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Abstract #3020

4-Dimensional spin echo for prostate 1H MRSI at 7T using a multi-transmit system

Nienke D. Sijtsema1, Arjan D. Hendriks1, Peter R. Luijten1, Dennis W.J. Klomp1, Petra J.W. Pouwels2, and Catalina S. Arteaga de Castro1

1Imaging Division, University Medical Center, Utrecht, Netherlands, 2Department of Physics and Medical Technology, VU University Medical Center, Amsterdam, Netherlands

A 4-dimensional spatially and spectrally selective spin echo sequence was developed for prostate 1H MRSI at 7T. This sequence has intrinsic water and lipid suppression properties due to the limited spectral bandwidth, so only prostate metabolites are measured. The low peak power of the pulses also leads to lower SAR deposition and RF duty cycles. Phantom experiments showed an average water suppression of 99.99% at short TE, with low SAR and RF duty cycle values compared to adiabatic pulses routinely used at higher field strengths. Combined, these properties enable fast prostate MRSI acquisitions without water and lipid artifacts.

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