Comparative study of reflectance spectra for human Laogong acupoint and non-acupoint tissues irradiated by laser

Zude Zhang; Zhouyi Guo; Huajiang Wei; Huiqing Zhong; Hongqin Yang; Shusen Xie; Songhao Liu

doi:10.1117/12.821488

6 March 2009 Comparative study of reflectance spectra for human Laogong acupoint and non-acupoint tissues irradiated by laser

Zude Zhang, Zhouyi Guo, Huajiang Wei, Huiqing Zhong, Hongqin Yang, Shusen Xie, Songhao Liu

Author Affiliations +

Proceedings Volume 7280, Seventh International Conference on Photonics and Imaging in Biology and Medicine; 72802Q (2009) https://doi.org/10.1117/12.821488
Event: Photonics and Optoelectronics Meetings, 2008, Wuhan, China

Abstract

Reflection spectra of human Laogong acupoint (PC8) and non-acupoint tissue which irradiated by different power were studied in the spectral range from 400 nm to 1000 nm in vivo. A wavelength of 808 nm semiconductor laser was used for irradiation at the power of 0 mw (empty irradiation), 20 mw, 50 mw and 100 mw for ten minutes. Reflection spectra were measured with an AvaSpec-2048 optical fiber spectroscopy with an integrating sphere attachment. The result shows that when empty irradiated, the shape of the reflectance spectra of Laogong acupoint and non-acupoint are similar, they have the same troughs at 423 nm, 544 nm, 577 nm and 980 nm, the reflectance at these wavelengths for Laogong acupoint are 17.1%, 26.1%, 25.9%, 35.0%, and for non-acupoint are 17.1%, 27.6%, 28.1%, 36.5%. But from 475 nm to 1000 nm, the reflectance of Laogong acupoint is smaller than that of non-acoupoint. After irradiated by laser at the power of 20 mw, 50 mw, and 100 mw, there is a very significant decrease in the reflectance spectra of Laogong acupoint comparing to that of empty irradiated, and the higher power, the lower reflectance. But there is just a small decrease in the reflectance spectra of non-acupoint comparing to that of empty irradiated. From the above results, it is clearly to see that Laogong acupoint is more sensitive than non-acupoint when irradiated by semiconductor laser.

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Zude Zhang, Zhouyi Guo, Huajiang Wei, Huiqing Zhong, Hongqin Yang, Shusen Xie, and Songhao Liu "Comparative study of reflectance spectra for human Laogong acupoint and non-acupoint tissues irradiated by laser", Proc. SPIE 7280, Seventh International Conference on Photonics and Imaging in Biology and Medicine, 72802Q (6 March 2009); https://doi.org/10.1117/12.821488

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KEYWORDS

Reflectivity

Tissues

Integrating spheres

Medicine

Optical fibers

Semiconductor lasers

In vivo imaging

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