A modified multi-echo AFI for simultaneous B1 magnitude and phase mapping |
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Authors: | Narae Choi Joonsung LeeMin-Oh Kim Jaewook ShinDong-Hyun Kim |
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Affiliation: | Department of Electrical and Electronic Engineering, Yonsei University, Seoul, South Korea |
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Abstract: | To simultaneously acquire the B1+ magnitude and B1+ phase, a modified multi-echo actual flip-angle imaging (AFI) sequence is proposed. A multi-echo gradient echo sequence was integrated into every even TR of AFI to measure both magnitude and phase of B1+. In addition, to increase the signal-to-noise ratio of the B1+ phase, a double-angle multi-echo AFI sequence, in which the flip-angle of the RF pulses is α at the odd TR and 2α at the even TR is proposed. Images were simulated to evaluate the performance of this method under various imaging and physical parameters. The performance was compared to the spin echo based B1+ mapping method in phantom and in vivo studies. |
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Keywords: | B1 mapping B1 phase Actual flip-angle imaging Double-angle AFI (DA AFI) Multi-echo AFI B1 complex mapping |
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