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Abstract #5537

Low-field cardiac MRI for cardiac radiosurgery using an integrated MRI-guided radiotherapy system

H Michael Gach1, Roger Nana2, Clifford G Robinson3, Philip S Cuculich4, Rojano Kashani3, Jeffrey D Bradley3, Michael C Roach3, James F Dempsey5, Sasa Mutic3, and Olga Green3

1Radiation Oncology and Radiology, Washington University in St Louis, St Louis, MO, United States, 2ViewRay, Oakwood Village, OH, United States, 3Radiation Oncology, Washington University in St Louis, St Louis, MO, United States, 4Cardiovascular, Washington University in St Louis, St Louis, MO, United States, 5ViewRay, Mountain View, CA, United States

Integrated MRI-guided radiotherapy (MRIgRT) systems perform simultaneous MRI acquisitions during radiation therapy to optimize the accuracy of dose delivery. Cardiac radiosurgery using stereotactic body radiation therapy (SBRT) is a promising new treatment option for cardiac arrhythmias. We imaged the heart with a novel ungated radial TrueFISP sequence on a 0.35 T MRIgRT system. The sequence is being developed for next generation SBRT. Image artifacts associated with the sequence were measured using a Medtronic implantable cardiac defibrillator (ICD) in hydrogel and extended 13 cm from its center. Thus, artifacts should not preclude MRIgRT for most patients with ICDs.

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