A Comparison of Needle Bending Models

  • Ehsan Dehghan
  • Orcun Goksel
  • Septimiu E. Salcudean
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4190)


Modeling the deflection of flexible needles is an essential part of needle insertion simulation and path planning. In this paper, three models are compared in terms of accuracy in simulating the bending of a prostate brachytherapy needle. The first two utilize the finite element method, one using geometric non-linearity and triangular plane elements, the other using non-linear beam elements. The third model uses angular springs to model cantilever deflection. The simulations are compared with the experimental bent needle configurations. The models are assessed in terms of geometric conformity using independently identified and pre-identified model parameters. The results show that the angular spring model, which is also the simplest, simulates the needle more accurately than the others.


Path Planning Beam Element Triangular Element Needle Insertion Prostate Brachytherapy 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Ehsan Dehghan
    • 1
  • Orcun Goksel
    • 1
  • Septimiu E. Salcudean
    • 1
  1. 1.Department of Electrical and Computer EngineeringUniversity of British ColumbiaVancouverCanada

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