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Abstract #0451

Soft-gated accelerated Cartesian 4D flow imaging with intrinsic navigation

Joseph Y Cheng 1,2 , Marcus T Alley 2 , Tao Zhang 1,2 , Peng Lai 3 , Jonathan I Tamir 4 , Martin Uecker 4 , John M Pauly 1 , Michael Lustig 4 , and Shreyas S Vasanawala 2

1 Electrical Engineering, Stanford University, Stanford, CA, United States, 2 Radiology, Stanford University, Stanford, CA, United States, 3 Global Applied Science Laboratory, GE Healthcare, Menlo Park, CA, United States, 4 Electrical Engineering and Computer Sciences, University of California, Berkeley, CA, United States

Time-resolved phase contrast MRI (4D flow) can quantify cardiac function and flow. The technique may even permit complex anatomical assessment, thus comprising a comprehensive exam in a single scan. Unfortunately, artifacts from respiratory motion compromise this ability. Therefore, we developed a simple method to measure motion using readily available navigation information from the flow encoding gradients. We incorporated and modified a variable-density sampling and radial view-ordering scheme to facilitate motion correction and compressed sensing methods. Lastly, we integrated soft-gating to the compressed sensing and parallel imaging reconstruction. These motion-compensation approaches help improve the reliability and resolution of 4D flow imaging.

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