Fig. 4
From: Recovering the superficial microvascular pattern via diffuse reflection imaging: phantom validation
a A 2-D planar imaging of optical density arranged to their corresponding position in the coordinate of scanning scheme. b An OD-wavelength spectra showing the contrast of of the optical density between over around the scattering matrix (blue curve) and vessel included with hemoglobin solution (red curve), the red curve shows a lower value of optical density with the wavelength dependency, as the hemoglobin absorbs more light