERGENCY SWITCH ale uec GANTRY TILT Rosz i PUMP amp VALVE TEBLE ELEVATION I 55 PUMP amp VALVE SIDE CO
14. This board also includes one channel for receiving Heart Gate Trigger inputs PCI Expansion Unit Consists of PCI Host Card PCI Backplane Controller Card PCI Backplane Card Increases the number of slots which are connected to the PCI bus of the host processor Circuit boards for scan recon are connected to these slots NPRIF DBPCI AHA 2940UW REAR CN1 This is a circuit board which mainly has two functions Signal filtering and Audio control This board is connected to OC external components such are keyboard TGP board on the gantry or Power Distribu tion Unit PDU and is also connected to OC internal components such DBPCI board NAA1 board or others Raw Data Disk Ultra Wide SCSI This is a high speed hard disk drive for storing raw data e Capacity 2 GB Raw Data Storage 450 raw data files 70 of the disk space is used for raw data storage 30 of it is not used because of low read write rate For NP the capacity is 4 GB Archive Equipment MOD MOD is used for archiving images raw data MOD is also used during system software installation to temporarily store data e Capacity 2 3 GB Density 4x Hitachi Sony MOD Images DICOM format Raw data YMS format as Unix files Includes Cal files others CD ROM Drive Used for system software loading 1 4 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 1 3 OPERATIONAL DESCRIPTION Scan Data Main Flo
15. also OC115 all turn OFF 2 7 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 2 2 DISTRIBUTION SEQUENCE continued Illustration 2 5 Power Distribution Sequence A B D FG H J KL M N close z open U U U U LI U close E OFF _ open Safety close LQOR open Reset close Emergency Pins 1 and 2 of JP1 are shorted on the RMT CNT board and the TGP board is at revision 4 or later has a cradle emergency deceleration function Note Safety Loop is always closed in normal conditions after the system is switched ON or reset this means that XG Power is always supplied to the gantry in normal conditions 2 8 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 2 2 POWER DISTRIBUTION SEQUENCE continued 2 2 2 Safety Loop Illustration 2 6 shows a diagram of the system safety loop As shown components on the gantry rotational block are not involved in the safety loop Illustration 2 6 Safety Loop Switch on the Gantry Rear Base RMIGNT jd SESS Board Operator Console Host Processor REAR CN1 Board som ri Sai NEC Sd 2 9 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 2 2 POWER DISTRIBUTION SEQUENCE continued Open of Safety Loop The safety loop can be opened by any of the following Switch equipped o
16. for power distribution to each function Input voltage to DC conversion AC DC function Low voltage power supply Application software running on the kV control board These functions are the Jedi core They are present in all versions of the generator A function can be unique for all products or can have several different releases based on product specification Examples The anode rotation function is available in 2 releases low speed rotation for applications where the tube has max rotation of 3000 rpm high speed low speed rotation for applications where at least one of the tubes can use 8000 10000 rpm The control bus is unique 2 4 2 Options Depending on the Application System Interface which be CT interface RAD interface console interface room interface AEC management present or not ATLAS interface EMC function e Grid function RF vascular e Bias function RF vascular Tube management 2 tubes or tubes option 2 3 X RAY GENERATOR YOLVYANAD AVH X JEDI GENERATOR FUNCTIONAL ARCHITECTURE System lt gt een conte Bus CDM heater supp Low Voltage Power kV Control Heater Rotation preload 1 phase 3 8 AC DC S 5 5 5 2 11 Tube S Management S RC 1 m m Nous p 55 Ig oltage 20 3 EMC Inverter 89 83 Filter ED EE 26 EC R Grid Bias X Ra
17. not sufficiently long for cooling down to the long term no load operating temperature EQUIPMENT not suitable for use in the presence of a FLAMMABLE ANESTHETIC MIXTURE WITH AIR or WITH OXYGEN or NITROUS OXIDE CLEANING ProSpeed S series system is NOT WATERPROOF It is NOT designed to protect internal components against the ingress of liquids Clean external system surfaces Gantry table consoles and accessories with a soft cloth dipped in hot water and wrung DAMP DRY NOT dripping IF NECESSARY use only mild dish washing liquid soap to re move dirt NOTICE Avoid damage to equipment Some spray and wipe cleaners etch and permanently cloud clear plastic surfaces Use only warm water and mild liquid soap to clean surfaces 4 GE Medical Systems GE Medical Systems Telex 3797371 P O Box 414 Milwaukee Wisconsin 53201 U S A Asia Pacific Latin America North America GE Medical Systems Europe Telex 698626 283 rue de la Mini re B P 34 78533 Buc Cedex France
18. ray On Shutdown Panel Unit Direct Line Board e Reset autos 2 Shutdown DBPCI Linee DBPC ik gt Deen from Patient toPatient AlertOn 511 CSA WRA Table Talk On m ACKA Fan Alarm Address 4 0 Emergency Stop Rest Audio Mix Data 7 0 Loop er Block A DT Power PowerOn from Patient External Speaker option Foot SW from Patient NAA1 ile Foot Switch E 1 1 Line IN CD Line OUT i CD ROM Drive 3 2 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 3 2 REAR CN1 BOARD continued 3 2 2 Audio Mixer Block The audio mixer block of the REAR CN1 board Includes registers for audio function and also includes an audio amplifi er for headphones or external speakers which are not the OC speaker which is driven by the NAA1 board See Illustration 3 2 As shown audio signals from several sources are mixed in this block e Audio Input Sources Microphone on the gantry Intercom From Patient Microphone on the OC keyboard Intercom To Patient Audio output on the host processor Auto Voice play Audio output on the CD ROM drive BGM or other Synthesized sounds on the REAR CN1 board X ray On Alert These are generated using a programmable timer which is controlled by software e Audio Output Destinations Speaker on
19. the TGP board 1 3 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 Illustration 1 1 System Block Diagram CAN Bus Control Bus Gantry Rotative Block X ray Generator Filament Board Low Voltage Rotor Board Power Unit Auxiliary Unit Power Supply Inverter Inverter High Voltage Tank Temperature Controller High Voltage Inverter Optical Fiber Coaxial Cable Slip Rings RF Receiver 22 Slip Rings Optical Gantry Stationary Block Fr OPERATOR AC115V ACII5V AC200V CONSOLE NERO PCI Bus Power Distribution Unit PDU Tabl Potentiometers for Hori 22 zontal Height IMS Host Connector Board Latch Switches System Cradle Encoder Seno A 2 Seno Feedback For systems equipped with Intermediate Intermediate Support IMS Support IMS only Position Feedback 1 4 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 1 4 SYSTEM SPECIFICATIONS AND DATA The following tables describe system specifications and data Table 1 2 Scan Time NP NP Option rns RE RECTUS M NIC ON gt i EJ see EF Half scan Table 1 3 Scan Recon Cal FOV FOV for NP cm FOV for NP and NP cm or for NP with 50 cm FOV Option Scan Recon FOV Cal FOV Scan Recon FOV Cal FOV Small 25 18 Sm
20. 0 V K1 XG Power Q O 2 1 a G GBI K21 F10 9 System 2 S Transformer 5 K2 TG200 0 0 0 0 i O K3 TG115 ae 0 0 SR115 LO O O 2 K4 OC115 0 0 0 0 CB6 Circuit Breakers P ON posui eme eae ere T CG FAN AL 2 From EE OC E OFF O RMT CNT iz Board TE prm 66 SAFE O o SAFE G a T The above means for example Gantry STEM When K6 is turned on then K3 E OFF G and K2 are turned on SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 2 1 POWER DISTRIBUTION UNIT PDU continued Illustration 2 4 Inside of PDU 200VPDU Mains 3 Phase 200 208 V K1 XG Power OR Q CB1 K21 F10 System O CB2 588 Transformer 5 Q m K2 TG200 lt gt 249 8 200 0 2 3 K3 TG115 115 o O C gt 9 lt 2 SR115 C 3 O 0 gt T K4 OC115 O_O E 0 CB1 CB6 Circuit Breakers P ON FAN AL From OC E OFF O RMT CNT SKM S Cas i m dam i n RST EM ok E SAFE O TE SAFE G et M From The above means for example Gantry JM When K6 is turned on then K3 E OFF G and K2 are turned on 2 6 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION
21. 2124 REV 2 3 4 CAM BOARD Continued Illustration 3 8 Control Logic FPGA block diagram MCLK RST shift resistor 1CLK uniti control CCLK 1 CAM control logic master signal for CAM control from CIF side 7bit data shift resistor shift resistor 2CLK 1CLK generator unit2 control master signal for CAM control to next CAM 7bit data ADTR1 ADTR2 SAMPLE for A D from A D Sdata serial data SCLK Busy output data to 9bit data to FPNR ranging data x 64 x 16 x 4 x 1 serial data SAMPLE 3 9 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 3 5 DDP BOARD The DDP board performs two functions Offset data correction and test patter generation Offset Correction The digital data coming from CAM board contains offset portion due to electronic circuitry and offset scan The illustration 3 9 shows a simplified block diagram of the offset cancel circuit in the DDP board The multiplex blocks MUX1 select inputs ports A or B according to the data type Port A or B is selected if the data is or active respectively These mltiplexer shift data by 4 bits Both offset and active data are 16 bits long When first offset data comes the multiplexers MUX2 select port B so that 0 is added by ALU Arithmetic Logic Unit to the offset data The result of this operation is then latched to the block LATCH in illustr
22. AL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 2 STATIONARY GANTRY continued Illustration 2 4 RCV Block Diagram RCV BD ASSY CN1 CN2 TGP 24V 5V GND SHIELD XLED PLLED DISP 0 A1 B0 B1 B2 B3 SLO SL1 SL2 E TGP BD ASSY 24V XLED PLLED XDISP 24V 5V SHIELD FLED SLED e ENN e aED D CUNTL2 CUNTL3 SE9 a Lb Lc Ld Le Lf Lg nm amp DRIVE Ha Hb Hc Hd He Hf Hq ASSY Lo CUNTHO CUNTH1 CIRCUIT CUNTH2 CUNTH3 FLED POSL INLMR RANGE PRACTICE 5VSW INR OUTR FAST EXLMR UPR DNR FWDR BWDR TEMP 5V 10 E OFF EMERGENCY olo Olo EMERGENCY SW TOUCH SW DETECT _ CIRCUIT MICOUT 2 4 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 2 STATIONARY GANTRY continued Display Board and XDISP board Display board is the display located at middle upper side of the Gantry front cover XDISP board is the smaller display located at middle upper side of the Gantry rear cover Gantry Switches Located at left and right of both front and at rear Gantry cover These switches are used to tilt manage Gantry tilt table and cradle movement and positioning light Gantry Microphone Located at upper portion of the entrance of the Gantry opening at the front and the rear side Touch Sensor Located at front and at rear upper side of the Gantry cover to protect patient during tilt When touch sensor at the front cover hit something during forward tilt t
