A 32-channel parallel transmit system add-on for 7T MRI

Stephan Orzada, Klaus Solbach, Marcel Gratz, Sascha Brunheim, Thomas M Fiedler, Sören Johst, Andreas K Bitz, Samaneh Shooshtary, Ashraf Abuelhaija, Maximilian N Voelker, Stefan H G Rietsch, Oliver Kraff, Stefan Maderwald, Martina Flöser, Mark Oehmigen, Harald H Quick and Mark E Ladd

PLOS ONE, 2019, vol. 14, issue 9, 1-20

Abstract: Purpose: A 32-channel parallel transmit (pTx) add-on for 7 Tesla whole-body imaging is presented. First results are shown for phantom and in-vivo imaging. Methods: The add-on system consists of a large number of hardware components, including modulators, amplifiers, SAR supervision, peripheral devices, a control computer, and an integrated 32-channel transmit/receive body array. B1+ maps in a phantom as well as B1+ maps and structural images in large volunteers are acquired to demonstrate the functionality of the system. EM simulations are used to ensure safe operation. Results: Good agreement between simulation and experiment is shown. Phantom and in-vivo acquisitions show a field of view of up to 50 cm in z-direction. Selective excitation with 100 kHz sampling rate is possible. The add-on system does not affect the quality of the original single-channel system. Conclusion: The presented 32-channel parallel transmit system shows promising performance for ultra-high field whole-body imaging.

Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0222452

DOI: 10.1371/journal.pone.0222452

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