| Induced magnetic force in human heads exposed to 4 T MRI. | |
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MedLine Citation:
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PMID: 20373424 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To map the distribution of the magnetic force induced in the human head during magnetic resonance imaging (MRI) at 4 T for a large group of healthy volunteers. MATERIALS AND METHODS: The magnetic field distribution in the head of 100 men and 18 women was mapped using phase mapping techniques. Statistical parametric mapping methods using a family-wise error (FWE) corrected threshold P < 0.05 and region-of-interest analyses were used to assess the significance of the results. RESULTS: Eyeballs, orbitofrontal and temporal cortices, subcallosal gyrus, anterior cingulate, midbrain, and brainstem (pons) are the brain regions most susceptible to magnetic force. The strength of the magnetic force density in the head was lower than 11.5 +/- 5.3 N/m(3) (right eyeball). The strength of the magnetic force density induced in occipital cortex varied linearly with the x-rotation (pitch) angle. CONCLUSION: We found that the induced magnetic force is highly significant in the eyeballs, orbitofrontal and temporal cortices, subcallosal gyrus, anterior cingulate as well as midbrain and brainstem (pons), regardless of subjects' age or gender. The maximum induced magnetic force was 6 x 10(5) times weaker than the gravitational force; thus, biological effects of the magnetic force during imaging are not expected to be significant. |
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Authors:
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Ruiliang Wang; Gene-Jack Wang; Rita Z Goldstein; Elisabeth C Caparelli; Nora D Volkow; Joanna S Fowler; Dardo Tomasi |
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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: Journal of magnetic resonance imaging : JMRI Volume: 31 ISSN: 1522-2586 ISO Abbreviation: J Magn Reson Imaging Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-04-07 Completed Date: 2010-10-14 Revised Date: 2011-07-27 |
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: 815-20 Citation Subset: IM |
Copyright Information:
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(c) 2010 Wiley-Liss, Inc. |
Affiliation:
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Medical Department, Brookhaven National Laboratory, Upton, New York 11973, USA. rlwang@bnl.gov |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Brain / pathology, radiation effects Electromagnetic Fields* Female Gravitation Head / radiation effects* Humans Magnetic Resonance Imaging / adverse effects, methods* Magnetics* Male Middle Aged |
| Grant Support | |
ID/Acronym/Agency:
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ZIA AA000550-06/AA/NIAAA NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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