Abstract #2545

Motion Averaged MR-Based Attenuation Correction for Coronary 18F-Fluoride Hybrid PET/MR

Philip M Robson¹, Marc R Dweck¹, Nicolas A Karakatsanis¹, Maria Giovanna Trivieri², Ronan Abgral¹, Johanna Contreras², Umesh Gidwani², Jagat P Narula², Valentin Fuster², Jason C Kovacic², and Zahi A Fayad¹

¹Translational and Molecular Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States, ²Department of Cardiology, Icahn School of Medicine at Mount Sinai, New York, NY, United States

Cardiac and coronary imaging using hybrid PET/MR is gaining increasing interest. PET image reconstruction requires knowledge of the PET-photon attenuation of the object in order to produce accurate images of PET tracer activity. The standard approach for MR-based attenuation correction is breath-hold volumetric imaging to freeze motion of the chest and abdomen. However, for imaging the heart, alignment of anatomy during PET data collection and attenuation measurement is crucial. In this work, we propose mapping attenuation using a free-breathing golden-angle radial gradient echo sequence and compare the PET images produced with this novel approach and the standard breath-hold approach.

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