23. AS DETECTOR CT HISPEED SERIES THEORY OF OPERATION 2202124 GE MEDICAL SYSTEMS REV 0 SECTION 1 GENERAL DESCRIPTION 1 1 OVERVIEW DAS Detector subsystem consists of Solid State Detector and Data Acquisition System DAS that are located on the rotationary Gantry X ray data acquired by the detector is converted to light then to electrical signal in the detector and then sent to DAS The DAS digitizes serializes and performs offset corrections on the signal and sends to the Operator Console for image reconstruction The X ray exposure through the scanning object is detected by these modules converted to light then converted to electrical signal and sent to to the DAS The DAS digitizes and sends this data by RF slipring and fiber optics to the Operator Console where it is processed for image reconstruction Illustration 1 1 X ray Exposure and Data Flow Block Diagram OBJECT X RAY d lt gt DATA DATA X RAY DETECTOR ACQUISITION DAS Data PROCESSING TUBE LL SYSTEM UNIT gt gt Illustration 1 2 X ray Exposure and DAS Detector X RAY TUBE X RAY BEAM DETECTOR DAS DAS DETECTOR 1 1 CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 1 2 DAS DETECTOR GE MEDICAL SYSTEMS REV 5 SECTION 2 DETECTOR 2 1 OVERVIEW CT HISPEED SERIES THEORY OF OPER
24. ASSY 415 CAM ASSY 14 CAM ASSY FLEXIBLE CABLE The DAS channels number is as follows KHW WA WZA Reference Channel 10 10 10 10 Ghanne Ground hamd 39356 3 1 DAS DETECTOR GE MEDICAL SYSTEMS REV 2 3 1 OVERVIEW continued The illustration 3 2 shows DAS block diagram CT HISPEED SERIES THEORY OF OPERATION 2202124 The data coming from the detector is taken by the CAM boards sequentially channel by channel digitized converted to parallel go through offset correction then sent to the Operator Console The CIF board is an interface with OGP On Gantry Processor receiving control and timing signals and generates the timing signals for data gathering The DDP board performs offset correction and generates the test pattern Illustration 3 2 DAS Detector Structure DETECTOR 51 50 49 48 447 4 3 2 1 DETECTOR J 1 1 hill MODULES IL Y Front End all all all BOARDS lall_ alle all Circuit for 16 F channels 5 5 5 5 515 515 515 5 5 DC 12V Analog DC 12V Analog 27 26 25 3 2 1 DC 5
25. ATE RESISTOR SIGNAL SLIP RING Illustration 2 9 Slip Ring Terminator The characteristic Impedance should be less than or equal to approx 509 2 14 TABLE GANTRY GE MEDICAL SYSTEMS REV 2 2 5 TABLE The Illustration 2 10 shows the main components of the table The description of the parts of the Table follows Table board CT HISPEED SERIES THEORY OF OPERATION 2202124 This is an interface board between board and servo amp stepping motor driver and table CONN board TBL CONN board This is an interface between Table board and potentiometers touch sensors and latch switches This board has only connectors For detail information see schematic diagrams Illustration 2 10 Table FROM SUB BOARD FROM TGP BOARD FROM HEIGHT POTENTIOMETER ONLY FOR NP PLUS VALVE GANTRY NF2 SW P S 9 5 TABLE UP DOWN POTENTIOMETER HYDRAULIC SERVO AMP w s SYSTEM SERVO MOTOR IMS 2 ENCODER 1 lt D l l TABLE gt M TABLE ES 3 BOARD CONN BOARD 5 6 2 421 LATCH SWITCHES O TOUCH SENSORS FOOT
26. ATION 2202124 The detector consists of housing collimator and detector modules The detector module is made of scintillator lumex crystal photo diode and connector When the X ray exposure is performed the X ray enters through the collimator and hits the scintillator The scintillator is made of a material that emits light when hit by X ray The scintillator is in contact with photo diode so that the light generated by X ray is converted into electrical current The generated cur rent is sent to the DAS Data Acquisition System to be processed 2 2 SPECIFICATIONS Distance from Focus to ISO 541 mm Distance from Focus to Detector surface 949 075 mm Detector Channel Pitch 1 15 mm Detector Channel angle 0 06946 degree View Number e Offset 64 views e Active 972 views Channel Distribution Ros gt ee 1 Active Channel 793 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 2 3 HILIGHT DETECTOR MODULE The module consists of Scintillator cells Collimator Photo Diode Reflex Films and Connector illustration 2 1 X ray enters through the collimator tungsten plates and is absorbed by the Scintillator Scintillator is made of Lumex Crystal the material that emits light when absorbs X ray radiation The Scintillator is optically coupled with Photo Diode which converts light to electrical current The Photo Diode is electrically connected to DAS through the
27. Continuous rotation type gantry with slip rings and high frequency coupling This CT system is comprised of the following main components called subsystems e Operator Console called OC e Scanning Gantry called gantry This subsystem further includes the following subsystems DAS Detector X ray Generator called XG e Patient Table called table e Power Distribution Unit called PDU The system may include some of the following customer option equipments e Advantage Windows Image Workstation e mage Camera 1 1 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 1 2 HARDWARE CONSTITUTION OF NP NP AND NP Product Code Name According to product models or customer options installed on the system a number of system specifications or func tions available may differ from system to system such are e Selectable scan times MA values FOV dimensions e Remote Tilt function e Number of detector active channels this difference results in image spatial resolution However the HiSpeed series scanners can be principally grouped into three for which the following code names are given respectively NP NP and NP In this Theory of Operation manual these code names NP NP and NP are used to describe differences among these three groups and to make descriptions of this manual read simpler Table 1 1 describes the constitution of the major hardware
28. ED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 ii X RAY GENERATOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 SECTION 1 GENERAL DESCRIPTION I 1 1 GLOSSARY Glossary of terms used in this document Term Definition ABC Automatic Brightness Control Regulation loop which makes the measured brightness equal to brightness demand AEC Automatic Exposure Control Exposure cut off technique which uses the brightness signal to cut the exposure CAN Controller Area Network A network used for localized control CPU Control Processor Unit Microprocessor and peripherals which run the software firmware EPLD Erasable Programmable Logic Device Electro Magnetic Compatibility The function prevents the generator from polluting the power source FPGA Field Programmable Gate Array It is programmed by the CPU core after the reset and handles all the exposure control logic including the system interface real time lines HV Ripple High voltage variations due to inverter current pulses Typically a few percent State Machine Software or hardware function which handles the state of a system and authorize to go to the next state upon reception of specific events IGBT Insulated gate bipolar transistor A type of power switch lip HV power inverter parallel resonant current current in the parallel inductor lir HV power inverter serial reso
29. ES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 3 4 CAMBOARD The CAM board performs the following functions e Conversion of electrical current signals from the detector to voltage signals e Signal level conditioning e Analog to Digital conversion e Serial to parallel digital data conversion e Generation of the timing signals for data gathering See Illustration 3 7 The signal from the detector with the level proportional to the X ray intensity is fed to the board The signal go through the electrical current to voltage signal conversion and conditioning circuits then is fed to the Analog Digital A D converter The A D converts analog signal to 16 bits digital serial data The serial data is then sent to the control logic and converted to parallel data The control logic also generates the timing for data gathering so that 1 channel data is taken at a time This part of circuit works synchronized with other CAM boards so that the data in entire DAS is taken a determined sequence Illustration 3 7 CAM board block diagram DETECTOR CAM ASSY DIGITAL ANA LOG SERIAL DATA m DATA Converter CHANNELS A D Converter HE 2 CONTROL LOGIC FPGA DIGITAL PARALLEL DATA TO DDP CONTROL SIGNALS FROM CIF 3 8 DAS DETECTOR CT HISPEED SERIES THEORY OF OPERATION GE MEDICAL SYSTEMS 220
30. GE Medical Systems Technical Publications 2202124 Revision 7 CT HiSpeed Series Theory of Operation Copyrighte 1998 1999 2000 by General Electric Company Operating Documentation GE MEDICAL SYSTEMS REV 0 WARNING AVERTISSEMENT WARNUNG AVISO CT HISPEED SERIES THEORY OF OPERATION 2202124 THIS SERVICE MANUAL IS AVAILABLE IN ENGLISH ONLY IF A CUSTOMER S SERVICE PROVIDER REQUIRES A LANGUAGE OTHER THAN ENGLISH IS THE CUSTOMER S RESPONSIBILITY TO PROVIDE TRANSLATION SERVICES DO NOT ATTEMPT TO SERVICE THE EQUIPMENT UNLESS THIS SERVICE MANUAL HAS BEEN CONSULTED AND IS UNDERSTOOD FAILURE TO HEED THIS WARNING MAY RESULT IN INJURY TO THE SERVICE PROVIDER OPERATOR OR PATIENT FROM ELECTRIC SHOCK MECHANICAL OR OTHER HAZARDS CE MANUEL DE MAINTENANCE N EST DISPONIBLE QU EN ANGLAIS SI LE TECHNICIEN DU CLIENT A BESOIN DE CE MANUEL DANS UNE AUTRE LANGUE QUE L ANGLAIS C EST AU CLIENT QU IL INCOMBE DE LE FAIRE TRADUIRE NE PAS TENTER D INTERVENTION SUR LES QUIPEMENTS TANT QUE LE MANUEL SERVICE N A PAS T CONSULT ET COMPRIS LE NON RESPECT DE CET AVERTISSEMENT PEUT ENTRA NER CHEZ LE TECHNICIEN L OP RATEUR OU LE PATIENT DES BLESSURES DUES DES DANGERS LECTRIQUES M CANIQUES OU AUTRES DIESES KUNDENDIENST HANDBUCH EXISTIERT NUR IN ENGLISCHER SPRACHE FALLS EIN FREMDER KUNDENDIENST EINE ANDERE SPRACHE BEN TIGT IST ES AUFGABE DES KUNDEN F R EINE ENTSPRECHENDE BERSETZUNG ZU S
31. ICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 1 5 SYSTEM OPTIONS Table 1 8 Main System Options for NP and NP Category Name Description Scan Recon High speed scan e Fast Scan 1 0 sec e Fast Scan 0 8 sec Large MA e Power Option 200 mA Power Option 250 mA Power Option 300 mA Power Option 350 mA Helical scan e 30 Slice Helical e 60 Slice Helical e 120 Slice Helical High speed recon Fast Recon 1 Speeds up recon time from 6 sec to 4 sec e Fast Recon 2 Speeds up recon time from 4 sec to 2 sec e Fast Recon 3 Speeds up recon time from 6 sec to 2 sec Storage Device Hard disk drive e Additional HDD for HDD image storage e Ext Raw Data Disk Additional HDD for raw data storage Main memory for 256 Host processor 512 MB Magnetic optical e MOD Additional Pioneer MOD disk drive MOD Filming Laser camera Analog interface Digital interface Network Ethernet e Advantage Windows Software e 3D Imaging e Denta Scan Navigator e Smart Helical Other option for e Foot switch for Inter Operator Console com Options for Gantry e Rear operation panel Front touch censor 1 8 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 1 5 SYSTEM OPTIONS continued Table 1 9 Main System Options for NP Category Name Description Storage Device Main memory for e 512 MB Host processor Magnetic optical e MOD Additional Pioneer MOD disk drive M
32. NAA1 block diagram 2 Aug 31 1998 ST 1800 description Generally updated DAS and XG Revised Table Gantry DAS Detector tabs eios Nov 27 1998 OC Vide signal specifications other 4 Feb 26 1999 Hard disk capacity Dress Oct 19 1999 Added information about NP HiSpeed ZX i 6 Dec 17 1999 Added a Jedi for NP block diagram TE Feb 25 2000 200VPDU note LIST OF EFFECTIVE PAGES PAGE REV PAGE PAGE REV PAGE REV PAGE REV Title page 7 2 1 erre obe 1 6 eoe blank 2 2 dei 5 Tab 6 X ray Genera Title page rear blank 2 2 to 2 3 2e ots nde ettam 0 2 3 to 2 11 2 tor atod 0 2 4 to 2 6 2 doxes 4 A NZ 5 1 Ausg 7 2 7 to 2 10 2 3 to 2 4 3 2 13 to 2 16 2 ISSN CEO blank dzy blank 3 1 to 3 2 3 110 3 2 5 1 1 to 1 2 1 ae tdt 1 3 3 22884568 3 810 3 6 0 13 ceste 6 ee kn HIT NE blank 3 4 to 3 5 4 1 1 Tab 5 DAS Detector 1 4 blank OO CE 4 210 4 3 0 ee ote 2 2 110 2 4 1 Tab 1 System 4 4 1 blank 2 5 to 2 7 5 rus 5 Tab 2 Operator Con TST 0 2 8 mska a Tei blank blank sole ZEE blank 3 1 sata away ta 1 dadas owad 0 ANA E Tab 3 Table Gantry DHA ia anew wi i 5 i oe
33. OD Filming Laser camera Analog interface e Digital interface Network Ethernet e Advantage Windows Software e 3D Imaging e Denta Scan Navigator e Smart Helical Other option for Foot switch for Inter Operator Console com Options for Gantry Rear operation panel Front touch censor 1 9 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 1 10 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 7 2202124 SECTION 2 POWER DISTRIBUTION 2 1 POWER DISTRIBUTION UNIT PDU The power distribution unit PDU provides powers to all the subsystems Two types of PDUs are available 400VPDU and 200VPDU Either one of two types is used according to the mains voltage main power from the power distribution box of sites 200VPDUs are used in Japan only See Illustration 2 1 400VPDU or 2 2 200VPDU These illustrations describe the following e All the powers except XG Power are output from the system transformer on the PDU 200VPDUs generate XG Power by a step up transformer e XG Power powers the x ray generator XG equipped on the gantry rotational block Powers for x ray tube high voltage x ray tube anode rotation XG control circuit boards etc are derived from this power However the fan and pump for the x ray tube are powered by SR115 e SR115 powers all the components equipped on the gantry rotational block except th
34. ORGEN VERSUCHEN SIE NICHT DAS GERAT ZU REPARIEREN BEVOR DIESES KUNDENDIENST HANDBUCH NICHT ZU RATE GEZOGEN UND VERSTANDEN WURDE WIRD DIESE WARNUNG NICHT BEACHTET SO KANN ES ZU VERLETZUNGEN DES KUNDENDIENSTTECHNIKERS DES BEDIENERS ODER DES PATIENTEN DURCH ELEKTRISCHE SCHLAGE MECHANISCHE ODER SONSTIGE GEFAHREN KOMMEN ESTE MANUAL DE SERVICIO S LO EXISTE EN INGL S SI ALG N PROVEEDOR DE SERVICIOS AJENO A GEMS SOLICITA UN IDIOMA QUE NO SEA EL INGLES ES RESPONSABILIDAD DEL CLIENTE OFRECER UN SERVICIO DE TRADUCCION NO SE DEBER DAR SERVICIO T CNICO AL EQUIPO SIN HABER CONSULTADO Y COMPRENDIDO ESTE MANUAL DE SERVICIO LA NO OBSERVANCIA DEL PRESENTE AVISO PUEDE DAR LUGAR A QUE EL PROVEEDOR DE SERVICIOS EL OPERADOR O EL PACIENTE SUFRAN LESIONES PROVOCADAS POR CAUSAS EL CTRICAS MEC NICAS O DE OTRA NATURALEZA GE MEDICAL SYSTEMS REV 0 ATENCAO AVVERTENZA CT HISPEED SERIES THEORY OF OPERATION 2202124 ESTE MANUAL DE ASSISTENCIA S SE ENCONTRA DISPONIVEL EM INGLES SE QUALQUER OUTRO SERVICO DE ASSIST NCIA T CNICA QUE A GEMS SOLICITAR ESTES MANUAIS NOUTRO IDIOMA DA RESPONSABILIDADE DO CLIENTE FORNECER OS SERVICOS DE TRADUCAO N O TENTE REPARAR O EQUIPAMENTO SEM TER CONSULTADO E COMPREENDIDO ESTE MANUAL DE ASSIST NCIA T CNICA O N O CUMPRIMENTO DESTE AVISO PODE POR EM PERIGO A SEGURANCA DO T CNICO OPERADOR OU PACIENTE DEVIDO A CHOQUES EL TRICOS MEC NICOS OU OUTRO
35. RES 1 1 1 2 HARDWARE CONSTITUTION OF NP NP AND 1 2 1 8 SYSTEM OVERVIEW UA l rS s 1 3 1 4 SYSTEM SPECIFICATIONS AND DATA 1 5 1 5 SYSTEM OPTIONS 23262 doce setae biceps EA 1 8 SECTION 2 POWER DISTRIBUTION 2 1 2 1 POWER DISTRIBUTION UNIT PDU 1 2 1 2 2 DISTRIBUTION 2 7 2 2 1 Power On Off Timing Chart 2 7 2 2 2 586 25555225 bie Dr e Pede edu etat oce eins 2 9 SECTION 3 SCAN OPERATION 3 1 3 1 WARM UP SCANS ies ue sese Ree LI YODA 3 1 3 2 JAAXIAL SCANS is sage ER Peer deb ge I ER eu Re 3 3 3 3 SGOULSCANS e T pi e ces 3 5 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 ii SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 SECTION 1 GENERAL DESCRIPTION 1 1 INTRODUCTION The features of this CT Computed Tomography system one of the HiSpeed series CT scanners include the follow ing Workstation type information processing system Solid state x ray intensity detector
36. REV 1 2202124 2 2 POWER DISTRIBUTION SEQUENCE 2 2 1 Power On Off Timing Chart The power on off controls of XG Power TG200 TG115 etc shown in Illustration 2 1 or 2 3 or 2 2 or 2 4 for 200VPDU are shown in Illustration 2 5 In the illustration E OFF turns close or open when either E OFF O or E OFF G turns close or open That Safety Loop turns close or open means the system safety loop is closed or opened including both SAFE O and SAFE G turns close or open See the Safety Loop description on page 2 10 Reset Emergency turns close or open when either RST EM or RST EMG turns close or open Illustration 2 5 describes the following e Timing B Only when Safety Loop turns close XG Power turns ON e Timing E When E OFF turns open XG Power TG200 and TG115 turn OFF however OC 115 remains ON If pins 1 and 2 of JP1 are shorted on the RMT CNT board and the TGP board is at revision 4 or later has a cradle emergency deceleration function TG200 and TG115 turn OFF 0 4 sec 0 5 sec later after E OFF turns open during this period the cradle is decelerated to a halt e Timing I When Reset Emergency turns open TG200 and TG115 are brought to ON e Timing J When AL turns open XG Power TG200 TG115 and
37. S IL PRESENTE MANUALE DI MANUTENZIONE E DISPONIBILE SOLTANTO IN INGLESE SE UN ADDETTO ALLA MANUTENZIONE ESTERNO ALLA GEMS RICHIEDE IL MANUALE IN UNA LINGUA DIVERSA IL CLIENTE E TENUTO A PROVVEDERE DIRETTAMENTE ALLA TRADUZIONE SI PROCEDA ALLA MANUTENZIONE DELL APPARECCHIATURA SOLO DOPO AVER CONSULTATO IL PRESENTE MANUALE ED AVERNE COMPRESO IL CONTENUTO NON TENERE CONTO DELLA PRESENTE AVVERTENZA POTREBBE FAR COMPIERE OPERAZIONI DA CUI DERIVINO LESIONI ALL ADDETTO ALLA MANUTENZIONE ALL UTILIZZATORE ED AL PAZIENTE FOLGORAZIONE ELETTRICA PER URTI MECCANICI OD ALTRI RISCHI COO PAV Say VIER LPS ECA GEMSUNCGH BRS LABS DRETI OOL ZETU VERSE RET IC UAT D D COCOS UEBA SU BESAD KEP 43031 015 21908 923 8 7 XOCK 2 ATE FAB 25 51 018 CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 IMPORTANT X RAY PROTECTION X ray equipment if not properly used may cause injury Accordingly the instructions herein contained should be thoroughly read and understood by everyone who will use the equipment before you attempt to place this equipment in operation The General Electric Company Medical Systems Group will be glad to
38. SWITCHES gi SPEAKER STEP ENCODER MOTOR CRADLE STEP MOTOR DRIVER ENCODER POTENTIOMETER 2 15 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 5 TABLE continued Foot Switches Pedals that controls Table Up Down When the Table is raised or lowered using foot switches there is no cradle com pensation Hydraulic System Consists of pump hose and cylinder it is used for Table Up Down Cradle Portion of the Table that executes longitudinal movement It is controlled by step motor and motor driver IMS Intermediate Support Mechanism that aids the longitudinal movement in order to improve scannable range It is controlled by Servo Amp and Motor This is only for NP Latch Switches Positioned at both right and left sides of the Table these switches release or latch the cradle When both switches pressed the cradle is latched When one of the switches is depressed the cradle is released They are for safety purpose Potentiometers There are three potentiometers IMS position potentiometer height potentiometer and Encoder tilt potentiometer They are used for feedback purpose Touch Sensors Located at under surface of the Table They are for safety purpose 2 16 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 TABLE OF CONTENTS SECTION PAGE SECTION 1 GENERAL
