Takeshi KOISHI,Shinya MORITA, Toshiya NAKAGUCHI, Yasuhiro KAWAGUCHI, Norimichi
TSUMURA, Yoichi MIYAKE
Chiba University
Transactions of the Japanese Society for Medical and Biological Engineering : BME 46(6) pp.629-646 2008
Abstract
In percutaneous puncture simulation, the finite element method is usually
used to compute the needle bend and tissue deformation. This method, however,
tends to be not suitable for real-time applications such as training systems
due to its high computational cost. In this paper, we propose a novel deformable
model with a low computational cost. The proposed model reproduces needle
bend and tissue deformation in the direction perpendicular to the long
axis of the needle. The proposed model consists of a soft tissue deformation
model based on the Long Element Method (LEM) and a needle bending model
which is designed to be consistent with the tissue model. The parameters
for both models are put in the same simultaneous equation to be solved
for the simulation. We verified that the proposed model shows a low computational
cost by the computer simulation. The accuracy of the model was also evaluated
by the experiment using needles and tissue phantoms. The experimental result
using only needles showed that a bend could be estimated by the pre-optimized
parameters. The optimized parameters were available even if different displacement
was given to the manipulated point of the needle.
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