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VISE Fall Seminar 8.23.16: Matthieu Chabanas, PhD

Posted by on Tuesday, August 23, 2016 in News.

Title:   Vessel-based brain-shift compensation using biomechanical modeling and intraoperative ultrasound

ChabanasSpeaker:  Matthieu Chabanas, PhD, Associate Professor of Computer Science, Department of Computer Science, Grenoble Institute of Technology, FR

Date: Tuesday, August 23

Time: 12:10 start, noon lunch

Place:  Stevenson Center 5326

Abstract:  During brain tumor surgery, planning and guidance are based on the pre-operative images which do not account for brain-shift. However, this deformation is a major source of error in neuronavigation systems and affects the accuracy of the procedure. A new brain-shift compensation method is thus presented.  A patient-specific biomechanical model of the brain is first built from pre-operative MR images, including blood vessels around the tumor.  Sliding contacts are allowed between brain soft tissues and the dura matter, tentorium and cerebral falx.  This model is used to iteratively register the pre-operative vascular tree to the intra-operative one, extracted from navigated Doppler ultrasound images. In addition, the tissue compression from the probe is also taken into account using the transducer footprint in B-mode images and the external surface of the model. MR images are then updated using the global deformation field, in order to fit the actual intra-operative state.  Qualitative and quantitative results on 4 surgical cases are presented, as well as execution time for each step of the process. This method has proven to be efficient and usable in surgical practice.

Speaker Bio:  Matthieu Chabanas, PhD, is an Associate Professor in Computer Science at  the Grenoble Institute of Technology in France.  He received his doctoral thesis in Biomedical Engineering in 2002 from the University of Grenoble, in the Computer Aided Medical Intervention team of the TIMC-IMAG lab, before a two-year post-doctoral fellowship in the Biomechanics Lab of Toulouse. During these five years, he worked on modeling the face soft tissue for computer-aided maxillofacial surgery. In 2005, he joined the GIPSA-lab in the Speech Production department. In 2014, he came back to TIMC-IMAG. His research topics are medical simulation and biomechanical modeling, their evaluation with clinical data and images, and their actual use in computer-aided applications. This includes various competences from image processing (segmentation and registration, ultrasound imaging) to mesh registration and FEM simulation. His main applications concern neurosurgery, orthopaedics, thoracic surgery and maxillofacial surgery.

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