The importance of organ geometry and boundary constraints for planning of medical interventions

Misra, S. and Macura, K.J. and Ramesh, K.T. and Okamura, A.M. (2009) The importance of organ geometry and boundary constraints for planning of medical interventions. Medical Engineering & Physics, 31 (2). pp. 195-206. ISSN 1350-4533

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Abstract:	Realistic modeling of medical interventions involving tool–tissue interactions has been considered to be a key requirement in the development of high-fidelity simulators and planners. Organ geometry, soft-tissue constitutive laws, and boundary conditions imposed by the connective tissues surrounding the organ are some of the factors that govern the accuracy of medical intervention planning. In this study it is demonstrated that, for needle path planning, the organ geometry and boundary constraints surrounding the organ are the most important factors influencing the deformation. As an example, the procedure of needle insertion into the prostate (e.g. for biopsy or brachytherapy) is considered. Image segmentation is used to extract the anatomical details from magnetic resonance images, while object-oriented finite element analysis (OOF) software is used to generate finite element (FE) meshes from the segmented images. Two-dimensional FE simulations that account for complex anatomical details along with relative motion between the prostate and its surrounding structure using cohesive zone models are compared with traditional simulation models having simple organ geometry and boundary constraints. Nodal displacements for these simpler models were observed to be up to 14 times larger than those obtained from the anatomically accurate models.
Item Type:	Article
Copyright:	© 2009 Elsevier
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Robotics and Mechatronics (CE)
Link to this item:	http://purl.utwente.nl/publications/71272
Official URL:	http://dx.doi.org/10.1016/j.medengphy.2008.08.002
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