Interference Spectral Type OCT System Of Photoelectric Information Characteristic Simulation Research

The interference optical tomography system was established on the combining of optical coherence tomography and interference theory which use the same hardware core with Michelson interferometer. This system can be used to acquire spectral information and three-dimensional tomographic images of high scattering samples; It also takes full advantage of coherence tomography’s non-invasive, high spatial resolution, high sensitivity, high spectral resolution and multi-channel property as of an interference spectral technique.The dissertation is mainly focused on the followings.(1)In this paper we discussed basic principles of the interference spectral properties OCT system, structure and functioning characteristics. Also, introduction was made about tomography technology based on the principle of the Michelson interferometer optical coherence imaging and also about principles of Fourier transform spectroscopy. Moreover, the feasibility of combining of these two was demonstrated theoretically.(2)Many factors will affect the scanning speed of interfere spectral OCT system. Via comparative analysis with traditional stepper motor driven scanning, this article focuses on the fast scanning delay line scan mode and the fast line scanning technology.(3) Research the transmission characteristics of photons in biological tissue and stablish of a Monte Carlo model based on human skin tissue(4)This present paper use Monte Carlo simulation for simulated the transmission characteristics of photon in skin tissue in Matlab software based on human skin tissue model, which research the diffuse reflection and energy absorbing of light in the skin tissue.The calculation results show that the larger μα of absorption coefficient, the greater gradient of energy decay and initial value of the A(z) in the muscle layer, as well as the smaller the R(r), while remaining the rest of the parameters unchanged. As increasing μs of scattering coefficient, the initial value of A(z) and the gradient of energy decay in the muscle layer become stronger, moreover, each gradients of R(r) with different μs are almost the same. While the greater g of anisotropy factor in the muscle layer, the smaller initial value of A(z), which means that the absorption of photons hardly happen, and the smaller R(r). The influence degrees of R(r) from the above three types of optical parameters are similar, and every curves of R(r) presents similar and high gradient in the radius range of0.05cm.The epidermis and dermis layer is the focus of the study because of the probing depth of OCT system is2～3mm, so there simulated the transmission characteristics of photon in upper layer of skin tissue. The curves of the diffuse reflection and energy absorbing of light in upper layer of the skin tissue were obtained for Change the parameters of the epidermis and dermis layer, and the result was analyzed. It laid a theoretical foundation for the interference spectral type OCT system and bio-medical diagnostic technology.