Kay Nehrke1, Peter Brnert1
1Philips Research Europe, Hamburg, Germany
Accurate B1-mapping is an essential prerequisite for multi-element transmit applications. However, in vivo B1-mapping is still challenging with respect to scan time and mapping accuracy. Recently, a matrix approach for B1-mapping has been proposed to avoid adverse error propagation in the limit of low flip-angles. In the present work, this concept is extended to tailor the transmit channel encoding matrix used for the mapping scan with respect to the chosen application. This approach is essentially equivalent to the transformation of the problem to an appropriate virtual coil array. The underlying theory will be briefly outlined, and basic feasibility will be evaluated on phantoms and in-vivo.