| Off-resonance magnetisation transfer contrast (MTC) MRI using fast field-cycling (FFC). | |
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MedLine Citation:
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PMID: 20188612 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Magnetisation transfer contrast (MTC) is an important MR contrast generating mechanism to characterise the undetectable bound protons indirectly using the decreased signal intensity of the observable free protons. MTC imaging typically employs a range of off-resonance RF pre-saturation pulse with maintaining the RF magnetic field (B(1)) at a specified value. However, this presents a technical difficulty, particularly at low field, because the larger offset frequencies tend to be outside the bandwidth of the RF transmit system, causing B(1) to vary with the frequency offset. Here, we demonstrate a novel off-resonance irradiation method using fast field-cycling which allows switching of the external magnetic field between several chosen strengths, while holding constant the RF frequency and B(1) level. This permits one to avoid the problem of B(1) variation as a function of frequency offset. The results obtained by this new technique are in excellent agreement with those obtained by the conventional technique. |
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Authors:
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Chang-Hoon Choi; Gareth R Davies; David J Lurie |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-02-10 |
Journal Detail:
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Title: Journal of magnetic resonance (San Diego, Calif. : 1997) Volume: 204 ISSN: 1096-0856 ISO Abbreviation: J. Magn. Reson. Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-04-05 Completed Date: 2010-07-16 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9707935 Medline TA: J Magn Reson Country: United States |
Other Details:
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Languages: eng Pagination: 145-9 Citation Subset: IM |
Copyright Information:
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Copyright 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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Biomedical Physics, Aberdeen Biomedical Imaging Centre, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, UK. changhoon.choi@abdn.ac.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms* Contrast Media* Image Enhancement / methods* Image Interpretation, Computer-Assisted / methods* Magnetic Resonance Imaging / instrumentation, methods* Phantoms, Imaging |
| Chemical | |
Reg. No./Substance:
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0/Contrast Media |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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