Abstract #2120

An improved tracking technique for real-time MR-guided beam therapies in moving organs

Cornel Zachiu¹, Nicolas Papadakis², Mario Ries¹, Chrit Moonen¹, and Baudouin Denis de Senneville^1,2

¹Imaging Division, University Medical Center Utrecht, Utrecht, Netherlands, ²Institut de Mathématiques de Bordeaux, Bordeaux, France

Current methods for real-time MR-guided HIFU and EBRT interventions in moving organs rely on an algorithm that is sensitive to gray-level intensity variations from other sources than motion. In this work, an improved real-time tracking algorithm with increased robustness to such effects is proposed and experimentally compared to the existing methods. Results have shown a notable improvement in the quality of the motion estimates when the proposed method was used, while maintaining real-time capabilities. Our method was shown to be potentially beneficial for MR-guided HIFU and EBRT interventions in the abdomen, where cardiac activity might become problematic for current approaches.

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