A simulation study of BrachyShade, a shadow-based internal source tracking system for HDR prostate brachytherapy
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Date
2018-10-18
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Abstract
This paper presents a simulation study of BrachyShade, a proposed internal source-tracking system for real time quality assurance in high dose rate prostate brachytherapy. BrachyShade consists of a set of spherical tungsten occluders located above a pixellated silicon photodetector. The source location is estimated by minimising the mean squared error between a parametric model of the shadow image and acquired images of the shadows projected on the detector plane. A novel algorithm is finally employed to correct the systemic error resulting from Compton scattering in the medium. The worst-case error obtained with BrachyShade for a 13.5 ms image acquisition is less than 1.3 mm in the most distant part of the treatment volume, while for 75% of source locations an error of less than 0.42 mm was achieved. © 2018 Commonwealth of Australia. Department of Education and Training, and Department of Industry, Innovation and Science.
Description
Keywords
Simulation, Prostate, Brachytherapy, Silicon, Parametric amplifiers, Tungsten, Photodetectors, Neoplasms, Scattering
Citation
Alabd, R., Safavi-Naeini, M., Wilson, K. J., Rosenfeld, A. B., & Franklin, D. R. (2018). A simulation study of BrachyShade, a shadow-based internal source tracking system for HDR prostate brachytherapy. Physics in Medicine & Biology, 63(20), 205019. doi:10.1088/1361-6560/aae33d