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Ray-casting based evaluation framework for haptic force feedback during percutaneous transhepatic catheter drainage punctures

  • Andre MastmeyerEmail author
  • Tobias Hecht
  • Dirk Fortmeier
  • Heinz Handels
Original Article

Abstract

Purpose

   Development of new needle insertion force feedback algorithms requires comparison with a gold standard method. A new evaluation framework was formulated and tested on needle punctures for percutaneous transhepatic catheter drainage (PTCD).

Methods

   Needle insertion is an established procedure for minimally invasive interventions in the liver. Up-to-date, needle insertions are precisely planned using 2D axial CT slices from 3D data sets. To provide a 3D virtual reality and haptic training and planning environment, the full segmentation of patient data is often a mandatory step. To lessen the time required for manual segmentation, we propose direct haptic volume-rendering based on CT gray values and partially segmented patient data. The core contribution is a new force output evaluation method driven by a ray-casting technique that defines paths from the skin to target structures, i.e., the right hepatic duct near the juncture with the common hepatic duct. A ray-casting method computes insertion trajectories from the skin to the duct considering no-go structures and plausibility criteria. A rating system scores each trajectory. Finally, the best insertion trajectories are selected that reach the target. Along the selected paths, force output comparison between a reference system and the new haptic force output algorithm is carried out, quantified and visualized.

Results

   The evaluation framework is presented along with an exemplary study of the liver using the atlas data set from a reference patient. In a comparison of our reference method to a newer algorithm, force outputs are found to be similar in 99 % of the paths.

Conclusion

   The proposed evaluation framework allows reliable detection of problematic PTCD trajectories and provides valuable hints to improve force feedback algorithm development.

Keywords

Training Planning Needle puncture  Haptic force feedback PTCD Evaluation framework 

Notes

Acknowledgments

This work is supported by the German Research Foundation (DFG, HA 2355/10-1).

Conflict of interest

Andre Mastmeyer has no conflict of interest. Tobias Hecht has no conflict of interest. Dirk Fortmeier has no conflict of interest. Heinz Handels has no conflict of interest.

Informed consent Informed consent was obtained from all patients for being included in the study. The identity of the subjects under study is not revealed.

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Copyright information

© CARS 2013

Authors and Affiliations

  • Andre Mastmeyer
    • 1
    Email author
  • Tobias Hecht
    • 1
  • Dirk Fortmeier
    • 1
    • 2
  • Heinz Handels
    • 1
  1. 1.Institute of Medical InformaticsUniversity of LübeckLübeckGermany
  2. 2.Graduate School for Computing in Medicine and Life SciencesUniversity of LübeckLübeckGermany

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