39. TION REV 3 2202124 2 1 OVERVIEW continued Table 2 1 Host Processor Specifications continued Component Specification Built in I O PC PS 2 compatible keyboard and mouse Input Output 2 x Ultra Fast Wide SCSI single ended 1 internal 1 external 40 MB sec each 2 x Serial 460 kbps DB 9 1284 Parallel C miniature 10BaseT 100BaseTX Ethernet standard RJ 45 Audio Analog stereo input output Expansion Slot One half length 64 bit PCI slot 10 W Operating System IRIX63 with XFS or later 2 3 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 3 2202124 2 2 BUILT IN I O INPUT OUTPUT DESCRIPTION The host processor has input output ports for the following Display Analog RGB signals are output from this port Keyboard Mouse A PS 2 keyboard and a mouse are connected these ports respectively 10BaseT 100BaseTX Ethernet A diagnostic console an independent console or an HIS RIS is connected to this port DICOM compatible the operator console can send push images to those devices using DICOM protocols at a 10 Mbits sec maximum the transfer speed varies according to receiver models the size of transfer data protocols etc Ultra Wide SCSI Internal This port is provided within the host processor The O2 host processor includes a hard disk drive This drive is used as the system disk and is connected to this port The disk is also used fo
40. V SUB BOARD ER SWITCHES AXIAL possum do 285 MOTOR FRONT AND gs o REAR Garber E CUN V AE COVER SWITCHES The functions of the parts of the stationary Gantry are as follows PS1 and PS2 Supply power to board and SUB board PS1 supplies 5V 12V and 12V PS2 supplies 24V 2 2 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 2 STATIONARY GANTRY continued FCV Front Cover Board RCV Rear Cover Board Contains conneciion circuitry to display board touch sensors breath navis and emergency switches See Illustration 2 3 and 2 4 Illustration 2 3 FCV Block Diagram BDASSY TGP 24V 5V GND SHIELD XLED PLLED 1 A0 A1 B0 B1 B2 B3 SL0O SL1 SL2 24V 5V SHIELD FLED SLED CUNTLO CUNTL1 CUNTL2 CUNTL3 7seg DECORD La Lb Lc Ld Le Lf Lg GNTDISP BD assy LG1 BD amp DRIVE Ha Hb Hc Hd He Hf Hg ASSY CUNTHO CUNTH1 CIRCUIT CUNTH2 CUNTH3 FLED CN3 LG2 BD ASSY LSW SHIELD FWDLED BWDLED EXLMLED IMSLED 5V y 5VSW LSW BD 9 7 c ASSY ER CN4 ola RSW EMERGENCY SW INR OUTR FAST IMSR INLMR EXLMR RAN RSW BD UPR DNR FWDR BWDR POSL PRACTICE ASSY c EMERGENCY EMERGENCY SW TOUCH SW KS DETECT CIRCUIT CN8 MICOUT 2 3 TABLE GANTRY CT HISPEED SERIES GE MEDIC
41. V CAM 4 POWER Gate Array Control Lee SUPPLY bs circuit for 2 Front End 1 i i i 1 1 DC 5V Digital Control Control Signal Signal from CIF BOARD OGP 1 Control Signal 16 Bit gt DDP BOARD le y y y y y y Data to lt DTR LBB ASSY 3 2 DAS DETECTOR CT HISPEED SERIES THEORY OF OPERATION GE MEDICAL SYSTEMS REV 2 2202124 OVERVIEW continued 3 1 DAS Power Connection Illustration 3 3 L A SSY NYO c ASSY WVO E A SSY PHASSV NYO S ASSY 9 A SSY WYO 4 55 8 A SSV 6 ASSY INVO LOENO LOENO lel 5 A_A_A_AJCOZNO ZOEND S OLZASSV WYO LL ASSY NYO 21 55 WYO LZASSV WYO VLEASSV SL ASSVNVO 9LiFASSV 218 55 WYO 8L ASSV WYO 02NO__ 0 NO 7 oo 2 6L A SSV WYO OZ A SSY LEHASSV NYO 20 55 INVO 55 VOS ASSV NYO 92 ASSV 9c ASSV WYO ZGHHASSV ASSY ASSY dlo SSV ddd ASSY 8H 2 S0SNO 9ZN S Acl OL 3SVO 9 ASLLOV DNIH AHLNVD H WOuS DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 3 1 OVERVIEW continued Illustration 3 4 DAS Signal Connection bal ASSV 490 ASSY dHLQ CBBASS Y CAMASSY 17 194140 RBBASSY CN201 LA
42. X Silicon Graphics s version of the UNIX operating system PCI Bus PCI stands for Peripheral Component Interconnect a bus specification The PCI bus is a high performance local bus used to connect peripherals to memory and a microprocessor A wide range of vendors make devices that plug into the PCI bus The PCI bus can be operated at its intended high performance by using DMA transfers To perform DMA transfers with the PCI bus a DMA controller should be equipped on the connected peripheral Address Map For a PCI bus based computer system memory address mapping and I O address mapping of PCI devices are deter mined during Configuration Cycle which the host processor generates when the system is powered on Each of the PCI devices requests its required address space size from the host processor during the cycle The PCI devices also such are DBPCI NPRIF others within this operator console are relocatable in the PCI address space This means that address mappings of the PCI devices are not fixed The physical addresses assigned by the host processor can be known by reading a set value on a base address register within configuration registers of each PCI device With a VME bus base addresses are determined by dip switches 1 1 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 Illustration 1 1 Operator Console Block Diagram HIS RIS Ethernet Host Processor
43. all 25 Small 25 Head 25 Small 25 Body Body 50 Large 50 Table 1 4 Image Spatial Resolution Related No of Actual Scan Views No of Detector Active Channels Recon Matrix Full Scan Half Scan 717 512 512 For 50 cm or 45 5 cm scan FOV The same type detector is used both for NP and NP the difference between the num bers of active channels is realized by soft ware 1 5 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 1 4 SYSTEM SPECIFICATIONS AND DATA continued Table 1 5 KV MA Stations KV MA Standard with 200 mA Option with 300 mA Option LF SF LF SF LF SF LF Large Focus SF Small Focus Note can also be set to any value that falls between the specified minimum and maximum values as listed above in 10 mA increments 1 6 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 1 4 SYSTEM SPECIFICATIONS AND DATA continued The system automatically selects Large Focus or Small Focus according to a slice thickness selection as described in Table 1 6 Table 1 6 Combination of Slice Thickness and Focus Size for Customer Slice Thickness mm Focus Size 1 2 Small Table 1 7 Other Specifications Exposure Start Angle Axial Scan Head 8 Posteriafossa Studies 90 270 deg Other Studies 0 180 deg 1 7 SYSTEM CT HISPEED SERIES GE MED
44. and provides four serial ports available The serial ports may be used for connection with an InSite modem a trackball etc 4 4 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 TABLE GANTRY TABLE OF CONTENTS SECTION PAGE SECTION 1 GENERAL 1 1 1 1 INTRODUCTION 3 54 2 3 Eni RP E TEN IS 1 1 1 2 COMPONENTS INTERCONNECTION 1 3 SPECIFICAT ON Le eese 1 3 SECTION 2 SUB ASSEMBLY DESCRIPTION 2 1 2 1 OVERVIEW lt lt oki n BOZE 2 1 2 2 STATIONARY GANTRY ete EIE 2 2 2 2 1 TGP board Service Switches 2 9 2 2 2 GP Processos ELI reip ea aie 2 10 2 3 ROTATIONARY GANTRY e eese 2 12 2 4 s SLIP RING EA zoom 2 14 2 4 1 5425 5528 eo eS ics 2 14 B25 2 dU sia 2 15 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 ii TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 SECTION 1 GENERAL DESCRIPTION 1 1 INTRODUCTION T
45. ank transformers in high voltage DC Disch board to discharge the recovered energy of the rotor and securities This box is present with non insulated stator tubes Performix on NP and Ebisu for example Optional Boxes selection e Grid Bias control 2 6 X RAY GENERATOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV5 2202124 Illustration 2 2 Jedi Generator Packaging Architecture Inverter Assembly LVPS Board for TIGER KV Control Board EMC Filter Optional POWER BOX AC DC BOX LVPS Board and Heater Board SYSTEM INTERFACE BOX Rotation Board FOR THE RAD PRODUCT Tube Grid Bias Selection Control Rotation Rotation Capacitor Capacitor X optional AUXILIARIES BOX OPTIONAL BOXES 2 7 X RAY GENERATOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 2 8 X RAY GENERATOR GE MEDICAL SYSTEMS REV 1 CT HISPEED SERIES THEORY OF OPERATION SECTION 3 TYPICAL SIGNALS 3 1 NP JEDI TYPICAL SIGNALS 2202124 The following table describes the main signals of the generator For each of them typical values are presented for the main applications Signal Application NP Values 36 kW max Qj tube Anode Rotation Phase P current during high speed run Phase A current during high speed run Filament Drive Inverter current in standby 2 5A Heater DC input voltage in s
46. assist and cooperate in placing this equipment in use Although this apparatus incorporates a high degree of protection against x radiation other than the useful beam no practical design of equipment can provide complete protection Nor can any practical design compel the operator to take adequate precautions to prevent the possibility of any persons carelessly exposing themselves or others to radiation It is important that everyone having anything to do with x radiation be properly trained and fully acquainted with the recommendations of the National Council on Radiation Protection and Measurements as published in NCRP Reports available from NCRP Publications 7910 Woodmont Avenue Room 1016 Bethesda Maryland 20814 and of the International Commission on Radiation Protection and take adequate steps to protect against injury The equipment is sold with the understanding that the General Electric Company Medical Systems Group its agents and representatives have no responsibility for injury or damage which may result from improper use of the equipment Various protective material and devices are available It is urged that such materials or devices be used 17 CERTIFIED ELECTRICAL CONTRACTOR STATEMENT All electrical installations that are preliminary to positioning of the equipment at the site prepared for the equipment shall be performed by licensed electrical contractors In addition electrical feeds into the Power Distribution Unit shal
47. ation 3 9 From the next offset data on the multiplexers MUX2 select input A so that the latched former result is added to new offset data this operation is repeated 16 times what leads to 20 bits data Only 16 most significant bits are taken which results in the average of the sum This data is taken as a subtraction factor for offset correction During normal scan operation the average of the offset data is subtracted from the active data in the ALU This data is then sent to a ROM for the purpose of data alteration Illustration 3 9 Offset correction circuit DATA FROM SPC function FPGA circuit DATA TO DTRF Test Pattern Generation The Test Pattern is for test purpose DAS data pattern test that checks the link between DDP board to DAS IFN board Operator Console 3 10 DAS DETECTOR GE MEDICAL SYSTEMS REV 2 3 6 DTRF BOARD CT HISPEED SERIES THEORY OF OPERATION The DTRF Data Transfer with Forward Error Correction executes the following functions e Error correction code generation e Parallel Serial conversion e View packing e Electric to light signal conversion Illustration 3 10 DTRF i FEC TAXI Optical DA En Transmitter Trans S coder P S conver sion OJ fiber optics RF Trans U 2202124 RF 1 Receiver fiber Of optics Error correction code is added for
