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Updated: Jan 19, 2026

Transmitting Plant Viruses Using Whiteflies
Published on: November 8, 2013
A 32-channel parallel transmit system add-on for 7T MRI
Stephan Orzada1, Klaus Solbach2, Marcel Gratz1,3
1Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
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.
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