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Orbital fracture surgery simulation using SlicerSOFA

Key Investigators

Chi Zhang (Texas A&M University College of Dentistry, USA)
Rafael Palomar (NTNU / OUH, Norway)
Paul Baksic (INRIA, France)
Steve Pieper (Isomics Inc., USA)

Project Description

Using SlicerSOFA to simulate orbital fracture repair using titanium plate.

Virtual planning in oral and maxillofacial surgery (OMFS) is primary based on static models using proprietary software for implant customization design and surgical navigation. Soft tissue behaviors were usally unknown. However, physics simulation has not been widely adopted in OMFS virtual planning. One reason is simulation is complex. SlicerSOFA can bridge this gap by integration Slicer and SOFA.

Image source

Objective

Create a demo scene for future development and gathering feedback from surgeons
Plan for a grant proposal resubmission.

Approach and Plan

Work on two separate scenes:

1. Soft tissue retraction:

Goal: move the retractor to create a gap sufficient to insert the plate
Challenges: collision in a confined space; proper mechanical models of different tissue types
Creating a single multi-material model

2. Plate bending and fixation

Meshed plate is geometrically complicated; using shell model as a proxy

3. Run a demo scene in SlicerSOFA

How to integrate Slicer methods to facilitate mechanical model preparation and interaction, such as controller
Demo scene “tap the eyeball”

4. Planning for benchmarking and validation: what is considered as “success” at this stage?

Progress and Next Steps

Multimaterial model

Create a union model of orbital soft tissue and convert into a tetrahedron mesh.
Using the SOFA ‘MeshROI’ method to use the eyeball-musle polygon model as an ROI to select tetrahedra fell within it, and assign different materials to tets in and out the ROI (i.e., orbital fat).

Using SlicerSOFA infrastructure and vtkProbeFilter() & grid transform for mesh & image deformation

Next step: work on the collision model issue between the retractor and the soft tissue

Illustrations

No response

Background and References

Orbital fracture repair introduction: AO Surgery Reference - Orbital Floor Reconstruction