%0 Journal Article
%A Rietsch, Stefan H G
%A Pfaffenrot, Viktor
%A Bitz, Andreas K
%A Orzada, Stephan
%A Brunheim, Sascha
%A Lazik-Palm, Andrea
%A Theysohn, Jens M
%A Ladd, Mark E
%A Quick, Harald H
%A Kraff, Oliver
%T An 8-channel transceiver 7-channel receive RF coil setup for high SNR ultrahigh-field MRI of the shoulder at 7T.
%J Medical physics
%V 44
%N 12
%@ 0094-2405
%C College Park, Md.
%I AAPM
%M DKFZ-2022-01939
%P 6195 - 6208
%D 2017
%X 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.
%K Humans
%K Magnetic Resonance Imaging: instrumentation
%K Phantoms, Imaging
%K Radio Waves
%K Shoulder: diagnostic imaging
%K Signal-To-Noise Ratio
%K 7 Tesla (7T) (Other)
%K RF antenna array (Other)
%K radio frequency (RF) (Other)
%K shoulder (Other)
%K ultrahigh-field MRI (Other)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:28976586
%R 10.1002/mp.12612
%U https://inrepo02.dkfz.de/record/181312