Abstract #0613

Efficient T2 mapping of the Abdomen with low SAR Variable Flip Angle Radial Turbo Spin Echo

Mahesh Bharath Keerthivasan^1,2, Lavanya Umapathy^2,3, Jean-Philippe Galons², Diego Martin⁴, Ali Bilgin^2,3,4, and Maria Altbach²

¹Siemens Medical Solutions USA Inc, New York, NY, United States, ²Medical Imaging, University of Arizona, Tucson, AZ, United States, ³Electrical and Computer Engineering, University of Arizona, Tucson, AZ, United States, ⁴Biomedical Engineering, University of Arizona, Tucson, AZ, United States

Radial TSE techniques have been proposed for abdominal T2-weighted (T2w) imaging and T2 mapping. Slice efficiency of breath-held RADTSE is limited by the specific absorption rate (SAR). We present a reduced SAR variable refocusing flip angle RADTSE (RADTSE-VFA) technique designed for efficient slice coverage and improved T2 estimation. The flip angles are designed to (1) minimize T2 estimation error, (2) improve lesion-liver relative contrast, and (3) minimize SAR. RADTSE-VFA generated T2w images with comparable contrast as constant flip angle RADTSE while resulting in a 60% increase in slice coverage at a 1.5x reduction in SAR.

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