TY  - JOUR
AU  - Rietsch, Stefan H G
AU  - Pfaffenrot, Viktor
AU  - Bitz, Andreas K
AU  - Orzada, Stephan
AU  - Brunheim, Sascha
AU  - Lazik-Palm, Andrea
AU  - Theysohn, Jens M
AU  - Ladd, Mark E
AU  - Quick, Harald H
AU  - Kraff, Oliver
TI  - An 8-channel transceiver 7-channel receive RF coil setup for high SNR ultrahigh-field MRI of the shoulder at 7T.
JO  - Medical physics
VL  - 44
IS  - 12
SN  - 0094-2405
CY  - College Park, Md.
PB  - AAPM
M1  - DKFZ-2022-01939
SP  - 6195 - 6208
PY  - 2017
AB  - In this work, we present an 8-channel transceiver (Tx/Rx) 7-channel receive (Rx) radiofrequency (RF) coil setup for 7 T ultrahigh-field MR imaging of the shoulder.A C-shaped 8-channel Tx/Rx coil was combined with an anatomically close-fitting 7-channel Rx-only coil. The safety and performance parameters of this coil setup were evaluated on the bench and in phantom experiments. The 7 T MR imaging performance of the shoulder RF coil setup was evaluated in in vivo measurements using a 3D DESS, a 2D PD-weighted TSE sequence, and safety supervision based on virtual observation points.Distinct SNR gain and acceleration capabilities provided by the additional 7-channel Rx-only coil were demonstrated in phantom and in vivo measurements. The power efficiency indicated good performance of each channel and a maximum B1+ of 19 μT if the hardware RF power limits of the MR system were exploited. MR imaging of the shoulder was demonstrated with clinically excellent image quality and submillimeter spatial resolution.The presented 8-channel transceiver 7-channel receive RF coil setup was successfully applied for in vivo 7 T MRI of the shoulder providing a clear SNR gain vs the transceiver array without the additional receive array. Homogeneous images across the shoulder region were obtained using 8-channel subject-specific phase-only RF shimming.
KW  - Humans
KW  - Magnetic Resonance Imaging: instrumentation
KW  - Phantoms, Imaging
KW  - Radio Waves
KW  - Shoulder: diagnostic imaging
KW  - Signal-To-Noise Ratio
KW  - 7 Tesla (7T) (Other)
KW  - RF antenna array (Other)
KW  - radio frequency (RF) (Other)
KW  - shoulder (Other)
KW  - ultrahigh-field MRI (Other)
LB  - PUB:(DE-HGF)16
C6  - pmid:28976586
DO  - DOI:10.1002/mp.12612
UR  - https://inrepo02.dkfz.de/record/181312
ER  -