Figure 6: A, Schematic representation of the phantom experiment. A capillary, filled with human blood, was placed under three stair-wise stacked TiO2-silicone phantoms of 100 μm each. Each phantom contained a 0.2% TiO2 concentration representing a scattering value of 4 mm-1 at 700 nm. The wholephantom-capillary stack was illuminated with the SPIES endoscope. The endoscope was placed 5 cm above the stack. The resulted image shows anenface image with increased layer thickness as schematically shown in 6B. This allows measurement of contrast differences caused by absorbance fordifferent depths.