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Abstract #0613

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

Mahesh Bharath Keerthivasan1,2, Lavanya Umapathy2,3, Jean-Philippe Galons2, Diego Martin4, Ali Bilgin2,3,4, 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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