creating medical prototypes from mri data

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Creating Medical Prototypes from MRI data Jillian Urban Mentor: John T. Tester, Ph.D. Mechanical Engineering

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Creating Medical Prototypes from MRI data. Jillian Urban Mentor: John T. Tester, Ph.D. Mechanical Engineering. Overview. Project introduction Materials Methods Results Discussion Conclusion. Project Definition. Matlab. Solidworks. Catalyst. - PowerPoint PPT Presentation

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Creating Medical Prototypes from MRI data

Jillian UrbanMentor: John T. Tester, Ph.D.Mechanical Engineering

Overview

Project introduction Materials Methods Results Discussion Conclusion

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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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Pixel-finding Method

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Pixel-finding Method

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Pixel-finding Method

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Pixel-finding Method

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Canny Edge-detection Method

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Canny Edge-detection Method

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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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Results

Meshed skull outer surface

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Results

Meshed jaw with outer and inner surface

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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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Questions

Special thanks to NAU NASA Space Grant Internship Program, Flagstaff Medical Center, and Dr. John Tester

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