Abstract #3615

Fully automatic in-vivo localization of LDR brachytherapy seeds for post-implant dosimetry using MR simulations and template matching

Frank Zijlstra¹, Job G Bouwman¹, Marinus A Moerland², and Peter R Seevinck¹

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

We present a method which can accurately localize brachytherapy seeds in MRI using fast MR simulations and template matching. In 5 patients we correctly detected and localized 298 out of 307 seeds. Using this method an MRI-only approach to post-implant dosimetry will be possible, which should increase accuracy by not requiring CT to MRI image registration.

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