Project: virtual metal plate registration for orbital fracture

[chz31]

Draft Status

Ready - team will start page creating immediately

Category

Other

Presenter Location

Online

Key Investigators

• Chi Zhang, PhD (Texas A&M University School of Dentistry, USA)
• Andrew Read-Fuller, MD, DDS (Texas A&M University School of Dentistry, USA)
• Braedon Gunn (Texas A&M University School of Dentistry, USA)

Project Description

Orbital fracture usually involve large areas in the floor and medial wall of the orbit. During surgery, surgeons usually remove cracked floor and medial wall of the orbit and use the plate to reconstruct the orbit. Thus, we aim to develop a module for register 3D model of preformed metal plates to orbital fracture sites for surgical planning and measuring the adaptability of plates to patients. The registered plate should sit just above the unfractured bone of the orbit.

(MatrixORBITAL™ Preformed Orbital Plates)

Objective

1. Simulate the process of how surgeons would place the plate to fracture sites:

   • Plate can only rotate as it is fixed at the landmark "posterior stop, which marks the orbital process of the palatine bone. This area is usually preserved in orbital fracture cases and the most important landmark to screw the plate.

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   • Allow the plate sit above the unfractured area of the orbit rather than being superimposed with the orbit.

2. Interactive tool for fine tuning the plate registration, such as adding an interactive handler for the 3D model.

3. Automated segmentation of the fractured orbit as a future goal.

Approach and Plan

1. Using Fiducial Registration Wizard to do a pre-registration of the plate to the fractured orbit, then further registration the posterior stop landmark on the plate to the actual posterior stop on the orbit.
2. Improved registration based on only allow the plate to rotate around the posterior stop: select more surgical landmarks at the peripheral areas of the orbit and the plate. Register the plate again with it pivoted on the posterior stop.
3. Further refined registration to allow the plate to sit above the unfractured bone of the orbit.
4. Add an interactive handler for adjusting the plate manually.

Progress and Next Steps

1. Currently making the landmark set of the plate to allow it only rotates around the posterior stop until the squared error with the orbital landmark set is minimized.
2. The challenging is to further rotate the plate until it sits above the unfractures bone of the orbit.

Illustrations

No response

Background and References

Previous studies rely on commercial software BrainLab iPlan, and appears to be manual adjustment in a virtual environment: e.g., Schreurs et al. 2017: https://doi.org/10.1371/journal.pone.0150162

No response

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Project Page Pull Request Creation

:white_check_mark: COMPLETED: See https://github.com/NA-MIC/ProjectWeek/pull/884