CT - Measurement of the energy consumption
Contents
1. MEASUREMENT ceseeeeeeeeee tence teen een eee e eee e enna e ee eee eee eeeeeneeeenneeennanes 9 10 3 SCAN Mop ENERGY MEASUREMENT deene See Gate dege dog dg ege Z gege dro desi Gr gen 9 10 4 TRANSITION IDLE TO LOWPOWER MEASUREMENT sseeeeeeee eee eect eee eee eee e eee e neat ee en neenaeenae nas 9 10 5 TRANSITION LOWPOWER TO IDLE MEASUREMENT cccseeeeeeeee eee eeeeeeee eee neeeeeeeeeeneeeeneeennneeeenanes 9 11 ENERGY CONSUMPTION CALCULATION ccccceceeeeeeeceeeeeeeeeeaeeeeeeeeeuaeeaeeaeeeeeeeoneee 10 12 COCIR CT DATA COLLECTION SPREAD SHEET cccccscesceeeeeeeeeeeeeeeeeuaeeeeeeeeeeeeeeonees 10 CT Energy Measurement Revision 0 March 2013 COCIR 2 10 CT Measurement of energy consumption Revision VO Self Regulatory Initiative for Medical Imaging Equipment 1 INTRODUCTION The Energy related Products Ecodesign Directive 2009 125 CE enables the European Commission EC to set Ecodesign requirements through new regulations for any group of products which uses energy or is related to energy consumption In 2007 Medical Devices were identified as a Priority A product group by the European Commission for future regulation COCIR Companies presented in 2009 a Self regulatory Initiative for Medical Imaging Equipment driven by the Ecodesign Steering Committee committing to improve the environmental performances of their products As the Steering Committee has done for magnetic resonance a working group was f2. COCIR FOR MEDICAL IMAGING EQUIPMENT Revision O Date March 2013 Approved March 2013 COCIR HEALTHCARE European Coordination Committee of the Radiological Electromedical and Healthcare IT Industry COCIR Self Regulatory Initiative for Medical Imaging Equipment CT Measurement of energy consumption Revision VO COCIR TABLE OF CONTENT 1 INTRODUCTION kk ER KKK eee eeeeeeaseaeeaeeaeeeeeeeeeeeseaseaseaeeaeeaeeaeeeeaseaseaseaseaeeaeeanas 3 2 SCOPE wisn eesge ge iec cascade wdedededidecndenasededeerdededanndedamuaednesdedededsdsendadedeendws EEN KENE Seege deg 3 3 Idi bag tel ET 4 4 SYSTEM POWER MODES ccscceceeeeeeee eee eeeeeeeaeeeeeeeeeeeseaseaeeaeeeeeaeeeeeaeaseaseaseaeeeseaeeanas 5 5 USE MODES OVERVIEW cccccccccesceeeeeeeeeeeeeeeeaeeeuaeeaceaeeaseaeeaeeaseeseeeaaeageaseeeeaeeaeeaneanas 5 6 EXAMINATION DISTRIBUTION AND SCAN PROTOCOLS cccceeseeseeseeeeeeeeeeeeeeeeeaues 6 7 RESOURCES qu cccccsceeeeee ence ee ENER ER REENEN E KEE K ENER E RENE R seas eens ENER aaraa R ENER 6 8 UNIT UNDER TEST CUUTA enee ERR EE KEREN ENER ER ERR E EE K ER ER ENER ER REENEN KKK R ENER 6 9 POWER MEASUREMENT DEVICE cccceceeceeeeeeeeeeeeeeeeeeeeeaeeeeeeeeaeeauaaeaceaseeseaeeeeeaeeauas 7 10 MEASUREMENT OF POWER ERKENNEN ERR ERE ENER KKK RE RENE R ENEE ER ER E REENEN ERR EE KEREN EN 8 10 1 TRANSITION OFF TO IDLE AND IDLE POWER MEASUREMENT cccseeeeeee eect eee eeee tees eeeenaeeeaeenneeaes 8 10 2 TRANSITION IDLE TO OFF
3. al protocols 8 UNIT UNDER TEST UUT System Configuration System configuration should be recorded and configured to perform the set of specified procedures with appropriate mandatory equipment System Voltage The system should be installed according to the manufacturer s installation instructions at an input voltage of 380 415 VAC Installation The system shall be installed and calibrated according to its specification including all system critical items needed to perform a basic scan e g gantry x ray generator and tube reconstruction engine s required electronics such power supplies controllers console computer and patient table Any equipment and accessories beyond the basic product offering that is not required for a basic scan e g customer provided equipment optional Supplier equipment such as patient vital signs accessories hardware for advanced medical applications etc shall not be included in the measurement Environmental Conditions The measurements are to be taken at a steady state operating temperature within manufacturer s specified ambient temperature and humidity limits CT Energy Measurement Revision 0 March 2013 COCIR 6 10 CT Measurement of energy consumption Revision VO Self Regulatory Initiative for Medical Imaging Equipment Measurement Prior to each mode s measurement the equipment shall remain in that mode for sufficient time to allow temperature and other pertinent tran
4. e CT scanner is in Off mode for 12h during night time Etot Eoff Pidie x 20mins 20 x En Scenario Idle The CT scanner is in Idle mode for 12h during night time Etot Ejiate 12h Pidie X 20mins 20 x Ea Scenario Low The CT scanner is in LowPower mode during 12h night time Etot Etowpower Pidie X 20mins 20 x Eq Where Esp Eidie off Eoff idie Eide Energy in Idle mode over 12h night time E Eiowpower Eidte lowpower t Pidie S 12h Tidle low Tiow idie t Elowpower idle Pide Power in Idle mode 12 COCIR CT DATA COLLECTION SPREAD SHEET The data obtained according to the present methodology have to be filled in the appropriate template that can be downloaded from the COCIR website www cocir org for the calculation of the energy consumption in the different scenarios CT Energy Measurement Revision 0 March 2013 COCIR 10 10 AGFA amp E AL Science amp Humanity imaging HITACHI BOSCH Canon am 2 E EON FUJIFILM iSOFT An IBA Health Group Company orange A AGORRIA Belgium Inspire the Next HOLOGIC ba The Women s Health Company EDISON Microsoft ORACLE KONICA MINOLTA QuALcCownw E SHIMADZU 7 A ga wel E Solutions for Science S since 1875 e D TOSHIBA Leading Innovation gt gt gt EUCOMED PARTNER Hungary Italy TECNOLOGIA SANITARIA HEMA FIHTA Spain France Netherlands Finland Netherlands l TIP NGC I Medtech is ZN U a German
