Laura Sacolick1, William A. Grissom1, Guido Kudielka1, Wolfgang Loew2, Mika W. Vogel1
1GE Global Research,
Bloch-Siegert B1 mapping is presented here for high channel count parallel transmit application. Compared to single transmit coils, parallel transmit systems present unique problems of acquiring many B1 maps quickly, and measuring low amplitude B1 fields from individual coil elements. Here we present a scheme where the complex B1 field amplitude and phase are determined from Bloch-Siegert B1 maps acquired sequentially for the composite field of all but one transmit channel.