NIR light penetration depth in the rat peripheral nerve and brain cortex

Document Type

Conference Proceeding

Publication Date

12-1-2007

Abstract

Near infrared (NIR) light energy has been used in medical applications both for diagnostic and treatment purposes. A priory knowledge of optical tissue properties is necessary in these applications; not only of human but also in animals for testing of devices. However, published data on the optical properties of neural tissue in rodents are rare. The aim of this study was to measure the penetration depth of light into the rat peripheral nerve and brain cortex at NIR wavelengths. Penetration depth was calculated from measurements of transmitted light for various thicknesses of the neural tissue. We found the penetration depth in the rat sciatic nerve to be 0.35±0.023mm and in the white matter 0.35±0.026mm. The penetration depth of the gray matter was 0.41±0.029mm. Compared to the data reported in literature for the human brain, the rat peripheral and the brain cortex attenuate the NIR light much more strongly. © 2007 IEEE.

Identifier

57649194924 (Scopus)

ISBN

[1424407885, 9781424407880]

Publication Title

Annual International Conference of the IEEE Engineering in Medicine and Biology Proceedings

External Full Text Location

https://doi.org/10.1109/IEMBS.2007.4352642

ISSN

05891019

PubMed ID

18002308

First Page

1723

Last Page

1725

Grant

R21NS050757

Fund Ref

National Institute of Neurological Disorders and Stroke

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