TY  - JOUR
AU  - Brunheim, Sascha
AU  - Gratz, Marcel
AU  - Johst, Sören
AU  - Bitz, Andreas
AU  - Fiedler, Thomas
AU  - Ladd, Mark
AU  - Quick, Harald H
AU  - Orzada, Stephan
TI  - Fast and accurate multi-channel B1+ mapping based on the TIAMO technique for 7T UHF body MRI.
JO  - Magnetic resonance in medicine
VL  - 79
IS  - 5
SN  - 0740-3194
CY  - New York, NY [u.a.]
PB  - Wiley-Liss
M1  - DKFZ-2018-00148
SP  - 2652 - 2664
PY  - 2018
AB  - 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
LB  - PUB:(DE-HGF)16
C6  - pmid:28994132
DO  - DOI:10.1002/mrm.26925
UR  - https://inrepo02.dkfz.de/record/132460
ER  -