%0 Journal Article
%A Brunheim, Sascha
%A Gratz, Marcel
%A Johst, Sören
%A Bitz, Andreas
%A Fiedler, Thomas
%A Ladd, Mark
%A Quick, Harald H
%A Orzada, Stephan
%T Fast and accurate multi-channel B1+ mapping based on the TIAMO technique for 7T UHF body MRI.
%J Magnetic resonance in medicine
%V 79
%N 5
%@ 0740-3194
%C New York, NY [u.a.]
%I Wiley-Liss
%M DKFZ-2018-00148
%P 2652 - 2664
%D 2018
%X Current methods for mitigation of transmit field B1+ inhomogeneities at ultrahigh field (UHF) MRI by multi-channel radiofrequency (RF) shimming rely on accurate B1+ mapping. This can be time consuming when many RF channels have to be mapped for in vivo body MRI, where the B1maps should ideally be acquired within a single breath-hold. Therefore, a new B1+ mapping technique (B1TIAMO) is proposed.The performance of this technique is validated against an established method (DREAM) in phantom measurements for a cylindrical head phantom with an 8-channel transmit/receive (Tx/Rx) array. Furthermore, measurements for a 32-channel Tx/Rx remote array are conducted in a large body phantom and the  - B1+ -  map reliability is validated against simulations of the transmit RF field distribution. Finally, in vivo results of this new mapping technique for human abdomen are presented.For the head phantom (8-channel Tx/Rx coil), the single  - B1+ -  comparison between B1TIAMO, the direct DREAM measurements, and simulation data showed good agreement with 10-19
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:28994132
%R 10.1002/mrm.26925
%U https://inrepo02.dkfz.de/record/132460