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Toward Automating Patient-Specific Finite Element Model Development

Toward Automating Patient-Specific Finite Element Model Development. Nicole M. Grosland, Vincent A. Magnotta, Kiran H. Shivanna, Steve Pieper, Curt Lisle. Patient Specific Models.

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Toward Automating Patient-Specific Finite Element Model Development

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  1. Toward Automating Patient-Specific Finite Element Model Development Nicole M. Grosland, Vincent A. Magnotta, Kiran H. Shivanna, Steve Pieper, Curt Lisle

  2. Patient Specific Models • In order to bring FE to the “bedside” for guiding surgical procedures the technique must be unencumbered from the image segmentation and mesh generation process • Overcome the limitations associated with individualized, or patient-specific models

  3. June – Flood closes campus for two weeks with alternate working arrangements for an additional month Progress

  4. Progress • August – Completed meshing workflow and released a stand-alone application, IA-FEMesh, using the NA-MIC toolkit • October – Visit by Curt Lisle to work on integration of meshing workflow into Slicer3 • December – Meshing workflow integrated into Slicer3 trunk • January – Meshing tutorial presented at AHM

  5. Meshing Module IA-FEMesh Standalone application Slicer3 Integration

  6. Meshing Workflow

  7. Building Block Editing

  8. Mirror and Merging Blocks

  9. Mesh Quality Evaluation Summary Report

  10. Node/Element Set Selection

  11. Load / BC Verification

  12. Control over mesh density Mesh improvement Assignment of loads and boundary conditions Assignment of material properties Constant Image intensity Ability to create a uniform cartilage layer Export to ABAQUS Additional Features

  13. Mesh Comparisons

  14. Accuracy & Validity Studies

  15. Phalanx Bones and PIP Implant

  16. Carpal Bones and UTW2

  17. Mechanical Joint

  18. Brain Mesh

  19. Future Work • Mapped mesh extension • Mapping of building block structure to complicated geometries • Development of Slicer3 execution model • Evaluate for speed improvements • Refinement of Slicer3 Integration • Allow sharing of data between Slicer3 and meshing module • Improved integration of custom actors • Complete scene snapshot / restore • Module specific application settings • Add GUI tests using Squish • Further refinement of Slicer3 EM Segmentation tools for use with CT data • Test meshing module in the course “Applied Biomedical FE Modeling” offered at the University of Iowa

  20. Publications • DeVries NA, Gassman EE, Kallemeyn NA, Shivanna KH, Magnotta VA, Grosland NM., Validation of phalanx bone three-dimensional surface segmentation from computed tomography images using laser scanning, Skeletal Radiol. 2008 Jan;37(1):35-42. • Gassman EE, Powell SM, Kallemeyn NA, Devries NA, Shivanna KH, Magnotta VA, Ramme AJ, Adams BD, Grosland NM., Automated bony region identification using artificial neural networks: reliability and validation measurements. Skeletal Radiol. 2008 Apr;37(4):313-9. • Grosland NM, Bafna R, Magnotta VA., Automated hexahedral meshing of anatomic structures using deformable registration. Comput Methods Biomech Biomed Engin. 2008 Aug 7:1. [Epub ahead of print] • Ramme AJ, Devries N, Kallemyn NA, Magnotta VA, Grosland NM., Semi-automated Phalanx Bone Segmentation Using the Expectation Maximization Algorithm. J Digit Imaging. 2008 Sep 3. [Epub ahead of print] • Magnotta V, Li W, Grosland N. Comparison of Displacement-Based and Force-Based Mapped Meshing. Workshop on Computational Biomechanics for Medicine at MICCAI 2008. Insight Journal, http://hdl.handle.net/1926/1490 , 2008. • Grosland NM, Shivanna KH, Magnotta VA, Kallemeyn NA, DeVries NA, Tadepalli SC, Lisle C., IA-FEMesh: An open-source, interactive, multiblock approach to musculoskeletal finite element model development, Comput Methods Programs Biomed (in press).

  21. Acknowledgements • Grant funding NIH/NIBIB • R21 (EB001501) • R01 (EB005973) • Nicole Kallemeyn, Nicole DeVries, Esther Gassman, Ritesh Bafna, Srinivas Tadepalli, Austin Ramme, Wen Li, Dr. Brian Adams

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