Two different transmit B1+ mapping techniques were implemented and investigated for cardiac B1+ shimming at 3T: (1) 2D cardiac-triggered spiral-Bloch-Siegert B1+ mapping; (2) 3D Zero-Echo-Time (ZTE) B1+ phase mapping. B1+ homogeneity was optimised and performance assessed by evaluating the cardiac black-blood fast spin-echo sequence performance in healthy volunteers.
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