48. checking the transmitted data at DASIFN assy in the Operator Console to assure data accuracy The optical transmitter converts the electric signal to light signal which is sent to RF transmitter by cable optics The RF transmitter sends the signal to RF receiver on the stationary gantry where the signal is again converted to light signal and sent to Operator Console by fiber optics For details about data communication error correction and other information refer to DASIFN in the Operator Console DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 3 12 DAS DETECTOR GE MEDICAL SYSTEMS REV 1 TABLE OF CONTENTS SECTION SECTION 1 GENERAL DESCRIPTION 1 1 1 GLOSSARY neue exe eR iene Sea ED en 1 2 JEDI HIGH LEVEL BLOCK DIAGRAM SECTION 2 GENERAL DESCRIPTION Il 2 1 INTRODUCTION i e Sheets REA D Re En 2 2 STANDARD 2 3 APPLICATIONS 2 4 ARCHITECTURE 2 4 1 A Kernel PROW RS 2 4 2 Options Depending on the Application 2 4 3 Packaging Architecture SECTION TYPICAL SIGNALS 3 1 NP JEDI TYPICAL SIGNALS CT HISPEED SERIES THEORY OF OPERATION 2202124 X RAY GENERATOR CT HISPE
49. d Illustration 3 2 Axial Scan Sequence Parameters Yes change Scan parameters setting KV MA Slice Thickness Scan Time Slice Interval No Cradle positioning Patient is moved into the gantry scan plane A The rotor is accelerated to operation speed acceleration Gantry is accelerated to the constant scan speed Offset data collection 64 views of offset DAS data are collected High Voltage ON Start x ray exposure Das enable DAS is enabled to collect data 972 views of actual DAS data are collected D llection T view period is synchronized with gantry azimuth position High Voltage OFF deceleration Next scan No End 3 4 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 3 3 SCOUT SCANS Prior to the actual x ray exposure the system collects 64 views of offset data generated from the DAS The offset data is used to correct actual x ray data The system advances the cradle and collects data from 793 or 717 for NP active channels The cradle speed is 75 mm sec and data collection timing is synchronized with the cradle encoder pulse Illustration 3 3 shows the scout scan sequence Illustration 3 3 Scout Scan Sequence Scan Z setting KV MA Scan Range Cradle positioning Cradle is moved to the Start 20 mm position Rotor start The roto
50. e x ray generator e G115 powers all the components equipped on the gantry stationary block except the axial motor The gantry tilt pump also is operated by this power TG115 also powers the table subsystem e TG200 powers the axial motor which rotates the gantry rotational block OC115 supplies power to the operator console 2 1 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 2 1 POWER DISTRIBUTION UNIT PDU continued Illustration 2 1 Power Distribution to Subsystems 400VPDU 1 X ray Generator Rotational Block Block 400VPDU To internal components TL Noise Filter Operator Console 2 2 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 2 1 POWER DISTRIBUTION UNIT PDU continued Illustration 2 2 Power Distribution to Subsystems 200VPDU X ray AC Generator 200 208 V Sys Rotational Block tem Trans former Block 200VPDU To internal components CB1 Noise Filter Operator Console 2 3 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 2 1 POWER DISTRIBUTION UNIT PDU continued Illustration 2 3 400VPDU or 2 4 200VPDU shows the simplified circuit diagram of the PDU As shown e 400VPDU The voltage of mains power should be within a range of 380 V 480 V The system transformer provides
51. ed detector module that is used for Z axis data correction In this module there is a wedge shaped lead block called Z WEDGE illustration 2 5 The outputs of the three channels are tied together so that only one data is taken for three channels The corresponding intensity according to the position of the X ray exposure along the Z axis is de tected as can be seen at right side of the illustration 2 5 so that the system recognizes the current X ray position along the Z axis There is a remaining data for Z axis data correction in the system Therefore the correction is made according to the data acquired by the Q CAL channels Illustration 2 5 Q CAL CHANNELS Z WEDGE X RAY INTENSITY DETECTED AC CORDING TO THE BEAM POSITION ALONG THE Z AXIS X RAY EXPOSURE 5 NIE Q CAL CHANNELS X GROUND CHANNEL 2 7 AFTER GROW The Lumex crystal scintillator has a property represented in the illustration 2 6 The scintillator continues emitting light even after the X ray radiation is stopped This phenomenon is called AFTER GROW This remaining scintillation pro vides incorrect data but the system performs the error correction to eliminate this portion Illustration 2 6 AFTER GROW X RAY ON 22 scintillation X RAY OFF 2 5 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 8 HEATER AND TEMPERATURE CONTROL The detector comprises a heater unit The heater keeps t
52. ed and Static brake activated MNL Manual Position When the switch is in this position the Gantry rotation is controlled OFF MNE manually by the other switches described below ABT Arbitrary Mode This switch is a spring loaded switch that enables Gantry rotation ABT toward the direction selected by the rotation Direction switch CNT HOME 90DEG by the fixed speed of XXX seconds per revolution e SVE Servo Enable Servo Amplifier is enabled and voltage command is 0 volts that FIX means there is no rotation at this position FIX Rotates Gantry according to the selection of the Speed Selection switches SPD2 SPD1 SPDO and FAST MID SLOW and Direction switch CNT HOME 90DEG 2 9 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 2 1 board Service Switches continued SPD2 FAST ol a These two switches sets the rotation speed d x See table below FASTIVIDSLOW FAST SLOW FAST mo SLOW FAST stow SPEED ero 07 19 15 2 3 5 1 9 1 5 CNT Clockwise rotation HOME Home position X ray tube at zero degree position 90DEG 90DEG 90 degree position X ray tube at 90 degree position 2 2 2 Processors board contains three processors Management Processor MP The Management Processor oversees the functions of the Table Gantry It communicates with and according to the message received from
53. ee blank 132 rece 5 Iliade nets nom tato ue 2 a 0 1 3to 1 4 0 blank 2 5 APPENDIX 5 121 0 2 410 2 5 0 1 to 4 0 1 6 to 1 7 0 Pe tee 1 2to 1 3 5 ais etti 2 1 8 to 1 9 5 1 4 1 4 blank 3 1 to 3 11 2 1 105 blank VHS 2 4 wywi A MERA 1 9 124 22 26 01 blank Blank Rear cover CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 GE MEDICAL SYSTEMS REV 1 CONTENTS CT HISPEED SERIES THEORY OF OPERATION 2202124 SYSTEM TAB 1 General Description Power Distribution Scan Operation OPERATOR CONSOLE TAB 2 General Description Host Processor Connector Boards Other OC Components TABLE GANTRY TAB 3 General Description Sub Assembly Description DAS DETECTOR TAB 4 General Description Detector Data Acquisition System DAS X RAY GENERATOR TAB 5 General Description I General Description II Typical Signals APPENDIX Symbols and Classification CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 SYSTEM TABLE OF CONTENTS SECTION PAGE SECTION 1 GENERAL 1 1 1 1 INTRODUCTION wa e wes dace Pe RP MP AR dr e
54. enerates control and timing signals to the other boards in the DAS for data acquisition OGP Interface The DAS subsystem receives scan control signals from OGP board by which the CIF board generates control signals for data acquisition The exchanged signals with OGP are shown in illustration 3 6 and the functions of the signals is as follows DTRIG DAS trigger This is the timing signal initiates for data acquisition AXAL X 16pulses view SCOUT 1ipulse view DENBL DAS enable indicates that the data is valid H data valid L data invalid SDCOM Serial Communication data from to CIF including signals ZERO DETECT and OVER RANGE DSCOM Serial Communication data from CIF to OGP including signals ZERO DETECT and OVER RANGE GPLS2 Home Position H home position L not in home position AC OF Signal to indicate if the scan is active or offset XRON Signal to indicate that X ray exposure is On RESET Reset signal for microprocessor in the DAS 3 6 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 3 3 CIF BOARD Continued Illustration 3 6 CIF board block diagram CLK Generator AZCLK CAM CLK 24 8832 MHz 32 0000 MHz CLK Generator ADCLK ome Lew oscow mev Processor conta citcuit ADTR3 data select circuit CAM data 3 7 DAS DETECTOR CT HISPEED SERI
55. fer timing Collimator control Positioning light control Scan control CTH THEORY ISPEED SERIES OF OPERATION 2202124 The automatic shut off of the Tube Fan Pump Power Supply after 30 minutes when the OC has been powered down Rotationary Gantry main components GPLS MOTOR E DRIVER MOTOR EE COLLIMATOR RING ENOCODER OGP BOARD POSITIONING 52 LIGHT FOR LASER PHOTOSENSOR POSITIONING LIGHT FOR ro HON HALOGEN TRANS RELAY FORMER SWITCHING SWITCHING POWER POWER SUPPLY 1 SUPPLY 2 TEMP CONT 115VAC ASSY TO DAS BUFFER RF XMT DTRF DAS DETECTOR TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 3 ROTATIONARY GANTRY continued Switching Power Supply 1 Supply power to the OGP board DTRF board RF transmitter and positioning light Switching Power Supply 2 Supply power to the DAS and Temperature Control Box Collimator Located at the exposure window of the X ray tube controls the aperture of the X ray beam by moving the blades The aperture can be 1 2 3 5 7 or10 mm Motor Driver Generates five phase pulses to control the s
56. files System Disk SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 3 2 SCANS Prior to the actual x ray exposure the system collects 64 views of offset data generated from the DAS The offset data is used to correct actual x ray data The system performs a full 360 deg scan clockwise direction only during 0 7 NP 0 8 1 0 1 5 2 0 or 3 0 sec These are called scan speeds or scan times and not all of the them are available to all the systems the available Scan speeds or times vary according to system models or options installed on the systems During a scan the system collects 972 views of data A view period differs according to the scan speed The following table shows this relation Scan Speed sec View Period usec view 0 7 720 0 8 823 1 0 1029 1 5 1543 2 0 2058 The view period is synchronized with the azimuth encoder pulse Axial scans are initiated from either 0 deg or 180 deg azimuth angle except for helical scans during helical scans scans can be initiated from any azimuth angle The system knows gantry azimuth position by azimuth encoder pulse counts and the Gantry Pulse which indicates that the gantry azimuth is at this moment at 0 deg i e home position Illustration 3 2 shows the axial scan sequence 3 3 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 3 2 AXIAL SCANS continue
