Journal
MEDICAL PHYSICS
Volume 44, Issue 12, Pages 6195-6208Publisher
WILEY
DOI: 10.1002/mp.12612
Keywords
7 Tesla (7T); radio frequency (RF); RF antenna array; shoulder; ultrahigh-field MRI
Funding
- European Research Council under European Union's Seventh Framework Programme/ERC [291903]
- University Duisburg-Essen
- European Research Council (ERC) [291903] Funding Source: European Research Council (ERC)
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Purpose: 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. Methods: 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. Results: 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 B-1(+) of 19 mu T 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. Conclusions: 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. (c) 2017 American Association of Physicists in Medicine
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