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Abstract #4151

Localization of an HDR brachytherapy source using MR artifact simulation and phase-only cross correlation

Ellis Beld 1,2 , Marinus A. Moerland 1 , Job G. Bouwman 2 , Frank Zijlstra 2 , Jan J.W. Lagendijk 1 , Max A. Viergever 2 , and Peter R. Seevinck 2

1 Department of Radiotherapy, University Medical Center Utrecht, Utrecht, Utrecht, Netherlands, 2 Image Sciences Institute, University Medical Center Utrecht, Utrecht, Utrecht, Netherlands

Image guidance is of great importance in high-dose-rate (HDR) prostate brachytherapy. A robotic MR-guided HDR brachytherapy treatment is being developed and one of the aims is real-time tracking of the HDR source. In this study, localization of an HDR brachytherapy source was performed retrospectively, by simulating the artifact of the source in a gradient echo image and matching the simulated artifact to the experimental image by means of phase-only cross correlation. Furthermore, it was investigated to what extent the localization depends on the materials of the interventional devices.

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