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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