Date post: | 31-Dec-2015 |
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Creating Medical Prototypes from MRI data
Jillian UrbanMentor: John T. Tester, Ph.D.Mechanical Engineering
Project Definition
Reproduce medical prototyping process with the use of basic software tools typically used in an undergraduate mechanical engineering program
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Matlab
Solidworks
Catalyst
Materials
Image files from MRI Sequenced image files of human anatomy MRI compiled in AVI format
Dimension SST 768 Prototyping machine ABS plastic (and support material)
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Why incorporate the two?
MRI compiled to AVI original MRI format is
proprietary AVI universal format portable for medical
personnel Create solid model of
anatomy
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Point cloud to STL
Arrange pixels in x-, y-, and z- coordinates
Stack the images for 3D
Point cloud to mesh using Scanto3D
STL file created for Rapid Prototyping
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Discussion
Pixel Detection Advantages
Outer layer Small features
Disadvantages Not sufficient for
production of inner and outer layers combined
I.E., SHELLS
Canny Advantages
Noise reduction Production of shell
structures in CAD Accurate cavity bone
location Disadvantages
More smoothing for precise meshing
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Discussion
Scanto3D Advantages
Mesh creation from point cloud
STL creation Disadvantages
Inaccurate meshing of interior complex bone cavities
Less control of surface creation
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Conclusion
Three-step method of processing AVI files Most complex bone structure: the skull Lessons learned
Scanto3D meshing sufficient for external surface meshing of a solid form
Small medical practices can produce solid models of simple bone structures using conventional computer engineering tools
Need more work for complex bone shell-type structures
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