| Noninvasive magnetic detection of cardiac mechanical activity: experiments. | |
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MedLine Citation:
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PMID: 7393157 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The magnetic susceptibility of the heart and the intracardiac blood is substantially greater than that of the surrounding lung tissue. The periodic redistribution of blood and tissue during the cardiac cycle will thus alter an externally applied magnetic field. These magnetic field changes can be detected by a magnetometer outside the body, and have been termed magnetic susceptibility plethysmography (MSPG) signals. A differential magnetometer, a liquid helium dewar, and a superconducting persistent-current magnet have been developed to detect the x component of the MSPG signal. The theoretical analysis of this instrument is presented to understand the spatial sensitivity of an MSPG susceptometer with a nonuniform magnetizing field. Preliminary measurements are shown to be in fair agreement with the model calculations. Several possible improvements of the technique are discussed. |
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Authors:
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J P Wikswo; J E Opfer; W M Fairbank |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Medical physics Volume: 7 ISSN: 0094-2405 ISO Abbreviation: Med Phys Publication Date: 1980 Jul-Aug |
Date Detail:
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Created Date: 1980-09-28 Completed Date: 1980-09-28 Revised Date: 2006-11-15 |
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: 307-14 Citation Subset: IM |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Cardiography, Impedance* / instrumentation Humans Magnetics* Male Plethysmography, Impedance* / instrumentation |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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