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

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. The add-on system consists of a large number of hardware components, including modulators, amplifiers, SAR supervision, peripheral devices, a control comp...

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Bibliographic Details
Published in:PloS one 2019-09, Vol.14 (9), p.e0222452-e0222452
Main Authors: Orzada, Stephan, Solbach, Klaus, Gratz, Marcel, Brunheim, Sascha, Fiedler, Thomas M, Johst, Sören, Bitz, Andreas K, Shooshtary, Samaneh, Abuelhaija, Ashraf, Voelker, Maximilian N, Rietsch, Stefan H G, Kraff, Oliver, Maderwald, Stefan, Flöser, Martina, Oehmigen, Mark, Quick, Harald H, Ladd, Mark E
Format: Article
Language:English
Subjects:
Amplifiers
Arrays
Cancer
Computer simulation
Efficiency
Engineering and Technology
Equipment Design
Feasibility studies
Field of view
Ghosts
Health physics
Humans
Image acquisition
Magnetic fields
Magnetic resonance imaging
Magnetic Resonance Imaging - instrumentation
Magnetic Resonance Imaging - methods
Medical research
Medicine
Medicine and Health Sciences
Modulators
NMR
Nuclear magnetic resonance
Peripheral equipment (computers)
Phantoms, Imaging
Physical Sciences
Physics
Quality control
Research and Analysis Methods
Signal-To-Noise Ratio
Social Sciences
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Description
Summary: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. 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. 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. The presented 32-channel parallel transmit system shows promising performance for ultra-high field whole-body imaging.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0222452