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

Author

Listed:
  • 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
  • Mark E Ladd

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.

Suggested Citation

  • 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 &, 2019. "A 32-channel parallel transmit system add-on for 7T MRI," PLOS ONE, Public Library of Science, vol. 14(9), pages 1-20, September.
    • Handle: RePEc:plo:pone00:0222452
    DOI: 10.1371/journal.pone.0222452
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