Share Email Print

Journal of Biomedical Optics

Comparison of light intensity on the brain surface due to laser exposure during optical topography and solar irradiation
Author(s): Masashi Kiguchi; Noriyoshi Ichikawa; Hirokazu Atsumori; Fumio Kawaguchi; Hiroki Sato; Atsushi Maki; Hideaki Koizumi
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

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.

Paper Details

Date Published: 1 November 2007
PDF: 7 pages
J. Biomed. Opt. 12(6) 062108 doi: 10.1117/1.2804152
Published in: Journal of Biomedical Optics Volume 12, Issue 6
Show Author Affiliations
Masashi Kiguchi, Hitachi, Ltd. (Japan)
Noriyoshi Ichikawa, Hitachi Medical Corp. (Japan)
Hirokazu Atsumori, Hitachi, Ltd. (Japan)
Fumio Kawaguchi, Hitachi Medical Corp. (Japan)
Hiroki Sato, Hitachi, Ltd. (Japan)
Atsushi Maki, Hitachi, Ltd. (Japan)
Hideaki Koizumi, Hitachi, Ltd. (Japan)

© SPIE. Terms of Use
Back to Top