Siddharth Posted October 22, 2016 Share Posted October 22, 2016 Hi, I will be attempting to make a clean 3D printable stl file from DIACOM data using slicer, blender and meshmixer. I wanted to know how do you validate the size of print file? For ex: If the skull will be used for surgical planning, how do you know that the print file and the actual skull are of the same size (1:1 ratio) Thank you in advance and many more queries coming Link to comment Share on other sites More sharing options...
Dr. Mike Posted October 25, 2016 Share Posted October 25, 2016 I would measure a structure on the source CT scan and then compare that to physical measurements on the printed model. That should give you and idea of any discrepancy in size. Link to comment Share on other sites More sharing options...
Siddharth Posted October 25, 2016 Author Share Posted October 25, 2016 5 hours ago, Dr. Mike said: I would measure a structure on the source CT scan and then compare that to physical measurements on the printed model. That should give you and idea of any discrepancy in size. Are you suggesting that I take measurements of the CT scan file? What do you mean by structure on the source file? My doubt is how do I know what the dimension of the part would be before I print it as they will be used for surgical planning and need to be accurate. My question might sound silly but I need clarity. Thank you in advance Link to comment Share on other sites More sharing options...
Dr. Mike Posted October 26, 2016 Share Posted October 26, 2016 I mean open the CT scan you originally made the file from and measure the size of your target structure using the tools in almost any clinically approved DICOM viewer. Then measure the same structure on your physical model. Bear in mind that you shouldn't be using your model exclusively for surgical planning. Any conclusions you derive from your testing with the model should be verified by looking again at the original scan. Structures can and do become lost or modified during the DICOM to STL conversion process. Good luck. Link to comment Share on other sites More sharing options...
Siddharth Posted October 26, 2016 Author Share Posted October 26, 2016 Thank you for the update. Will try the same and keep you posted. Thank you again. Link to comment Share on other sites More sharing options...
mikefazz Posted December 29, 2016 Share Posted December 29, 2016 I would add that voxel to real world dimensions come from the dicom tags 'pixel spacing' and 'slice spacing' which give the voxel dimentions. Only if one of these values (or other related ones) is incorrect will the dimensions of the resulting model be wrong. Also if printing make sure all software uses mm when importing the mesh. Link to comment Share on other sites More sharing options...
Dr. Mike Posted December 29, 2016 Share Posted December 29, 2016 Agree with Mike. Be careful about using mm for imports. If your model turns out to be the size of a house, chances are you used the wrong units! Link to comment Share on other sites More sharing options...
kopachini Posted December 29, 2016 Share Posted December 29, 2016 And watch out, in Blender 100m is 10 cm in real world so don't get confused. Link to comment Share on other sites More sharing options...
Siddharth Posted December 30, 2016 Author Share Posted December 30, 2016 Thank you for the guidance and support. I will experiment with the same and keep you posted. I also have queries regarding soft tissues and reconstruction can someone help me? Link to comment Share on other sites More sharing options...
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