Diffuse reflection on the acupuncture point under laser acupuncture with different spatial distribution

In order to study the diffuse transmission influence of laser acupuncture with different surface distribution light sources,the image-point-source distribution on meridian tissue is analyzed and diffusion equation of the image-point-source is solved through the use of extrapolation boundary conditions and Green response.Diffuse output models in acupuncture region for different distribution surface light source are obtained by a series responses of virtual points source.Flat,fiber and gauss acupuncture laser are simulated by Monte-Carlo method.The results indicated that; (1) the radial light energy in three acupuncture without spot mainly was concentrated in the near light source region and coincided when the radial distance to more than 0.135 cm,and axial light energy showed a negative exponential decay in flat and gauss acupuncture and linear decline in fiber source; (2) when surface light source existed circular or ring spot,the diffuse was inversely proportional to the spot area, especially the diffuse of circular spot being larger than the ring spot under the same spot area,and diffuse reflectance curve had a significant distortion at the vertical projection and was inversely proportional to the distance outside the projection,especially when the distance to 0.5 times of the spot radius the curve distortion being basically eliminated.The results may provide a useful reference for light source selection and acupuncture location of acupuncture points.