TU CE GSC CE People at the Graduate School CE Alumni Patrick Charrier Research Project of Patrick Charrier

Development of Real-Time Methods for Interactive Surgical Simulation

Medical Simulation is a subfield of Computer Simulation. Its central applications are the training, planning, briefing and analysis of surgical, prescription and general medical practice. Because most Medical Simulations require simulation and visualization at interactive frame rates, fast methods from physically-based computer animation are widely used for the simulations.

My specific interest and longterm goal is to perform interactive surgery simulation directly on scanned computer tomography (CT) data. Interactive surgery simulation requires a wide range of complex operations like cuts and stitching to be performed in the simulation. The classical Lagrangian approach to this is to perform the simulation of a deformable solid such as an organ on a tetrahedralized mesh. Unfortunately this approach suffers from a number of problems in collision handling and cuts due to numerical instabilities and topology changes.

Since 2007 the simulation of deformable solids using an Eulerian approach became feasible. Instead of simulating on a tetrahedralized mesh, the simulation is performed on a regular grid. This specifically solves the problems of the Lagrangian approach named above to some extent. Unfortunately, operations with high spatial fidelity such as cuts are not easily applicable to the Eulerian method. The most important goal of my research is therefore to combine the best of both worlds, Lagrangian and Eulerian, in order to implement an interactive surgery simulation that is fast, stable and controllable.

Patrick Charrier

M.Sc.

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