Major contributions

Current related projects

* Model based computer assisted surgery for Deep Brain Stimulation
* Cochlear Implants

Major contributions

Our major objective within this application domain was to correct for brain deformations that occur during surgery. Neuronavigation systems make it now possible to superimpose preoperative images with the surgical field under the assumption of a rigid transformation. Nevertheless, non-rigid brain deformations, as well as brain resection, drastically limit the efficiency of such systems. The major objective here was to study and estimate brain deformations using 3D ultrasound and video information. This was performed through the integration of intraoperative 3D free-hand ultrasound and 3D intraoperative video reconstruction. The major advances in the period was to propose 1) a new 3D reconstruction framework for 3D freehand ultrasound from regular B-scans, 2) a new denoising scheme based on the adaptation of NL-Means to the Rayleigh distribution model, 3) a new rigid and non-rigid registration framework which includes a new probabilistic similarity function between MRI and Ultrasound images, and 4) a new detection, quantification and tracking of surface brain deformations from videos of the binocular microscope. We have demonstrated that millimeter deformations can be measured and corrected; with an accuracy limited to the patient to physical space registration error mainly.

Current related projects

* IGNS