57. he TGP Table Gantry Processor board is the main controller of the Table Gantry subsystem The TGP board re ceives command from the Operator Console and sends control commands to Table Stationary Gantry and Rotationa ry Gantry including OGP On Gantry Processor DAS and X ray Generator Although the DAS Detector and X ray Generator are in the Gantry they are not explained in this subsystem The Table Gangry consists of the following components e TGP board e OGP board e SUB board e Table board e Servo Amp Servo Motor e Gantry Display e Gantry Switch e Collimator e Positioning Light e Hydraulic System Gantry Tilt and Table elevation e Touch Sensors e Cradle drive system e IMS Intermediate Support 1 1 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 1 2 COMPONENTS INTERCONNECTION The illustration 1 1 shows the components of the Table Gantry Illustration 1 1 Table Gantry GANTRY GANTRY DISPLA SWITCH PANEL 4 TILT POTENTIOMETER gt _ AXIAL MOTOR HEIGHT TGP BOARD TILT HYDRAULIC POTENTIOMETER SYSTEM OGP BOARD IMS POTENTIOMETER gt APERTURE C B BOARD CRADLE POSITION RS POTENTIOMETER et gt MOTOR GEE Vo CRADLE ENCODER STEPPING MOTOR DRIVER OLENOID AZIMUTH ENCODER TABLE BOARD TABLE HY FOOT SWITCHES SERVO AMP FOR
58. he detector temperature constant what is needed for detector accuracy The heater is controlled by the Temperature Control Box which supplies power to the heater The detector also comprises a thermistor that feeds back the temperature information to the Temperature Control box Approximately three hours is needed after turning ON the power to the Temperature Control box to stabilize the detector temperature The temperature is controlled to 35 0 5 The illustration 2 7 shows its block diagram Illustration 2 7 TEMPERATURE CONTROL BLOCK DIAGRAM Thermistor DETECTOR Heater DC24V 60W INPUT POW ER 24V DC Driver for Heater PS PS AZ mxs OP Amp CPU de ROM Coparato TEMPERATURE CONT BOX 2 6 DAS DETECTOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 SECTION 3 DATA ACQUISITION SYSTEM DAS 3 1 OVERVIEW The DAS consists of the following boxes RBB Right Back Board CBB Center Back Board and LBB Left Back Board Each box contains the set of boards as follows e 9 boards e CBB 9 boards e LBB 9CAM boards 1 DDP board 1 CIF board The Illustration 3 1 shows the DAS boxes Illustration 3 1 DAS RBB CBB LBB LBB ASSY CBB ASSY RBB ASSY CONNECTOR TO DETECTOR CONTROL BOARDS 418 CAM ASSY 11 CAM ASSY 410 CAM ASSY 13 ASSY 12 CAM ASSY 417 CAM ASSY 16 CAM
59. he tilt stops When touch sensor at the rear cover hit something during back ward tilt the tilt stops Breath Navi Located at upper portion of the entrance of the Gantry opening at the front and the rear side to notify patient to breath hold breath and show remaining scan time Emergency Switch Located at left and right of both front and at rear Gantry cover SUB Board The SUB board contains control circuitry for Gantry tilt table elevation and servo amp for axial motor Control these functions according to the command received from TGP board Contains also connection to Gantry cover switches See Illustration 2 5 2 5 TABLE GANTRY CT HISPEED SERIES THEORY OF OPERATION GE MEDICAL SYSTEMS REV 2 2202124 2 2 STATIONARY GANTRY continued SUB Board Block Diagram Illustration 2 5 ATA TIO 4 491 JAWA LIL 89 22 quvos ans aya z IMS Jpoou3 991 01 sesjnd eposu d9LOPNTWAS 491 w01 JAS 491 LNOA OWHAHL MSHJAOO 51 491 818616 01H09 woi eseud ONASLL nad wo eseud OWA00e TABLE GANTRY 2 6 CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 2 STATIONARY GANTRY continued TGP BOARD There are three micro processors on the Board One controls the GANTRY Rotation
60. l be performed by licensed electrical contractors Other connections between pieces of electrical equipment calibrations and testing shall be performed by qualified GE Medical personnel The products involved and the accompanying electrical installations are highly sophisticated and special engineering competence is required In performing all electrical work on these products GE will use its own specially trained field engineers All of GE s electrical work on these products will comply with the requirements of the applicable electrical codes The purchaser of GE equipment shall only utilize qualified personnel i e GE s field engineers personnel of third party service companies with equivalent training or licensed electricians to perform electrical servicing on the equipment CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 DAMAGE IN TRANSPORTATION All packages should be closely examined at time of delivery If damage is apparent have notation damage in shipment written on all copies of the freight or express bill before delivery is accepted or signed for by a General Electric representative or a hospital receiving agent Whether noted or concealed damage MUST be reported to the carrier immediately upon discovery or in any event within 14 days after receipt and the contents and containers held for inspection by the carrier A transportation company will not pay a claim for damage if an inspection is no
61. n the gantry rear base Control by the TGP board The TGP board opens the safety loop in any of the following cases When the TGP board receives from the OGP board a safety loop open demand due to an overtime of x ray exposure When the TGP board detects abnormal communication with the OGP board or the operator con sole host processor during x ray exposure Control by the host processor i e system software The host processor opens the safety loop in any of the following cases When the host processor receives a safety loop open demand from the TGP board When the host processor detects an overtime of exposure When the host processor detects an extra scan other than scans which the host processor instructed the TGP board to perform performed Signals such are E OFF FAN AL etc 2 10 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 SECTION 3 SCAN OPERATION 3 1 WARM UP SCANS The system requires the Warm up scans to warm up the x ray tube just after power on and prior to starting the first scan or when more than three hours have elapsed since the last scan The warm up scans also have to be performed before performing phantom calibration which updates the calibration files CAL files if more than three hours have elapsed since the last scan The following scans are performed during the warm up scan sequence Table 3 1 Warm up Scans
62. nant current current in the serial inductor MOS Metal Oxide Semiconductor A type of power switch OGP On Gantry Processor Unit which drives the generator in CT systems PDU Power Distribution Unit RMS Root Mean Square 1 1 X RAY GENERATOR 8 1 YOLVYANAD AVH X JEDI GENERATOR Np FUNCTIONAL ARCHITECTURE System Interface Control Bus System Low Voltage Power Supply heater supply Rotation kV Control Heater lt mi 04 U09 19 I rotation phases safeties fans High Voltage High Voltage HV Cables Inverter Tank EMC Filter X Ray Tube 1 1 ph 3 phase power tube cooling input input 1 1 UONRE SNIJI jeuonoun 1 INVYSVIG 32018 THA41HDIH Id3f cL SIN31SAS TVOIG4W 35 velc0ce NOILVH3dO 40 AHO3HL S3lIH3S GHHdSIH LO 8 1 YOLVYANAD AVH X JEDI GENERATOR Np FUNCTIONAL ARCHITECTURE System Control Bus kV Control Heater bus a Bus 34 da l Rotation rotabion phases securities High Voltage High Voltage HV Cable High Voltage EMC Inverter Tank HEMIT Tank Filter HV X Ray Tube 1 3 phase power PSE tube cooling input input c uonensnyl 4 dN J01eJeuos 9 SIN31SAS 1V2IQ3N 35 120 NOILVH3dO 40 AHO3HL S3lIH3S
63. nt oy SRAM Azimut M Servo 1 Flash Rotate AMP me I Control 1 I Test 0 1 ER G Test 1 i Reset S 1 1 SW Slice Count Reset Status Patarn LED gt DAS Slip 1 gt Rin eie ee 5 I Management Com Processor 71 i Sli gt uPD78310 9600bp lip unica SIO Ring OC Direct CT Lock 1 I Line 5 gt Could brea Navi 584 Control 1 1 IMS E Lg ROG con i IMS Pot gt Table I TILT Pot Processor 12bit uPD78310 ADC Cradle Pot 1 radle M Control Rela Tilt I TT Cv Control 1T Rela PN Display 1 Gantry 1 Control Displa TGS Port Flash Add Con 2 8 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 2 1 board Service Switches There are five service switches at right upper side of the TGP board which are used to control the Gantry Rotation manually Illustration 2 7 TGP Board Service Switches ABT SPD2 FAST SYS 9121 9 10 1015 O 9 m z MNL FIX SPDO SLOW 90DEG TGP BOARD i 5 GANTRY LEFT SIDE SYS System Position When the switch is in this position the Gantry is controlled by the SYS Operator Console OFF Disable the Gantry rotation Servo Amplifier is disabl
64. of NP NP NP Table 1 1 Hardware Constitution Subsystem Component NP NP NP OC common Gantry Mechanics Position Halogen Lamps Laser ing Light Mechanics others common Electrics Firmware only is different Table IMS Standard or Option Standard Intermediate Support Others common DAS common Detector common Cast Lumex Generator common Jedi Gemini Jedi X ray Tube common MX165 modified EA Tube Gemini Tube 1 2 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 1 3 SYSTEM OVERVIEW Illustration 1 1 shows the system block diagram The operator console OC controls the entire system according to the operator s operations The OC sends instruc tions to the processor of the TGP board which then controls the gantry and table subsystems according to the instruc tions The TGP board processor also passes the OC instructions to the processor of the OGP board which is equipped on the gantry rotative frame The OGP board controls the DAS subsystem the collimator aperture or positioning lights according to the passed instructions The OGP board processor also passes the instructions from the TGP board to the processor of the x ray generator subsystem XG processor controls the x ray generator according to the instructions originally from the OC Reversely the OC receives status information from the TGP board or other processors via
