Stereo-Guided Volumetric Deformation Recovery
We have developed a framework for soft tissue deformation recovery [1,2,3]. The core of the approach is a volumetric deformable model based on the biomechanics of the material. Often, e.g. in medical applications, the deformation is very complex and dependent on may factors. In such cases, in order to reliably estimate the deformation, the model has to be guided by the available, typically limited, data. We proposed the use of stereo cameras for guidance, where the reconstructed surface is used as a boundary condition for the partial differential equations that define the model. Fig. 1 and 2 illustrate the concept in 2D.
We applied the approach to the problem of brain shift, i.e. brain deformation that occurs during the surgery. Fig. 3 shows stereo views of an exposed brain surface and its reconstructed surface mesh, while Fig. 4 shows 3D simulation results. A partial validation using intraoperative magnetic resonance images suggests that the error introduced by the brain shift can be reduced almost to the image resolution.
 Skrinjar, O., Nabavi, A., and Duncan, J., "A Stereo-Guided Biomechanical Model for Volumetric Deformation Analysis", IEEE Workshop on Mathematical Methods in Biomedical Image Analysis, Kauai, HI, USA, pp. 95-102, December 2001. LINK
 Skrinjar, O., Studholme, C., Nabavi, A., and Duncan, J., "Steps Toward a Stereo-Camera-Guided Biomechanical Model for Brain Shift Compensation", Information Processing in Medical Imaging, Proceedings, Davis, CA, USA, pp. 183-189, June 2001. LINK
 Skrinjar, O., "Deformable Models in Image-Guided Neurosurgery", PhD Thesis, Yale University, May 2002. LINK