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High Field Magnetic Resonance Methods and Materials 2013

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 October 2013) | Viewed by 6044

Special Issue Editor

1. Institute of Neuroscience and Medicine 4, INM-4, Forschungszentrum Jülich, Germany
2. Institute of Neuroscience and Medicine 11, INM-11, JARA, Forschungszentrum Jülich, Germany
3. JARA - BRAIN - Translational Medicine, Aachen, Germany
4. Department of Neurology, RWTH Aachen University, Aachen, Germany
Interests: ultra-high field MRI; hybrid MR-PET; metabolic imaging; non-proton imaging; quantitative MRI; MRI sequence development
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Article
Gain of Imaging Fidelity by Employing a Higher Number of Independent Transmit Channels Together with Slice-Selective Radio-Frequency (RF) Shimming at 7T
by Niravkumar Darji, Gopesh Patel and Oliver Speck
Materials 2014, 7(1), 30-43; https://doi.org/10.3390/ma7010030 - 20 Dec 2013
Cited by 42 | Viewed by 5813
Abstract
Dielectric resonance effects and radio-frequency (RF) power deposition have become challenging issues for magnetic resonance imaging at ultrahigh-field (UHF) strengths. The use of transmit (Tx) coil arrays with independently-driven RF sources using a parallel transmission system is a promising method for alleviating the [...] Read more.
Dielectric resonance effects and radio-frequency (RF) power deposition have become challenging issues for magnetic resonance imaging at ultrahigh-field (UHF) strengths. The use of transmit (Tx) coil arrays with independently-driven RF sources using a parallel transmission system is a promising method for alleviating the resulting RF inhomogeneities. In this study, the effect on homogeneity and RF-power when employing a higher number of transmit channels with multi-slice acquisition in vivo at high field strength (7T) is scrutinized. An 8-channel head coil array was driven to emulate circular polarized (CP) and 2-, 4-, and 8-channel independent transmit configurations at 7T. Static RF shimming was employed on human subjects in order to homogenize the B1+ field in the excited volume. Slice-selective and global RF shimming methods were applied with CP and 2-, 4-, and 8-channel transmit channel configurations. RF shimming was performed from CP to 2-, 4-, and 8-channel Tx configurations globally and slice-selectively. Systematic improvement in B1+ homogeneity and/or reduction in RF-power were observed. RF shimming in the human brain with 8-channel transmit and slice-selective shimming yields an increase in B1+ homogeneity of 43% and/or reduces RF-power by 68% when compared with CP global RF shimming at 7T. Full article
(This article belongs to the Special Issue High Field Magnetic Resonance Methods and Materials 2013)
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