A velocity-dependent model for needle insertion in soft tissue

  • Authors:

  • Jessica R. Crouch;Chad M. Schneider;Josh Wainer;Allison M. Okamura

  • Affiliations:

  • Computer Science Dept., Old Dominion University, VA;Engineering Research Center for Computer Integrated Surgical Systems & Technology, Johns Hopkins University, Baltimore, MD;Engineering Research Center for Computer Integrated Surgical Systems & Technology, Johns Hopkins University, Baltimore, MD;Engineering Research Center for Computer Integrated Surgical Systems & Technology, Johns Hopkins University, Baltimore, MD

  • Venue:
  • MICCAI'05 Proceedings of the 8th international conference on Medical image computing and computer-assisted intervention - Volume Part II
  • Year:
  • 2005

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Abstract

Models that predict the soft tissue deformation caused by needle insertion could improve the accuracy of procedures such as brachy-therapy and needle biopsy. Prior work on needle insertion modeling has focused on static deformation; the experiments presented here show that dynamic effects such as relaxation are important. An experimental setup is described for recording and measuring the deformation that occurs with needle insertion into a soft tissue phantom. Analysis of the collected data demonstrates the time- and velocity-dependent nature of the deformation. Deformation during insertion is shown to be well represented using a velocity-dependent force function with a linear elastic finite element model. The model's accuracy is limited to the period during needle motion, indicating that a viscoelastic tissue model may be required to capture tissue relaxation after the needle stops.