Fig. 1
From: Tissue diagnosis during colorectal cancer surgery using optical sensing: an in vivo study
Basic principle of DRS. Light, with a broad wavelength range, is send through a fiber to the tissue. Within the tissue this light undergoes several interactions like scattering (blue arrows) and absorption (red arrows). Part of the light will be scattered to the surface where it is detected using a second fiber. The detected signal will be different than the signal that was send into the tissue due to the specific absorption of the tissue constituents. Based on the signal alterations different tissue types can be discriminated