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. 2013 Apr;31(4):163-8.
doi: 10.1089/pho.2012.3284. Epub 2013 Feb 26.

Penetration of laser light at 808 and 980 nm in bovine tissue samples

Donald E Hudson  1 , Doreen O Hudson, James M Wininger, Brian D Richardson
Affiliations

Penetration of laser light at 808 and 980 nm in bovine tissue samples

Donald E Hudson et al. Photomed Laser Surg. 2013 Apr.

Abstract

Objective: The purpose of this study was to compare the penetration of 808 and 980 nm laser light through bovine tissue samples 18-95 mm thick.

Background data: Low-level laser therapy (LLLT) is frequently used to treat musculoskeletal pathologies. Some of the therapeutic targets are several centimeters deep.

Methods: Laser light at 808 and 980 nm (1 W/cm(2)) was projected through bovine tissue samples ranging in thickness from 18 to 95 mm. Power density measurements were taken for each wavelength at the various depths.

Results: For 808 nm, 1 mW/cm(2) was achieved at 3.4 cm, but for 980 nm, 1 mW/cm(2) was achieved at only 2.2 cm depth of tissue.

Conclusions: It was determined that 808 nm of light penetrates as much as 54% deeper than 980 nm light in bovine tissue.

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Figures

FIG. 1.
FIG. 1.
Top-hat light pattern before entering tissue sample.
FIG. 2.
FIG. 2.
Configuration for components for two- and three-dimensional pictures of laser light exiting meat sample.
FIG. 3.
FIG. 3.
Laser light two-dimensional pattern.
FIG. 4.
FIG. 4.
Laser light three-dimensional pattern.
FIG. 5.
FIG. 5.
Actual and predictive power dentisty measurements of 808 and 980 nm light.
FIG. 6.
FIG. 6.
Laser light pattern 808 nm at 3.3 cm tissue depth.
FIG. 7.
FIG. 7.
Laser light pattern 980 nm at 2.8 cm tissue depth.
See this image and copyright information in PMC

References

    1. Byrnes K. R. Waynant R. W. Ilve I. K. Wu X. Barna L. Smith K. Heckert R. Gerst H. Anders J.J. Light promotes regeneration and functional recovery and alters the immune response after spinal cord injury. Lasers Surg. Med. 2005;36:171–185. - PubMed
    1. Cilesiz I.F. Welch A. J. Light dosimetry: effects of dehydration and thermal damage on the optical properties of the human aorta. Appl. Opt. 1993;32:477–487. - PubMed
    1. Niemz M. H. Laser-tissue interaction. Berlin, Heidelberg, New York: Springer-Verlag; 2007. ,

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