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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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