Abstract #4688

Using cardiac magnetic resonance imaging to assess advantages of cardiac-gated radioablation

Justin Poon^1,2, Richard B Thompson³, Marc W Deyell⁴, Devin Schellenberg⁵, Kirpal Kohli⁶, and Steven Thomas²

¹Department of Physics & Astronomy, University of British Columbia, Vancouver, BC, Canada, ²Department of Medical Physics, BC Cancer - Vancouver, Vancouver, BC, Canada, ³Department of Biomedical Engineering, University of Alberta, Edmonton, AB, Canada, ⁴Heart Rhythm Services and Centre for Cardiovascular Innovation, Division of Cardiology, University of British Columbia, Vancouver, BC, Canada, ⁵Department of Radiation Oncology, BC Cancer - Surrey, Surrey, BC, Canada, ⁶Department of Medical Physics, BC Cancer - Surrey, Surrey, BC, Canada

Synopsis

Keywords: Arrhythmia, Radiotherapy, cardiac radioablationCardiac magnetic resonance (CMR) images and tracked left ventricle (LV) contour points were used to investigate the advantages of a cardiac-gated radioablation treatment for ventricular tachycardia. Contour points were divided into 17 segments of the LV. Individual segments were treated as hypothetical targets, and an optimal treatment window was determined where cardiac motion was minimal. Target centroid displacement and treatment area were quantified for the treatment window and the full cardiac cycle. Using a cardiac-gated radioablation treatment would allow for reduced treatment margins and minimize the dose delivered to surrounding normal tissue.

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