5. f protocols by only the Abdomen scan 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Type of examination A A A AlAlAlAlAlalalalalalalalalalalalal Total Duration min Setting up Scan Protocols Prepare the abdomen scan protocols provided by the CT scanner e g abdomen routine abdomen standard according to the user manual using the parameters defined in section 5 If it is not possible for the CT system under test to use a certain sequence or specified value use a sequence or value as close as possible to the sequence specified given the same diagnostic results The power measurement of different system states transitions etc described in the following sections shall finally allow to calculate the complete 24h power consumption according to figure 2 tebdomen standard Abdomen Scan energy of Scan s Ind Topogram Scout Spiral Scan Recon idle Je lowest power state lowest power state 35 min Figure 2 exemplary power usage of CT scanner for calculation of daily energy consumption The figure reports also variable idle power 10 1 TRANSITION OFF TO IDLE AND IDLE POWER MEASUREMENT 1 Shut the system to Off mode according to the user manual 2 Wait to ensure that all system elements have established a static Off power operation 3 Start the power measurement on the measurement device 4 Then switch on the CT system to idle according to the user manua
6. l The measurement device now records the complete transition from Off state to Idle state energy consumption of transition Off to Idle 5 Record Eorr idie Energy from Off to Idle kWh 6 Record total transition time Tote h 7 Record the power consumption in Idle state Idle power consumption in kW CT Energy Measurement Revision 0 March 2013 COCIR 8 10 CT Measurement of energy consumption Revision VO Self Regulatory Initiative for Medical Imaging Equipment 10 10 10 10 2 2 6 7 9 2 3 4 5 TRANSITION IDLE TO OFF MEASUREMENT Allow the system to stabilize in Idle mode then start the power measurement on the measurement device Shut the system to Off mode according to the user manual no energy consumption The measurement device now records the complete transition from Idle state to Off state energy consumption of transition Idle to Off Record Eigie ors Energy from Idle to Off kWh Record total transition time Tigie ore h SCAN MODE ENERGY MEASUREMENT Begin kWh datalogging at time T 0 Prescribe a patient and begin an abdomen exam according to Table 1 Exam Protocols Allow the exam to complete normally Let the system run until time T 35 minutes Record the total energy in kilowatt hours Record the scan energy E in kWh TRANSITION IDLE TO LOWPOWER MEASUREMENT Allow the system to stabilize in Idle mode then start the power measurement on the mea
7. ormed to determine a measurement methodology and ecodesign targets for computed tomography CT from manufacturers of these systems The outcome of the group was an agreed upon procedure for measuring typical energy consumption of CT equipment This procedure defines specific states of system operation and instructions for determining a set of scanning protocols to be analysed 2 SCOPE This methodology can be used to measure all CT systems Equipment and accessories beyond a basic CT product and not required for a basic scan or customer provided equipment such as optional reconstruction hardware patient vital signs accessories facility provided cooling equipment and hardware for advanced medical applications are outside the scope of this procedure It is not intended for use on interventional CT equipment The methodology is not suited for the measurement of technologies combining CT with other imaging modalities such as CT PET CT Energy Measurement Revision 0 March 2013 COCIR 3 10 CT Measurement of energy consumption Revision VO Self Regulatory Initiative for Medical Imaging Equipment 3 DEFINITIONS 12h day time time from 7 am to 7 pm 12h night time time from 7 pm to 7 am Energy The capacity to do work In this document the unit of energy is kilowatt hours kW h Power The rate at which energy is generated or consumed In this document the unit of power is kilowatts kW Procedure Type An examina
8. sient conditions to stabilize except when measuring transient conditions Off Low power to Idle and Idle to Off Low power Phantoms For the scan a 200 350mm water polypropylene phantom shall be used so that the spiral scan is not performed without any structure in the scan beam 9 POWER MEASUREMENT DEVICE The measurements shall be recorded using a device capable of measuring 3 phase voltage and current and calculating the integral of power with respect to time energy or a power meter able to sample average power ratings system paa equidistant 35 min el See IT Ti 20 patients per day Abdomen Routine scans 0 1 2 2 4 5 6 7 98 10 11 12 13 14 15 16 17 18 19 20 21 22 22 24 time Figure 1 Power usage of a CT scanner over 24 hours The level of the low power mode depends on the specific CT models and technology The power measurement device shall be installed onto the input to the AC Mains disconnect panel of the system to ensure that all energy consumption of the CT equipment is captured including any cooling equipment provided by the CT supplier as part of the base system CT Energy Measurement Revision 0 March 2013 COCIR 7 10 CT Measurement of energy consumption Revision VO Self Regulatory Initiative for Medical Imaging Equipment 10 MEASUREMENT OF POWER Trial executions of testing showed a further simplification of the test procedure is possible by approximating the range o
