Real-time deformations of organ based on structural mechanics for surgical simulators

Toshiya Nakaguchi; Masashi Tagaya; Nobuhiko Tamura; Norimichi Tsumura; Yoichi Miyake

doi:10.1117/12.654347

13 March 2006 Real-time deformations of organ based on structural mechanics for surgical simulators

Toshiya Nakaguchi, Masashi Tagaya, Nobuhiko Tamura, Norimichi Tsumura, Yoichi Miyake

Proceedings Volume 6143, Medical Imaging 2006: Physiology, Function, and Structure from Medical Images; 61432A (2006) https://doi.org/10.1117/12.654347
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

This research proposes the deformation model of organs for the development of the medical training system using Virtual Reality (VR) technology. First, the proposed model calculates the strains of coordinate axis. Secondly, the deformation is obtained by mapping the coordinate of the object to the strained coordinate. We assume the beams in the coordinate space to calculate the strain of the coordinate axis. The forces acting on the object are converted to the forces applied to the beams. The bend and the twist of the beams are calculated based on the theory of structural mechanics. The bend is derived by the finite element method. We propose two deformation methods which differ in the position of the beams in the coordinate space. One method locates the beams along the three orthogonal axes (x, y, z). Another method locates the beam in the area where the deformation is large. In addition, the strain of the coordinate axis is attenuated in proportion to the distance from the point of action to consider the attenuation of the stress which is a viscoelastic feature of the organs. The proposed model needs less computational cost compared to the conventional deformation method since our model does not need to divide the object into the elasticity element. The proposed model was implemented in the laparoscopic surgery training system, and a real-time deformation can be realized.

Citation Download Citation

Toshiya Nakaguchi, Masashi Tagaya, Nobuhiko Tamura, Norimichi Tsumura, and Yoichi Miyake "Real-time deformations of organ based on structural mechanics for surgical simulators", Proc. SPIE 6143, Medical Imaging 2006: Physiology, Function, and Structure from Medical Images, 61432A (13 March 2006); https://doi.org/10.1117/12.654347

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