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Abstract #0654

Flow-Induced Phase Effects in Non-Subtractive Fat-Water Separated MRA

Mahdi Salmani Rahimi 1 , James H Holmes 2 , Kang Wang 2 , Alejandro Roldan 3 , and Frank Korosec 3,4

1 Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, United States, 2 Global MR Applications and Workflow, GE Heatlhcare, Madison, WI, United States, 3 Radiology, University of Wisconsin-Madison, Madison, WI, United States, 4 Medical Physics, University of Wisconsin-Madison, Madison, WI, United States

Dual-echo fat-water separated techniques have been recently used for MR angiography of the lower extremities. Bipolar readout gradients regularly used in multi-echo acquisitions can cause an extra phase shift in flowing spins that is not typically accounted for in fat-water signal separation models. This work investigates the effects of these readout gradients on the flowing spins using a controlled flow pump and a stenosis phantom. Results from the phantom experiment show the degree of stenosis may be overestimated at high flow velocities due to water inappropriately being mapped to the fat image when using bipolar readout gradient acquisitions. Non-bipolar readout gradients are shown to mitigate these effects.

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