Figure 1.

Absorbance plot of Silcast 815, the silicone used in this work. It was measured without silicone fluid (black solid line) and for three different concentrations of the diluting fluid, namely 20%, 40% and 60% (weight percentage). No significant differences occur for these concentrations. Thus, only the curve for 60% (solid red) is shown, since it corresponds to the one which best reproduces the stiffness of a real breast. An absorption peak at 900 nm can be clearly seen.