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Abstract #2803

Transluminal Attenuation Gradient in Non-contrast Whole Heart Magnetic Resonance Coronary Angiography (MRA TAG) – Noninvasive Methods for Assessment of Coronary Flow: A Comparison with Coronary Computed Tomography Angiography TAG

Yuki Ohmoto-Sekine1, Junji Takahashi2, Takashi Yoshida2, Rieko Ishimura3, Makiko Ishihara4, Yasuji Arase1, and Mitsue Miyazaki5

1Health Management Center, Toranomon Hospital, Tokyo, Japan, 2Radiology Dept., Toranomon Hospital, Tokyo, Japan, 3Cardiovascular Center, Toranomon Hospital, Tokyo, Japan, 4Imaging Center, Toranomon Hospital, Tokyo, Japan, 5Toshiba Medical Research Institute, Chicago, IL, United States

CT coronary angiography (CTA) and non-contrast coronary MRA are established non-invasive methods for anatomical assessment of coronary artery stenosis; however, functional information is limited. Transluminal attenuation gradient (TAG) of CTA predicts a functional significant stenosis. The aim of this study was to access TAG using non-contrast whole heart coronary MRA (MRA TAG) as compared to TAG using CTA (CTA TAG). Preliminary evaluation of MRA TAG provides acceptable prediction of invasive FFR. Further study is required to determine an appropriate prediction of MRA TAG.

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