DocumentCode :
1135656
Title :
Needle Insertion Parameter Optimization for Brachytherapy
Author :
Dehghan, Ehsan ; Salcudean, Septimiu E.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC
Volume :
25
Issue :
2
fYear :
2009
fDate :
4/1/2009 12:00:00 AM
Firstpage :
303
Lastpage :
315
Abstract :
This paper presents a new needle path planning method for the insertion of rigid needles into deformable tissue. The needle insertion point, needle heading, and needle depth are optimized by minimizing the distance between a rigid needle and a number of targets in the tissue. The optimization method is based on iterative simulations performed using a tissue finite element model. At each iteration, the best 3-D line fitted to the displaced targets in the deformed tissue is used as a candidate for a new insertion line. First, this method is implemented in a prostate brachytherapy simulator under different boundary conditions to minimize the targeting error. It is shown that the optimization method converges in a few iterations and decreases the seed misplacement error to less than the needle diameter. Second, the efficacy of the optimization algorithm is verified by optimizing the insertion parameters for a brachytherapy needle before insertion into a prostate tissue phantom. The elastic properties of the phantom and the needle-tissue interaction parameters were identified in an independent experiment. The optimization algorithm is effective in decreasing the targeting error.
Keywords :
brachytherapy; finite element analysis; medical robotics; needles; path planning; brachytherapy needle; needle depth; needle heading; needle insertion parameter optimization; needle insertion point; needle path planning method; needle-tissue interaction parameters; optimization algorithm; phantom elastic properties; prostate brachytherapy simulator; prostate tissue phantom; seed misplacement error; tissue finite element model; Brachytherapy; Finite Element Method (FEM); needle insertion; needle path planning;
fLanguage :
English
Journal_Title :
Robotics, IEEE Transactions on
Publisher :
ieee
ISSN :
1552-3098
Type :
jour
DOI :
10.1109/TRO.2008.2011415
Filename :
4770177
Link To Document :
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