Abstract #2356

Reducing femoral flow artefacts in radial MR Fingerprinting: A comparison of two methods applied to prostate imaging

Kaia Ingerdatter Sørland¹, Christopher George Trimble¹, Tone Frost Bathen^1,2, Mattijs Elschot^1,2, and Martijn A. Cloos³

¹Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway, ²Department of Radiology and Nuclear Medicine, St. Olavs hospital, Trondheim University Hospital, Trondheim, Norway, ³Centre for Advanced Imaging, The University of Queensland, Brisbane, Australia

Synopsis

Keywords: MR Fingerprinting/Synthetic MR, Artifacts

High acceleration factors in radial magnetic resonance fingerprinting (MRF) of the prostate lead to strong streaking artefacts from flow in the femoral blood vessels, distorting quantitative T₁ and T₂ measurements. We here compare two approaches to mitigate these artefacts, namely incorporating regional saturation bands in the MRF sequence (Sat-MRF) or applying region-optimized virtual coils to suppress signal from select spatial regions before image reconstruction (ROVir-MRF). Results from seven asymptomatic volunteers show that both methods efficiently reduce signal in the region of the femoral vessels, but there are differences in retained prostate signal to noise ratio and sensitivity to T₁.

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