not-yet-known not-yet-known not-yet-known unknown Figure 2. System setup for measurements at (A) the biochemical validation stage and (B) the histopathological validation stage. (An aluminum tape in the picture fixed the reusable tip, so its relative position to the probe did not change.) (C). Laser spot size measurement using a ruler on an infrared viewer card. The distances (which is the distance from the probe head to the front surface of the first collecting lens) from the liver specimens and the card to the front lens inside the probe were consistent. \[PD=\frac{P}{\pi{(\frac{d}{2})}^{2}}=\frac{150\ mW}{\pi{(\frac{1.5\text{\ mm}}{2})}^{2}}\approx 8.5\ mW/cm^{2}\]