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 Deuster^1,2, Stefan Sommer^1,2, Christoph Germann^3,4, Natalie Hinterholzer², Robin M. Heidemann⁵, Reto Sutter^3,4, and Daniel Nanz^2,4

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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