| Low magnetic moment PIN diodes for high field MRI surface coils. | |
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MedLine Citation:
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PMID: 17278801 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Positive-intrinsic-negative (PIN) silicon diodes are commonly used in magnetic resonance imaging (MRI) coils to perform active or passive blocking and detuning, or to disable circuit functions. However, diode packages with large magnetic moments are known to cause image artifacts in high field MRI systems. In this study, diode packages with low magnetic moment were designed by compensating components of ferromagnetic nickel and paramagnetic tungsten with diamagnetic silver. The new diodes have an initial positive susceptibility up to fields of 1 T and a negative susceptibility from 1 to 7 T. Their magnetic moments are one to two orders of magnitude smaller than those of standard diodes; moments as small as 20 nJ/T at 7 T were achieved. |
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Authors:
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Pavel Voskoboynik; Ronald D Joos; W E Doherty; Ron B Goldfarb |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Medical physics Volume: 33 ISSN: 0094-2405 ISO Abbreviation: Med Phys Publication Date: 2006 Dec |
Date Detail:
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Created Date: 2007-02-06 Completed Date: 2007-04-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0425746 Medline TA: Med Phys Country: United States |
Other Details:
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Languages: eng Pagination: 4499-501 Citation Subset: IM |
Affiliation:
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Microsemi Corporation, Lowell, Massachusetts 01851, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts Electromagnetic Fields Equipment Design Image Processing, Computer-Assisted Magnetic Resonance Imaging / instrumentation*, methods* Magnetics Nickel / chemistry Silver / chemistry Temperature Tungsten / chemistry |
| Chemical | |
Reg. No./Substance:
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7440-02-0/Nickel; 7440-22-4/Silver; 7440-33-7/Tungsten |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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