Flip angle modulation in single shot fast spin echo imaging greatly increases speed with little change in diagnostic image quality
Andreas M. Loening 1 , Manojkumar Saranathan 1 , Nichanan Ruangwattanapaisarn 2 , Daniel V. Litwiller 3 , Ann Shimakawa 3 , and Shreyas S. Vasanawala 1
Dept. of Radiology, Stanford University
School of Medicine, Stanford, CA, United States,
of Medicine, Ramathibodi Hospital, Mahidol University,
GE Healthcare Global MR
Applications and Workflow, Rochester, MN, Menlo Park,
CA, United States
Single shot fast spin echo acquisition speed is limited
by specific absorption rate (SAR). Instead of using a
constant low flip angle to reduce SAR, we modulated the
refocusing flip angle over the course of the echo train
and achieved an at least doubling of imaging speed
(2-fold reduction in TR) while preserving image quality.
This enabled abdominal scans with fewer, shorter
breath-holds and better registered images.
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