Optical surgical system having light sensor on its jaw and method for determining vessel size with angular distortion compensation

An optical surgical system with compensation for angular distortions, the system comprising:

• a plurality of light emitters disposed at a working end of a surgical instrument on a first surface;
• a plurality of light sensors disposed at the working end of the surgical instrument on a second surface opposing the first surface, the first and second surfaces disposed on a pair of non-parallel jaws;
• and
• a controller coupled to the plurality of light sensors, the controller configured to:
• determine an illumination pattern from a non-pulsatile component of the signals received from the plurality of light sensors,
• determine a first point at a first side of a region of interest within the illumination pattern and a second point at a second side of the region of interest,
• determine a linear curve for the region of interest within the illumination pattern including the first and second points disposed about the region of interest, and
• utilize the linear curve to remove the angular distortion from the region of interest between the first and second points.