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

GND
1202519121
ORCID
0000-0001-9784-4354
LSF
58645
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Orzada, Stephan;
GND
138146225
LSF
1301
Affiliation
RF & Microwave Technology, University of Duisburg-Essen, Duisburg, Germany.
Solbach, Klaus;
GND
1022940511
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Gratz, Marcel;
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Brunheim, Sascha;
GND
1168820022
Affiliation
Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.
Fiedler, Thomas M.;
GND
1126126489
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Johst, Sören;
Affiliation
Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.
Bitz, Andreas K.;
GND
1162284307
LSF
54414
Affiliation
RF & Microwave Technology, University of Duisburg-Essen, Duisburg, Germany.
Shooshtary, Samaneh;
GND
1115822845
Affiliation
RF & Microwave Technology, University of Duisburg-Essen, Duisburg, Germany.
Abuelhaija, Ashraf;
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Voelker, Maximilian N.;
GND
120044485X
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Rietsch, Stefan H. G.;
GND
1202526829
LSF
58642
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Kraff, Oliver;
GND
137406738
LSF
58643
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Maderwald, Stefan;
Affiliation
Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.
Flöser, Martina;
ORCID
0000-0001-5023-5105
Affiliation
High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany.
Oehmigen, Mark;
GND
124361897
LSF
47417
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Quick, Harald H.;
GND
108120964X
LSF
29716
Affiliation
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Ladd, Mark E.

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.

Cite

Citation style:
Orzada, S., Solbach, K., Gratz, M., Brunheim, S., Fiedler, T.M., Johst, S., Bitz, A.K., Shooshtary, S., Abuelhaija, A., Voelker, M.N., Rietsch, S.H.G., Kraff, O., Maderwald, S., Flöser, M., Oehmigen, M., Quick, H.H., Ladd, M.E., 2019. A 32-channel parallel transmit system add-on for 7T MRI. https://doi.org/10.1371/journal.pone.0222452
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