Quantifying stranded implant displacement following prostate brachytherapy

Authors:
Julio Lobo;Mehdi Moradi;Nick Chng;Ehsan Dehghan;Gabor Fichtinger;William J. Morris;Septimiu E. Salcudean
Affiliations:
Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, Canada;Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, Canada;British Columbia Cancer Agency;School of Computing, Queen's University;School of Computing, Queen's University;British Columbia Cancer Agency;Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, Canada
Venue:
MICCAI'11 Proceedings of the 14th international conference on Medical image computing and computer-assisted intervention - Volume Part I
Year:
2011

Citing 3
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Prostate brachytherapy seed reconstruction using c-arm rotation measurement and motion compensation

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Abstract

We aim to compute radioactive stranded-implant displacement during and after prostate brachytherapy. We present the methods used to identify corresponding seeds in planned, intra-operative and postimplant patient data that enable us to compute seed displacements. A minimum cost network flow algorithm is used, on 8 patients, for needle track detection to group seeds into needles that can be matched between datasets. An iterative best line detection algorithm is used both to help with needle detection and to register the different datasets. Our results show that there was an average seed misplacement of 5.08±2.35 mm during the procedure, which then moved another 3.10±1.91 mm by the time the quality assurance CT was taken. Several directional trends in different regions of the prostate were noted and commented on.