Di2Mesh – Quick User Guide
Contents
1. s E Di2Mesh build Debug Di2Mesh exe s igma_err volume difference 59 8473 Distance error in mm Method 1 00 0 000 1 00 2 00 ore Direction A gt B xij ngei era ainan EDPS _ Select scalebar range as neal ee ee ashnan 2 t Load Surface ae Load Mesh l Load J Save a Clear Lower tresholdinmm 3 Higher threshold in mm gt bead Surface ae Load Mesh Load Save Clear i Z cubes Surface Normal y spherel Reference Vector z 0 0 J Calculate the Volume Difference Vector Sampling 1 Pre align Calculate Distance Data Display Export Images Exit We hope Di2Mesh will be useful for you If you use Di2MEsh for publications please acknowledge it as follow Hyungmin Kim Philipp Jurgens Stefan Weber Lutz Peter Nolte Mauricio Reyes A new soft tissue simulation strategy for cranio maxillofacial surgery using facial muscle template model Progress in Biophysics and Molecular Biology DOI 10 1016 j pbiomolbio 2010 09 004 Your comments and suggestions are very welcome mauricio reyes istb unibe ch S N tabiiiy FONDO NAZIONALE SVIZZERO n Swiss NATIONAL SCIENCE FOUNDATION2. Di2Mesh Quick User Guide e With Di2Mesh you can Measure surface to surface distances between two given surface meshes Pre align to correct the rigid displacements if any Visualize the distances with a colormap Visualize 3D direction of the distances Click and see to visualize local distance values Measure volume difference of two closed surfaces Export distances Images distance vector fields Di2Mesh u UNIVERSITAT BERN Method CPM Direction A gt B v Model Landmark Select scalebar range Model Landamark Load Surface Load Mesh Load Save Clear Lower thresholdinmm 2 Higher threshold in mm gt Load Surface Load Mesh Load Save Clear vi pre op sample Surface Normal v post op sample Reference Vector x Y N Calculate the Volume Difference Vector Sampling Pre align Calculate Distance T Data Display Export Images Exit Prior to calculate the displacement make sure that there is no rigid deformation due to the differences in the pre and post operative coordinate systems To align the frames first select the landmarks where the corresponding points should be fixed Then press the Pre align button shown in the figure Skip this step if the coordinate systems are the same or no rigid displacement has occurred during the registration process Di2Mesh CC b UNIVERSITAT BERN Method CPM Direction A gt B Model Landmark Sel
3. ace Nohmal Reference Vector x y Calculate the Volum C Vector Sampling Pre align Calculate Distanc Data Display Export Images Exit Click the button Calculate Distance A colormap will be generated and a file containing the coordinates of points and the distances will be written automatically in the setup directory as projected distance txt Di2Mesh ee EE Lole _x_ b u UNIVERSIT T BERN Distance error in mm Method 2 00 1 00 0 000 1 00 2 00 r CPM Direction a Model E l basmi i CI E e E oo nti a kartek B l N M SSF a REST z 7 AG ie 2 41 me L Load Surface Load Mesh p Load m Sawe Gear Lowerthresholdinmm 2 Higher threshold in mm LoadSurface luz LoadMesh load Save Gear IZ pop sample Surface Normal v post op sample Reference Vector x 1 0 y 0 0 Z 00 Calculate the Volume Difference Vector Sampling Pre align Calculate Distance Export Images Exit A Click amp See scheme allows the user to know specific distances by simply clicking the region of interest First make sure the button Data Display is active see figure below then press p on your keyboard while pointing over the surface to know the distance at that point The associated data is displayed and written as well in a list It can be saved ina separate text file To clear th
4. e selected points press the Clear button a Di2Mesh ca Sl b u h UNIVERSIT T BERN Distance error in mm 2 00 1 00 0 000 1 00 Monet nes abaan ae _ Select scalebar range ees _ pale aes ana fo L Load Surface Load Mesh toad Save lence wer threshold a mwa Higher threshold in mm gt bead Surface r LoadMesh Load Save Clear Distance error in mm J pre op sample Dist 2 23673 mm a Z post op sample 2 00 1 00 0 000 1 00 200 Dist_2 1 79776 mm Reference Vector T A Dist3 0 697798 mm Dist_4 0 305527 mm Calculate the Volume Difference Dist_5 0 809229 mm n Vector Sampling Dist_6 2 56586 mm Pre align Calculate Distance Data Display Export Images Exit Visualizing direction By clicking the right click button over a model name it is possible to display the distance error as vector fields as shown in the figure The vector fields can also be saved to a file E Di2Mesh Mode Landmark Load Surface Load Mesh Load Save Clear J pre op sample J gre op se mple_ vector fields Right click There is a checkbox for the volume difference measurement if this is checked the amount of volume difference is calculated after pressing the Calculate Distance and prints out in the command window To measure correctly this value the surfaces have to be closed B Di2Mesh
5. ect scalebar range Mode Landamark Load Surface Load Mesh Load Save Clear 1 Lower threshold in mm 2 Higher threshold in mm 2 C v pre op sample Surface Normal Reference Vector E 3 Pre align frames y z Calculate the Volume Differenc Vector Sampling 1 _Pre abon Calculate Distance Data Display Export Images Exit Di2Mesh u UNIVERSITAT BERN Method CPM Direction A gt B v Model Landmark Select scalebar range Load Surface Load Mesh Load Save Clear Lower threshold in mm 2 Higher threshold in mm 2 Gear V pre op sample Surface Normal zj Reference Vector x Y N Calculate the Volume Difference Vector Sampling i Pre align Calculate Distance Data Display Export Images Exit Methods Di2Mesh proposes 4 methods to compute distances In increasing degree of accuracy they are e MESH closest points on triangular meshes e CPM closest points between surfaces using a polynomial e CP CPM iterative procedure to find the CPM CPM of the final polynomial surfaces ICP CPM e TPS CPM Landmark assisted distance TPS CPM computation surface closest points Landmarks in the pre operative image represent the anatomical points that should correspond to those in the post operative model They are only needed when using the TPS CPM algorithm For the other methods MESH CPM there is no need for landmarks The TPS CPM has the highest accu
6. racy whereas the MESH method has the lowest one and gives results when the displacement is high However when the displacement is small the presented methods give close results Surface Normal uses the normal projection as the closest distance While the other types use anterior posterior AP projection and so on Selecting landmarks for TPS CPM To define landmarks first check that the button Landmark Selection is active see figure below then click on the 3D window to make it active and position the cursor where you want a landmark and press P on the keyboard You should see a sphere after this Specify pairs of corresponding landmarks at least three on the pre and post surface models aoma So ie Model Landmark Sel scalebar range Model Landamark Load Surface Load Mesh Load Save Clear Lower threshold in mm 2 Higher threshold in mm gt Load Surface Load Mesh Load Save Clear v pre op sample Landmark_1 Surface Normal v V post op sample Landmark_2 Reference Vector Landmark_3 Landmark_4 Calculate the Volume Difference Landmark_5 Vector Sam Landmark_6 sat Pre align Calculate Distance Export Images Exit Di2Mesh u i UNIVERSIT T BERN Method CPM v Direction A gt B v Model Landmark Model Landamark Select scalebar range Load Surface Load Mesh Load Save Clear A i Lanari Gurfare Laari Mach Lanari Cave Claar Lower threshold in mm 2 Higher J pre op sample Surf
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