KEYWORDS: 3D modeling, Tissues, Natural surfaces, Chemical elements, Surgery, Rectum, Data modeling, Data acquisition, Magnetic resonance imaging, Bladder
Physiological changes in the spatial configuration of the internal organs in the abdomen can induce different
disorders that need surgery. Following the complexity of the surgical procedure, mechanical simulations are
necessary but the in vivo factor makes complicate the study of pelvic organs. In order to determine a realistic
behavior of these organs, an accurate geometric model associated with a physical modeling is therefore required.
Our approach is integrated in the partnership between a geometric and physical module. The Geometric Modeling
seeks to build a continuous geometric model: from a dataset of 3D points provided by a Segmentation step,
surfaces are created through a B-spline fitting process. An energy function is built to measure the bidirectional
distance between surface and data. This energy is minimized with an alternate iterative Hoschek-like method. A
thickness is added with an offset formulation, and the geometric model is finally exported in a hexahedral mesh.
Afterward, the Physical Modeling tries to calculate the properties of the soft tissues to simulate the organs
displacements. The physical parameters attached to the data are determined with a feedback loop between
finite-elements deformations and ground-truth acquisition (dynamic MRI).
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