65. om and the gantry room If communication of gantry room OC room is enabled the Auto Voice messages are doubled on the OC side which degrades the sounds Volume Control The following two kinds of volume control are provided e The following can be adjusted with the manual volumes the keyboard Volume of communication of OC room gantry room through the keyboard microphone Recording level of Auto Voice messages through the keyboard microphone Auto Voice volume in the gantry room Volume of communication of gantry room OC room through the gantry microphone e The electronic volumes are controlled by software controlling the following Auto Voice volume in the OC room Sound volume from the CD ROM drive both in the gantry room and the OC room Alert sounds in the OC room X ray On sound in the OC room 3 4 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 3 2 REAR CN1 BOARD continued Illustration 3 2 Audio Mixer Block Stereo Signal 07 0 Analog Switch from to DBPCI Monaural Signal X ray On Off b ooo ata Frequency 8 Alert On X ray Address 4 0 Programmable Modu mum gt gt gt lation 7 0 7 Alert pulse Alert Sound Syy I gt width controller shot 7 Electronic Volume Sound Volume to Electronic Control Register volume control gt from CD Drive
66. one controls the Table and the other controls the arbitration of commands from the gantry processor table processor scan processor lo cated on the OGP board and the OC See Illustration 2 6 e Processor A for GANTRY CONTROL GP e Processor B for TABLE CONTROL TP e Processor C for MANAGEMENT MP The Management processor communicates with the OC through serial links The other processors Gantry Processor and Table Processor communicate with the Management Processor and can receive commands from the OC via the Management Processor The Gantry Processor and Table Processor also contain a serial communication port which is not used for communication between OC or other Processors but rather is used for Data correction from the sensor switches The TGP Board issues commands to and receives status from the components it controls The TGP oversees the following functions e AXIAL Drive control e TILT Drive control e CRADLE IN OUT Drive control e IMS IN OUT Drive control e TABLE Elevation Drive control e GANTRY Display control e Breath Navi Display control e GANTRY panel switch Foot switch control e Error Detection 2 7 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 2 STATIONARY GANTRY continued Illustration 2 6 TGP Block Diagram PDU Emergency Rot Safe PDU Safety antry O Loop Processor O O uPD78310 L Rot Cou
67. ormation from those processors and devices e Controls the NPR NP Recon Engine e Performs graphics operations The host processor includes a DC power supply 175 watts it requires AC 115 V power 2 1 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 4 2202124 2 1 OVERVIEW continued Table 2 1 shows main specifications of the host processor Table 2 1 Host Processor Specifications 1 MB secondary cache Upgrade up to 256 MB with 16 Mbit SDRAM up to 1 GB with 64 Mbit SDRAM Hard Disk Drive Capacity 4 GB 5400 rpm System Disk Graphics Resolution 1280 x 1024 pixels 75 03 Hz Frame Rate 1024 x 768 800 x 600 640 x 480 also supported Frame Buffer Formats 32 32 bit FB 32 32 double buffered 32 bit FB 16 16 double buffered 16 bit FB 8 8 double buffered 8 bit overlay Video Signal Horizontal Statistics Horizontal Front Porch 118 52 nsec 16 pixels Horizontal Back Porch 1 84 usec 248 pixels Horizontal Sync 1 07 usec 144 pixels Horizontal Active 9 48 usec 1280 pixels Horizontal Line Rate 79 98 KLines sec First Field Statistics Vertical Front Porch 12 50usec 1 00 lines Vertical Back Porch 475 14 usec 38 00 lines Vertical Sync 37 51 usec 3 00 lines Vertical Active 12 80 msec 1024 00 lines Vertical Sync Pulse 38 58 3 09 lines Pixel Clock 135 00 MHz 2 2 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERA
68. ound Pulse Width Control X ray On Sound Register IO Register Base _ 50 3 On Sound Register 3 6 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 SECTION 4 OTHER OC COMPONENTS 4 1 KEYBOARD MOUSE The keyboard used for this operator console integrates the following components e 103 Keyboard Mouse This 103 keyboard and the mouse have a PS 2 interface for connecting themselves to the host processor e Scan Keys Microphone Keys used for scanning and a microphone used for an intercom are incorporated into the keyboard These keys are connected to the host processor via RS 232C The keyboard and the board are connected by Direct Lines for the remote cradle and gantry tilt control 4 2 CRT DISPLAY e 21 color monitor e The resolution used for the CRT Display is 1280 x 1024 matrix The refresh rate used is 75 Hz 4 3 1 NP NP AUDIO AMPLIFIER 1 This is an amplifier board for the OC speaker See the following block diagram Illustration 4 1 NAA1 Block Diagram Power Amplifier Preamplifier o A To OC Speaker CN2 gt From REAR 1 Muting Voltage Regulator 4 1 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 4 4 PCI EXPANSION UNIT The host processor only provides one PCI slot This unit expands this one slot to seven slots available This unit consists of the foll
69. owing three boards designed by Bit3 PCI Host Card PCI Backplane Controller Card PCI Backplane Card The main devices on these boards are PCI PCI Bridge chips which expand the number of slots in stages Illustration 4 2 shows a block diagram of the PCI Expansion Unit Table 4 1 describes installed circuit boards at those slots which are made available by the PCI Expansion Unit Table 4 1 PCI Slot Board se 5 29400 This is a SCSI card of Adaptec To this card up to two hard disk drives can be connected for on the fly high speed raw data storage 4 2 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 4 4 PCI EXPANSION UNIT continued Illustration 4 2 PCI Expansion Unit PCI Backplane PeFHOSECard Controller Card PCI Backplane Card PCI Bus PCI PCI I Bridge PCI Bus Host PCI PCI i Bridge A PCI Slot 1 PCI Slot 2 PCI Slot 3 PCI Bus PCI PCI Bridge Chip PCI Slot 4 PCI Slot 5 4 3 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 4 5 5 1800 SERIAL PORT EXTENSION BOX The host processor only provides two serial ports To increase the number of available serial ports the ST 1800 unit is used See Illustration 1 1 for the connection of the ST1800 unit within the operator console The unit is connected to the ultra wide SCSI port of the host processor
70. ptimum use of the heat protection curve of the x ray tube Available in various packaging configurations gantry under table cabinet e Serviceability high reliability fast installation no generator calibration application error codes ensure fast troubleshooting e Meets CE marking and in particular EMC IEC UL CSA MHW regulations if required e Optional pulsed fluoroscopy 2 1 X RAY GENERATOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 2 3 APPLICATIONS Surgery RF Vascular CT Cardiac 3 Points Mode 2 Points Mode 1 Point Mode 0 Point Mode Continuous Pulsed Fluorosco py Rad Exposures Cinema 30 fr s X Cinema 90 fr s x ABC X x Variable mA Scans x Legend X X X AEC Automatic Exposure Control Automatic Tomographic Exposure ABC Automatic Brightness Control in fluoroscopy 2 2 X RAY GENERATOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 1 2202124 2 4 ARCHITECTURE Refer to Illustration 2 1 Jedi Generator Functional Architecture The Jedi family is composed of 3 elements 2 4 1 Kernel High voltage chain composed of kV control HV power inverter HV tank Anode rotation function filaments heater function Control bus for communication between the functions DC bus
71. r is accelerated to operation speed Offset data collection 64 views of offset DAS data are collected Cradle acceleration Cradle is accelerated to the constant scan speed High Voltage ON Start x ray exposure Das enable DAS is enabled to collect data Actual DAS data are collected Data collection WARE P view period is synchronized with cradle position High Voltage OFF Cradle Stop Start Cradle position move start Cradle stop t t High DAS Voltage enable ON Data collection Cradle acceleration 3 5 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 3 6 SYSTEM GE MEDICAL SYSTEMS REV 3 TABLE OF CONTENTS SECTION SECTION 1 GENERAL 1 1 ux tbt eius Gad ba HI UI 1 2 MAIN COMPONENT 1 3 OPERATIONAL DESCRIPTION 2 5 5 2 1 2 2 BUILT IN I O INPUT OUTPUT DESCRIPTION SECTION 3 CONNECTOR BOARDS 3 1 CONNECTOR BOARDS 3 2 REAR GN1 BOARD au 2 edere eee 3 2 1 Filter Block tmt dh metis 3 2 2 Audio Mixer Block
72. r storing images Ultra Wide SCSI External Since this port is a wide SCSI the data bus of this port is 16 bit wide However within this OC devices which handle eight bit data such are CD ROM drive MOD drive or Camera Interface are connected to this port in daisy chain Serial Port RS 232C Provides two serial ports one is used for communication with the TGP board and the other is used for communication with scan keys on the keyboard Audio Provides audio input output ports The host processor can record audio signals from a microphone or other sources and can play recorded audio data This function is used for Autovoice PCI Bus Slot The host processor is equipped with one PCI slot In order to expand the PCI bus a PCI Host Card is connected to this slot The PCI Host Card is a component of the PCI Expansion Unit 2 4 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 SECTION 3 CONNECTOR BOARDS 3 1 CONNECTOR BOARDS All the signal cables connected between the operator console OC and subsystems components outside the OC run through these connector boards The connector boards mainly include filters for each signal line to improve the EMC Electro Magnetic Compatibility performance of the OC The REAR CN1 board also includes an audio mixer relay for the safety loop and others 3 2 REAR CN1 BOARD Illustration 3 1 shows a block diagram of the REAR CN1 board
