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Abstract #2796

Comparison of Simultaneous Non-Contrast Angiography and intraPlaque Hemorrhage (SNAP) and 3D Time of Flight (TOF) for Non-Contrast Intracranial MR Angiography (MRA)

Qiang Zhang1, Jia Ning1, Shuo Chen1, Zhensen Chen1, Xihai Zhao1, Chun Yuan2, and Huijun Chen1

1Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, People's Republic of China, 2Department of Radiology, University of Washington

The purpose of this study is to compare the MRA image contrast of SNAP and TOF sequences in in-vivo cerebral artery images and explore the explanation of the observation by theoretical simulation. We found TOF MRA showed better artery-background contrast than SNAP MRA in proximal large cerebral artery for all cases, but worse in distal small cerebral artery for most of the cases. The theoretical simulation considering the blood velocity and the blood travel distance in imaging slab further validated this observation, suggesting the contrast difference between SNAP and TOF were related to blood velocity and travel distance.

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