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Abstract #4014

Feasibility of free breathing real-time cine-MRI for MR-guided Cardiac Radioablation on the Unity MR-linac 

Osman Akdag1, Stefano Mandija1, Pim Borman1, Eveline Alberts2, and Martin Fast1
1Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands, 2Philips Healthcare, Best, Netherlands

Stereotactic arrhythmia radioablation (STAR) is a novel non-invasive treatment technique for ventricular tachycardia patients, refractory to conventional catheter ablation. Here, we investigate the feasibility of integrating real-time, free-breathing, cardiac cine-MRI into the STAR radiotherapy workflow. As a first step towards MRI-guided STAR treatments, we test our imaging approach on a diagnostic 1.5T MRI-simulator (Philips, Ingenia), and on a 1.5T Elekta Unity MR-linac. Our results indicate the feasibility of acquiring real-time, free-breathing, cine MRI images on both systems at 14Hz, enabling real-time motion assessment and delivery adaptation without additional cardiac imaging hardware.

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