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Development of a surgical planning software for drilling at the lateral skull base

: Gutbell, Ralf
: Becker, Meike

Darmstadt, 2011, 75 S.
Darmstadt, TU, Master Thesis, 2011
Master Thesis
Fraunhofer IGD ()
Operation planning; medical simulation; surgical planning; medical visualization; Forschungsgruppe Medical Computing (MECO)

Research in the field of minimally-invasive surgery is important, because it will allow surgeries at lower risk levels and will help to safe money and time as well. Several critical structures are located at the lateral skull base, so the minimally-invasive approach has not been performed in this area yet. Small errors in the drill placement could lead to severe complications for the patient.
In this thesis a prototype for multi-port planning is developed, which models the critical structures and considers the placement inaccuracy of the drill. It also allows the surgeon to determine the drill's size and a minimal distance to the critical structures, which the drill paths have to respect. A prototype has been developed, which employs and extends the medical simulation framework SOFA. New models have been created, describing the drill paths and collision components, enabling the collision detection and its visualization. Another feature of the prototype is the option of simulating the drill feed for a single drill path. The simulation models the drill and its movement from the entry point to the surgical target. This option allows the user assess the spatial relation between the instrument and the critical structures. The prototype's visualization features, its results and performance are analyzed for different drill settings, datasets and computer systems. The drill settings are combinations of drill sizes, minimal distance and drill placement inaccuracies. The evaluation shows that the created collision model has been successfully integrated in SOFA's collision pipeline. The implemented visualization features adequately represents the collisions and drill path parameters. The prototype's performance is limited and needs to be improved. Different solutions to achieve that and possible new features are presented.