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Special Issue "High Field Magnetic Resonance Methods and Materials 2013"

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

Deadline for manuscript submissions: closed (31 October 2013)

Special Issue Editor

Guest Editor
Prof. Dr. N. Jon Shah

Institute of Neuroscience and Medicine, Forschungszentrum Juelich GmbH, 52425 Juelich, Germany
Website | E-Mail
Phone: +49 2461 61 6836
Fax: +49 2461 61 1919
Interests: ultra-high field MRI; hybrid MR-PET; metabolic imaging; non-proton imaging; quantitative MRI; MRI sequence development

Special Issue Information

Materials (ISSN 1996-1944) is an Open Access journal, which is free to access and read on the Internet. MDPI guarantees that no university library or individual reader will ever have to buy a subscription or buy access through pay-per-view fees to access the articles published in the journal. Hence, MDPI does not have any income from selling subscriptions to the print or online version of this journal or from pay-per-view fees. In order to cover the costs of providing and maintaining a publication infrastructure, managing the journals, and processing the manuscripts through peer-review and the editorial procedure, the journal uses a form of conditional submission fee referred to as Article Processing Charge (APC).

For Materials (ISSN 1996-1944), authors are asked to pay a fee of 1400 CHF (Swiss Francs) per processed paper, but only if the article is accepted for publication in this journal after peer-review and possible revision of the manuscript. Note that many national and private research funding organizations and universities explicitly cover such fees for articles originated in funded research projects. Discounts are available for authors from institutes that participate with MDPI's membership program.

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Published Papers (1 paper)

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Research

Open AccessArticle Gain of Imaging Fidelity by Employing a Higher Number of Independent Transmit Channels Together with Slice-Selective Radio-Frequency (RF) Shimming at 7T
Materials 2014, 7(1), 30-43; doi:10.3390/ma7010030
Received: 24 September 2013 / Revised: 29 November 2013 / Accepted: 16 December 2013 / Published: 20 December 2013
PDF Full-text (640 KB) | HTML Full-text | XML Full-text
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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