Marchal, MaudPromayon, EmmanuelTroccaz, JocelyneCesar Mendoza and Isabel Navazo2014-02-012014-02-0120063-905673-61-4https://doi.org/10.2312/PE/vriphys/vriphys06/109-118Simulating surgical procedures is still a complex challenge. Either modeling methods or simulators have to take into account specific geometries and properties of the patient organs. In this paper, a new soft tissue modeling method dedicated to prostate surgical interventions is presented. The chosen medical application requires the modeling of a complex anatomical environment including intricate interactions between organs and surgical instruments. We present a discrete model that has been specifically developed to fulfill these requirements. The influence of two particular instruments is studied: needles and ultrasound probe, according to two surgical interventions: biopsy and brachytherapy.Categories and Subject Descriptors (according to ACM CCS): I.3.5[COMPUTER GRAPHICS]: Physically based modeling I.6.8 [SIMULATION AND MODELING]: Animation