Comparison of light intensity on the brain surface due to laser exposure during optical topography and solar irradiation.

Comparison of light intensity on the brain surface due to laser exposure during optical topography and solar irradiation. Research Abstract Details 

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Comparison of light intensity on the brain surface due to laser exposure during optical topography and solar irradiation. Abstract Text:

Masashi Kiguchi,Noriyoshi Ichikawa,Hirokazu Atsumori,Fumio Kawaguchi,Hiroki Sato,Atsushi Maki,Hideaki Koizumi,

Optical topography (OT), which is based on the near-infrared spectroscopy, is a powerful tool for observing brain activity noninvasively. To estimate the effect of laser exposure on the brain, photon-distribution profiles in bald heads of adults and neonates during the OT were calculated using the photon-diffusion equation. These calculations showed that although the absolute values of the intensity depend on details of the head model, the relative values of OT exposure to sunlight exposure were less sensitive to the model details. As an example, the light intensities on the brain surface during OT obtained by using a commercially available system were about 2% for adults and 3% for neonates of those values obtained under midday sunlight on a sunny day in midsummer. These values were obtained under the reasonable assumptions with a large safety factor.

Comparison of light intensity on the brain surface due to laser exposure during optical topography and solar irradiation. Publishing Authors By Initials

M Kiguchi,N Ichikawa,H Atsumori,F Kawaguchi,H Sato,A Maki,H Koizumi,

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PUBMED ID PMID:

MEDLINE DATE: 2007 Nov-Dec

Comparison of light intensity on the brain surface due to laser exposure during optical topography and solar irradiation. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biomedical optics

VOLUME: 12

Page Numbers: 062108

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ISSN: 1083-3668

DAY: 31

MONTH: 12

YEAR: 2007

Comparison of light intensity on the brain surface due to laser exposure during optical topography and solar irradiation. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Comparison of light intensity on the brain surface due to laser exposure during optical topography and solar irradiation.

AFFILIATION: Hitachi, Ltd., Advanced Research Laboratory, Hatoyama, Saitama 350-0395, Japan and Tokyo Institute of Technology, Graduate School of Science and Engineering, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan.

Country: United States

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MEDLINETA: J Biomed Opt

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