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Abstract #0667

Improved Fat and Water Depiction in Musculoskeletal MRI by Control of Through-Slice Chemical-Shift Artifacts in 2D Turbo-Spin-Echo Imaging at 7 T

Constantin von Deuster1,2, Stefan Sommer1,2, Christoph Germann3,4, Natalie Hinterholzer2, Robin M. Heidemann5, Reto Sutter3,4, and Daniel Nanz2,4
1Siemens Healthcare, Zurich, Switzerland, 2Swiss Center for Musculoskeletal Imaging (SCMI), Balgrist Campus, Zurich, Switzerland, 3Radiology, Balgrist University Hospital, Zurich, Switzerland, 4University of Zurich, Zurich, Switzerland, 5Siemens Healthcare, Erlangen, Germany

The large water-fat frequency difference at 7 T renders imaging of the musculoskeletal (MSK) anatomy very challenging. In particular, through-slice chemical-shift artifacts may manifest in state-of-the-art 2D turbo-spin-echo (TSE) images as partial or locally complete fat-signal loss that radiologists are usually not trained to account for from lower field strengths. In this work, we demonstrate the range of possible through-slice artifacts in MSK images and show that matched RF-pulse bandwidths as high as 1500 Hz for the excitation and refocusing RF-pulses are necessary to consistently perform successful, non-fat suppressed MSK imaging at 7 T.

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