title: Optimized image-based soft tissue deformation algorithms for visualization of haptic needle insertion.
abstract: Real-time surgical simulation relies on the fast computation of soft tissue deformations. In this paper, we present image-based algorithms for computing the deformations of a volumetric image during a needle insertion in real-time. The algorithms are based on diffusive and linear elastic finite difference methods as utilized in image registration. For an evaluation, the methods are compared to a finite element simulation of the pre-puncture phase of a needle insertion. Furthermore, the methods are improved and tested; contrary to our assumption, an improved diffusion based approach outperforms a linear elastic approach. The algorithms are used to perform a VR simulation of a needle insertion with visuo-haptic feedback.
authors: Institute of Medical Informatics, University of Lübeck, Lübeck, Germany. fortmeier@imi.uni-luebeck.de
authors: Dirk
authors: D
authors: Fortmeier
authors: Andre
authors: A
authors: Mastmeyer
authors: Heinz
authors: H
authors: Handels
mesh_terms: D000465:Algorithms; D001706:Biopsy / Q000295:instrumentation / Q000379:methods*; D003198:Computer Simulation; D006244:Hardness / Q000502:physiology; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008099:Liver / Q000166:cytology / Q000502:physiology; D008954:Models, Biological; D009339:Needles; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014584:User-Computer Interface