| Effects of neuronal magnetic fields on MRI: numerical analysis with axon and dendrite models. | |
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MedLine Citation:
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PMID: 17291782 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Whether the neuronal magnetic fields (NMFs) could cause measurable MRI signal changes in the human brain seems to be still controversial. In this study, we have numerically investigated the NMF effects on the MRI signal using two separate current source models for axons and dendrites. Since intracellular current distributions are different in axons and dendrites, the NMFs emanating from axons and dendrites are also very different from each other. Due to the quadripole configuration of the intracellular current flowing through an axon, the axonal magnetic field is bipolar causing virtually no changes in the MRI signal. On the contrary, the dendritic magnetic field is unipolar so that its effects can be accumulated during the echo time. The dendritic magnetic field has measurable effects on the MRI signal, but, it is necessary to differentiate the NMF effects from much bigger background BOLD effects to utilize the NMF effects for fMRI. |
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Authors:
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Tae Seok Park; Soo Yeol Lee |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2007-01-10 |
Journal Detail:
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Title: NeuroImage Volume: 35 ISSN: 1053-8119 ISO Abbreviation: Neuroimage Publication Date: 2007 Apr |
Date Detail:
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Created Date: 2007-03-19 Completed Date: 2007-06-04 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9215515 Medline TA: Neuroimage Country: United States |
Other Details:
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Languages: eng Pagination: 531-8 Citation Subset: IM |
Affiliation:
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Department of Biomedical Engineering, Kyung Hee University, 1 Seochun, Kiheung, Yongin, Kyungki 446-701, South Korea. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Axons
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physiology* Dendrites / physiology* Electromagnetic Fields* Magnetic Resonance Imaging* Mathematics Models, Neurological* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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