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


Autoři: Stephan Orzada aff001;  Klaus Solbach aff002;  Marcel Gratz aff001;  Sascha Brunheim aff001;  Thomas M. Fiedler aff004;  Sören Johst aff001;  Andreas K. Bitz aff004;  Samaneh Shooshtary aff002;  Ashraf Abuelhaija aff002;  Maximilian N. Voelker aff001;  Stefan H. G. Rietsch aff001;  Oliver Kraff aff001;  Stefan Maderwald aff001;  Martina Flöser aff004;  Mark Oehmigen aff003;  Harald H. Quick aff001;  Mark E. Ladd aff001
Působiště autorů: Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany aff001;  RF & Microwave Technology, University of Duisburg-Essen, Duisburg, Germany aff002;  High-Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany aff003;  Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany aff004;  Electromagnetic Theory and Applied Mathematics, Faculty of Electrical Engineering and Information Technology, FH Aachen – University of Applied Sciences, Aachen, Germany aff005;  Faculty of Physics and Astronomy and Faculty of Medicine, University of Heidelberg, Heidelberg, Germany aff006
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0222452

Souhrn

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.

Klíčová slova:

Medicine and health sciences – Diagnostic medicine – Diagnostic radiology – Magnetic resonance imaging – Radiology and imaging – Research and analysis methods – Imaging techniques – In vivo imaging – Engineering and technology – Signal processing – Signal amplification – Modulation – Electronics engineering – Logic circuits – Electronics – Capacitors – Physical sciences – Materials science – Materials – Magnets – Social sciences – Economics – Commerce – Vendors


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