The Forward Problem Algorithm Based on Monte Carlo Method for Diffusion Optical Tomography

In the medical field, abnormal tissues such as tumours or other foreign bodies often affect absorption coefficient in subcutaneous. First, photons are injected into skin, leading to diffusion behaviours, and then diffused light intensity on a specific location is measured. Next, foreign material distribution within the detection region is reconstructed by a specific weighting method for diagnosis. This study proposed a method of simulating photons’ behaviours in subcutaneous tissues to obtain the distribution of surface intensity. Also, with assumed source location and detection location, a specific weighting method is used to calculate foreign body distribution.