9. surement device Switch the system to LowPower mode according to the user manual After a static LowPower state is reached stop the power measurement on the power measurement device The measurement device now records the complete transition from Idle state to LowPower state energy consumption of transition Idle to LowPower Record Eidie lowpower kWh Record total transition time Tidie lowpower LA Record the power consumption in Idle state Idle power consumption in kW TRANSITION LOWPOWER TO IDLE MEASUREMENT Allow the system to stabilize in LowPower mode and then start the power measurement on the measurement device Switch the system to Idle mode according to the user manual After a static Idle state is reached stop the power measurement on the power measurement device The measurement device now records the complete transition from LowPower state to Idle state energy consumption of transition LowPower to Idle Record Elowpower idle kWh Record total transition time Tiowpower iaie h CT Energy Measurement Revision 0 March 2013 COCIR 9 10 Self Regulatory Initiative for Medical Imaging Equipment CT Measurement of energy consumption Revision VO 11 ENERGY CONSUMPTION CALCULATION The 24h energy consumption according to figure 2 has to be calculated out of the measured power and energy consumption of the different system states and transitions with the following formula for the 3 scenarios Scenario Off Th
10. tion To Method Off Low power Idle Operator starts system Idle Scan Operator starts a scan Scan Idle Scanning completes Idle Off Low Power Operator selection 5 USE MODES OVERVIEW Typical daily system operation is set as follows Time period Mode Duration 12h night time Off or Low Power 12 hours 12h day time Idle and Scan 12 hours The typical daily energy consumption of a CT system is the sum of the energy consumption for each of the two time periods CT Energy Measurement Revision 0 March 2013 COCIR 5 10 Self Regulatory Initiative for Medical Imaging Equipment CT Measurement of energy consumption Revision VO 6 EXAMINATION DISTRIBUTION AND SCAN PROTOCOLS Within each procedure type the specific scan parameters representing each exam type have been chosen to harmonize across manufacturers to general values as follows Table 1 Exam Protocols Scan type Head Chest Spine Abdomen Kv 120 120 120 140 120 mA 200 300 100 250 300 187 400 Rotation speed 0 5 1 0 5 1 0 5 0 8 CTDI Maximum 60 8 25 15 Scan Length mm 200 200 200 200 Reconstruction jobs 1 1 1 1 Tube current modulation ON ON ON ON 7 RESOURCES The following personnel are recommended e An engineer or technician familiar with the power distribution of the system and power electronics safety e An engineer or applications specialist familiar with scanner operation and the prescribing of clinic
11. tion is a collection of scans for an individual patient Procedure Type refers to an exam for a specific anatomy or type of exam e g Abdomen or Vascular Off The system is shut down AC mains off according to the user manual The system consumes no energy Low power The system functions into the minimum energy consumption state that the user can select according to the user manual Idle mode A state of the system when fully powered but no scan has been prescribed This mode does NOT include x ray tube rotor or gantry rotation Scan mode A state of the system between individual scans and during scans e g during patient handling examination planning contrast agent injection and active scanning with x ray generation This mode includes tube rotor rotation gantry rotation and generation of image and any possible idle between scans CT Energy Measurement Revision 0 March 2013 COCIR 4 10 Self Regulatory Initiative for Medical Imaging Equipment CT Measurement of energy consumption Revision VO 4 SYSTEM POWER MODES The operation modes are defined as Off Low power Idle and Scan The energy consumption differs between the modes and the transition between modes occurs by operator selection The anticipated power of these modes from high to low is Scan gt Idle gt Low power gt Off The table below shows a possible state transition order for a CT system Initial State Transi
12. y Turkey Germany Self regulatory Initiative for medical imaging equipment Copyright 2011 COCIR All Rights Reserved All material in this document is unless otherwise stated the property of COCIR Copyright and other intellectual property laws protect these materials Reproduction or retransmission of the materials in whole or in part in any manner without the prior written consent of the copyright holder is an infringement of copyright law
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