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Abstract #5547

Simultaneous MR imaging and control of an MR compatible afterloader: feasibility of real-time HDR brachytherapy source tracking

Ellis Beld1, Marinus A. Moerland1, Jeroen Schuurman 2, Frank Zijlstra3, Max A. Viergever3, Jan .J.W. Lagendijk1, and Peter R. Seevinck3

1Department of Radiotherapy, UMC Utrecht, Utrecht, Netherlands, 2Elekta NL, Veenendaal, Netherlands, 3Image Sciences Institute, UMC Utrecht, Utrecht, Netherlands

For MR-guided high-dose-rate (HDR) brachytherapy, an MR-compatible afterloader was developed, required for real-time HDR brachytherapy source tracking. This afterloader should be able to function well close to the MRI scanner. The functioning of both the MR-compatible afterloader and the MRI scanner, while operating simultaneously, was investigated. Source localization was performed by a phase-only cross correlation localization method. The results demonstrate that the afterloader was able to send the source to predefined source positions, while simultaneously performing MR imaging. Combined with high-temporal resolution imaging and fast reconstruction/post-processing, this study shows the feasibility of real-time source tracking for MR-guided HDR brachytherapy.

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