Abstract #0817
Gradient-modulated SWIFT for SAR reduction and controlled short-T2* sensitivity
Jinjin Zhang 1,2 , Djaudat Idiyatullin 1 , Curtis Corum 1 , Naoharu Kobayashi 1 , and Michael Garwood 1
1
Center for Magnetic Resonance Research,
University of Minnesota, Minneapolis, Minnesota, United
States,
2
School
of Physics and Astronomy, University of Minnesota,
minneapolis, Minnesota, United States
A gradient-modulated SWIFT sequence (GM-SWIFT) is
compared with standard SWIFT sequence. GM-SWIFT is shown
to reduce RF amplitude, SAR, or acquisition time, by up
to 70%, 90% and 45%, respectively, while maintaining
image quality. Also, the choice of gradient modulation
influences the lower limit of the short T2 sensitivity,
which can be exploited to suppress unwanted image haze
from ultra-short T2 signals in the rigid plastic
materials of the coil housing. In summary, GM-SWIFT
reduces RF power requirements and provides a way to
choose sequence parameters for balancing RF amplitude,
SAR, scan time, and image quality considerations.
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