Abstract #3585

Automatic high temporal and spatial resolution position verification of an HDR brachytherapy source using subpixel localization and SENSE

Ellis Beld ¹, Marinus A. Moerland¹, Frank Zijlstra², Jan J.W. Lagendijk¹, Max A. Viergever², and Peter R. Seevinck²

¹Department of Radiotherapy, UMC Utrecht, Utrecht, Netherlands, ²Image Sciences Institute, UMC Utrecht, Utrecht, Netherlands

In order to verify the positions of a high-dose-rate (HDR) brachytherapy source during treatment, fast imaging and post-processing are needed. To get high temporal resolutions, the use of lower spatial resolutions in combination with subpixel source localization and the use of parallel imaging were introduced. MR artifacts were simulated and correlated to the experimentally obtained artifacts (by phase-only cross correlation) to determine the position of the HDR source. It was shown that the described method was fast enough for localization of an HDR brachytherapy source in real-time and high accuracy and precision (submillimeter scale) were achieved.

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