| Active magnetic shielding for biomagnetic measurement using spatial gradient fields. | |
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MedLine Citation:
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PMID: 14509304 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Biomagnetic measurement performed outside a magnetically shielded room is subject to distortion by strong magnetic fields. Reducing such disturbances can enhance and stabilize biomagnetic measurement conditions in the absence of passive shielding. We have developed an active magnetic shielding system that produces both homogeneous and spatial gradient magnetic fields. The system is composed of anisotropic magnetoresistive sensors, a digital signal processor controller and two different coil systems. In order to improve the measurement environment for a first-order gradient coil SQUID system, the disturbing vertical magnetic fields and vertical field gradients are reduced, thus achieving a shielding factor of approximately 6 at 100 Hz. Our system provides a more flexible and less costly alternative to magnetically shielded rooms. |
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Authors:
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B Hilgenfeld; E Strähmel; H Nowak; J Haueisen |
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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: Physiological measurement Volume: 24 ISSN: 0967-3334 ISO Abbreviation: Physiol Meas Publication Date: 2003 Aug |
Date Detail:
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Created Date: 2003-09-25 Completed Date: 2004-04-28 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 9306921 Medline TA: Physiol Meas Country: England |
Other Details:
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Languages: eng Pagination: 661-9 Citation Subset: IM |
Affiliation:
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Biomagnetic Center, Department of Neurology, Friedrich Schiller University Jena, Germany. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts Cost Savings Electromagnetic Fields* Electromagnetic Phenomena / economics, instrumentation* Heart / physiology* Humans Magnetics / instrumentation* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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