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              <p>We present our project which aims at developing, validating and proposing a prototype for a neuronavigation station able to improve the precision of the actual systems, without per-operative MRI. Our goal is to integrate, in a “classical” image guided surgery (IGS) station, a model of the deformations of the cerebral soft-tissue and more specifically the “brain shift”, phenomenon which is observed during neurosurgery. This unables the IGS stations presently commercialized around the world to take into account most of the brain open surgeries. These stations help guiding the surgeons for gestures such as biopsies or tumor resection. Starting from pre-operative medical imaging exams, the tumor is localized on the images and the surgical planning is transferred into the operating room. Because of the “brain shift”, this planning has to be updated during surgery, to ensure sufficient accuracy. The solutions proposed consist in developing a real-time mechanical model of the brain soft tissues, which will be updated with intraoperative ultrasound images, in order to estimate and compensate the mechanical deformations of the brain during surgery. We present advanced technologies for neurosurgery.</p>
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              <p>Presentamos nuestro proyecto que enfoca el desarrollo y validación de un prototipo para ser instalado en un neuronavegador que mejorará la precisión de los sistemas actuales sin la necesidad de RMN intraoperatoria. Nuestro objetivo es la integración, dentro de una estación “clásica” de cirugía asistida por computador (CAC), de un modelo de deformación de los tejidos cerebrales, en particular la causada por el “brain shift”. Este fenómeno impide la utilización de las estaciones de CAC en la mayoría de las cirugías “muy abiertas” del cerebro. Estas estaciones permiten ayudar en la planificación y ejecución de procedimientos quirúrgicos tales como biopsias o resección de tumores. Desde el preoperatorio el tumor es localizado en las neuroimágenes y con ayuda de ellas se efectúa la planificación quirúrgica con la cual se ingresa al quirófano. Debido al “brain shift” esta planificación inicial debe ser actualizada durante la cirugía para asegurar una precisión suficiente. La solución que proponemos consiste en el desarrollo de un modelo biomecánico en tiempo real de los tejidos cerebrales que será actualizado con las imágenes ecográficas intraoperatorias con el objetivo de estimar y compensar las deformaciones del cerebro durante la cirugía.</p>
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