| Pyrolytic graphite foam: a passive magnetic susceptibility matching material. | |
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MedLine Citation:
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PMID: 20815067 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To evaluate a novel soft, lightweight cushion that can match the magnetic susceptibility of human tissue. The magnetic susceptibility difference between air and tissue produces field inhomogeneities in the B(0) field, which leads to susceptibility artifacts in magnetic resonance imaging (MRI) studies. MATERIALS AND METHODS: Pyrolytic graphite (PG) microparticles were uniformly embedded into a foam cushion to reduce or eliminate field inhomogeneities at accessible air and tissue interfaces. 3T MR images and field maps of an air/water/PG foam phantom were acquired. Q measurements on a 4T tuned head coil and pulse sequence heating tests at 3T were also performed. RESULTS: The PG foam improved susceptibility matching, reduced the field perturbations in phantoms, does not heat, and is nonconductive. CONCLUSION: The susceptibility matched PG foam is lightweight, safe for patient use, adds no noise or MRI artifacts, is compatible with radiofrequency coil arrays, and improves B(0) homogeneity, which enables more robust MR studies. |
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Authors:
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Gary C Lee; Patrick W Goodwill; Kevin Phuong; Ben A Inglis; Greig C Scott; Brian A Hargreaves; Lizabeth Li; Alex C Chen; Rachana N Shah; Steven M Conolly |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of magnetic resonance imaging : JMRI Volume: 32 ISSN: 1522-2586 ISO Abbreviation: J Magn Reson Imaging Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-09-03 Completed Date: 2011-01-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9105850 Medline TA: J Magn Reson Imaging Country: United States |
Other Details:
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Languages: eng Pagination: 684-91 Citation Subset: IM |
Affiliation:
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Berkeley/UCSF Bioengineering Joint Graduate Group, University of California, Berkeley, California 94720, USA. glee@berkeley.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts Carbon / chemistry* Echo-Planar Imaging / methods Humans Image Enhancement / methods Imaging, Three-Dimensional Magnetic Resonance Imaging / methods* Materials Testing Models, Structural Phantoms, Imaging* Sensitivity and Specificity Viscoelastic Substances / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Viscoelastic Substances; 0/pyrolytic carbon; 7440-44-0/Carbon |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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