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

摘要

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.