73. t requested within this 14 day period Call Traffic and Transportation Milwaukee WI 414 827 3449 8 285 3449 immediately after damage is found At this time be ready to supply name of carrier delivery date consignee name freight or express bill number item damaged and extent of damage Complete instructions regarding claim procedure are found in Section S of the Policy amp Procedure Bulletins OMISSIONS amp ERRORS GE personnel please use the GEMS CQA Process to report all omissions errors and defects in this documentation Customers please contact your GE Sales or Service representatives CAUTION Do not use the following devices near this equipment Use of these devices near this equipment could cause this equipment to malfunction Devices not to be used near this equipment Devices which intrinsically transmit radio waves such as cellular phone radio transceiver mobile radio transmitter radio controlled toy etc Keep power to these devices turned off when near this equipment Medical staff in charge of this equipment is required to instruct technicians patients and other people who may be around this equipment to fully comply with the above regulation REV 7 CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION 2202124 REVISION HISTORY REV DATE PRIMARY REASON FOR CHANGE Mar 27 1998 d seges Jul 10 1998 Updated System option description Added 200VPDU Scan Operation
74. tandby kV Control DC bus measure at 400 VAC ILR at full power at 400 VAC 2 A peak 144 Hz 2 A peak 144 Hz 3 3 A peak 35 kHz 160V 560 V 500 A peak 50 kHz ILR at min power at 400 VAC 80 A peak 25 kHz ILP at full power at 400 VAC 150 A peak 50 kHz ILP at min power at 400 VAC 150 A peak 25 kHz X RAY GENERATOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 3 2 X RAY GENERATOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 APPENDIX A SYMBOLS AND CLASSIFICATION Publication Description 417 5032 Alternating Current Three phase Alternating Current Three phase Alternating Current with neutral con ductor Direct Current 417 5019 Protective Earth Ground 348 Attention consult ACCOMPANYING DOCUMENTS 417 5008 OFF Power disconnection from the mains 417 5007 ON Power connection to the mains Warning HIGH VOLTAGE Emergency Stop 1 CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 EMEN i D 417 5339 X ray Source Assembly Emitting Table Set Intercom on Operator Console Power On light on Standby light off EEK A 2 CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 Microphone Mic Brightness System storage prior to installation Maintain storage temperature between 10 and 60 C Sys
75. tem storage prior to installation Maintain non condensing storage humidity below 9596 DO NOT store system longer than 90 days m wiqu da gd I pvqys yqry ouy u r r System storage and shipment Maintain Air Pressure between 750 and 1060hPa f dba cbebt o A 3 CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 CLASS 1 EQUIPMENT Any permanently installed equipment containing operator or patient accessible surfaces must provide backup protec tion against electric shock in case the BASIC INSULATION fails In addition to BASIC INSULATION Class1 equip ment contains a direct connection to a PROTECTIVE EARTH CONDUCTOR which prevents shocks when a person touches a broken piece of equipment or touches two different equipment surfaces simultaneously TYPE B EQUIPMENT CLASS I II or Ill EQUIPMENT or EQUIPMENT with INTERNAL ELECTRICAL POWER SOURCES provide an ade quate degree of protection against electric shock arising from allowable LEAKAGE CURRENTS or a breakdown in the reliability of the protective earth connection ORDINARY EQUIPMENT Enclosed EQUIPMENT without protection against the ingress of water OPERATION Of EQUIPMENT CONTINUOUS OPERATION WITH INTERMITTENT LOADING Operation in which EQUIPMENT is connected continuously to the SUPPLY MAINS The stated permissible loading time is so short that the long term on load operating temperature is not attained The ensuing interval in loading is however
76. tepping motor of the collimator Receives pulse command from OGP board and convert it to other type of pulses Encoder Sends the feedback pulse to the OGP to show the moved amount of the blades Photo Sensor Detects when the collimator blades are in 1mm aperture DAS Data Acquisition System Processes the data received from detector and send it to operator console The detailed explanations are in the DAS Detector sections Temp Cont Assy Device that controls the Detector temperature DTRF Receives parallel data from DAS and convert them to serial data The detailed explanations are in the DAS Detector sections RF XMT Converts Serial signal from DTRF to RF signal GPLS Notify TGP and OGP board when the Gantry is at zero degree tube position 2 13 TABLE GANTRY CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 2 2202124 2 4 SLIP RING The SLIP RING transfers the following signals e DAS Data e DAS Trigger e TGP and OGP Communication message e Safety Loop 2 4 1 MECHANISM This Gantry slip ring system utilizes e Nine 480VAC power brushes 3 power lines x3 brushes e Four 115VAC power brushed 2 power lines x2 brushes e Three ground brushes 1 ground line x3 brushes e Twenty four signal brushes 6 signal lines x 4 brushes e HF transmitter receiver modules Every slip ring has a corresponding terminator located on the opposite side of the transmitter terminal See illustra tion 2 9 TERMIN
77. terminals for 380 V 400 V 480 V to connect power to the nearest voltage terminal e 200VPDU The system transformer provides terminals for 200 V and 208 V to connect power to the nearest voltage terminal e The SR115 output is not controlled by any relay contacts the power is always present in the CT system unless circuit breakers 2 or 5 are turned off e RMT CNT board contains relays which turn on off K5 6 K7 or K19 according to signals from the operator console and gantry e The relay K1 is turned on some delay time later after K21 is turned on The resisters connected to the relay K21 suppress rush currents Earlier PDU models have the following circuits between Mains and XG Power instead of the circuits shown in Illustration 2 3 or 2 4 The relay K20 is turned on some delay time later after K1 is turned on The resisters connected to the relay K20 suppress rush currents Mains K20 XG Power Se However the further earlier PDU models do not have K20 and connected resisters e Circuit breakers CB1 CB2 CB6 can turn OFF powers as written below 1 XG Power 2 TG200 TG115 SR115 115 CB3 TG200 CB4 TG115 CB5 SR115 CB6 OC115 2 4 SYSTEM CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 2 1 POWER DISTRIBUTION UNIT PDU continued Illustration 2 3 Inside of PDU 400VPDU Mains 3 Phase 380 48
78. the gantry Speaker on the OC Audio input on the host processor for recording Auto Voice messages 3 3 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 3 2 REAR CN1 BOARD continued Audio Input Switch As shown in Illustration 3 2 analog switches are used to switch audio input sources and are controlled by the On button on the keyboard or a foot switch connected to the keyboard e Anintercom function is provided between the OC room and the gantry room The Talk On button on the keyboard switches communication direction as described below While Talk On is pressed communication of OC room gantry room is enabled and both of Auto Voice both in the OC room and the gantry room and sound from the CD ROM drive both in the OC room and the gantry room are disabled While Talk On is released communication of gantry room OC room is enabled If a foot switch is provided this also serves as the Talk On button e The X ray On sound and alert sounds in the OC room are always enabled even when Talk On is pressed e Auto Voice messages can be recorded by using the microphone equipped on the keyboard while pressing the Talk On button While Auto Voice is being played communication of gantry room OC room can be disabled This prevents Auto Voice sound degradation on the OC side because Auto Voice is played both in the OC ro
79. w Illustration 1 2 shows Raw data acquired during scans is first buffered by DBPCI The raw data is then stored to a hard disk drive which is a high speed type and exclusively used for raw data storage The raw data is then transferred to the NPR where recon processing is performed The reconstructed images are then read by the host processor which converts the image data to video signal as well as stores the image data to the system disk which also stores system software As shown raw data and image data are mainly transferred over the PCI bus Illustration 1 2 Scan Data Main Flow CRT Display Video Signal Scan Raw Data PCI Bus Host Processor Raw Data Raw Data Disk Raw Data System Disk gt _ Image Data 1 5 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION blank 2202124 1 6 OPERATOR CONSOLE CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 0 2202124 SECTION 2 HOST PROCESSOR 2 1 OVERVIEW The host processor is a Unix workstation its product name is 2 The host processor is the central unit within the operator console performing various operations such are described below e Controls data transfer between data storage units and memory devices located on NPR etc e Controls the entire scan sequence it sends necessary instructions to relevant processors and devices and receives status inf
80. y Tube 1 X Ray Tube 2 Chiller 1 phase or 1 phase tube UNE S phase power cooling input input L 2 UONE SNIII SIN31SAS TVOIG4W 35 NOILVH3dO 40 AHO3HL 531935 Q33dsliH LO velc0ce CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 2 4 3 A Packaging Architecture The packaging architecture consists in a set of boxes which can be put together in several ways to make Jedi fit either in a cabinet or a console foot or a table foot The boxes can also be split in 2 units distant of several meters example CT gantry Refer to Illustration 2 2 The boxes normally consist of the following Auxiliaries Box e Rotation function Heater function Low voltage power supply which can also be in the AC DC box This box is always present Power Box HV tank HV power inverter kV control e System interface for the less complex system interface This box is always present AC DC Box MC filter optional e AC DC function Low voltage power supply which can also be in the auxiliaries box This box is always present System Interface Box RAD interface AEC interface This box is present in the RAD product 2 5 X RAY GENERATOR CT HISPEED SERIES GE MEDICAL SYSTEMS THEORY OF OPERATION REV 5 2202124 HEMIT High efficiency motor insulated transformer T

CT HiSpeed Series Theory of Operation

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