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Abstract #2384

Comparing Bloch-Siegert B1+ Mapping using Single Channel and Channel Combination Tx Methods

Mohammad Mehdi Khalighi 1 , Gaohong Wu 2 , and Qin Liu 2

1 Applied Science Lab, GE Healthcare, Menlo Park, CA, United States, 2 MR Engineering, GE Healthcare, Waukesha, WI, United States

The adiabatic Bloch-Siegert B1 mapping is optimized for single channel transmit and channel combination transmit methods. Phantom comparison shows that single channel transmit has a better SNR for B1+ magnitude and phase. The two methods are also compared in parallel transmit application with a 3-spoke pTx RF pulse design where it is shown that single channel transmit method results in a better homogeneity. It is concluded that unlike DAM and AFI, the single channel transmit method is preferred over channel combination for B-S B1 mapping.

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