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Abstract #3844

Three-Point Dixon Abdominal Water/Fat Separation using a Lower-Field 0.75T MRI

Christian Guenthner1, Hannes Dillinger1, Peter Boernert2,3, and Sebastian Kozerke1
1University and ETH Zurich, Zurich, Switzerland, 2Philips Research, Hamburg, Germany, 3Leiden University Medical Center, Leiden, Netherlands

Water/fat separation can be performed by exploiting chemical shift, which is proportional to field strength. Hence, on lower-field MRI systems (0.1 … 1T), the absolute resonance frequency difference is reduced compared to clinical high-field MRI, raising the question if water/fat separation can still be reliably performed despite the proximity of the resonances. In this work, we examined the feasibility of Dixon-type water/fat separation in the abdomen on a 0.75T lower-field MRI system. We show that Cartesian multi-acquisition and multi-echo as well as spiral multi-acquisition sequences provide reliable water/fat separation despite the reduced water/fat resonance shift of approximately 108 Hz.

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