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In gastrointestinal surgery, surgeon subjectively judges if the organ is healthy from the color. However it is difficult to discriminate a small difference of organ’s color by visual inspection. In this paper, we focus on the tissue oxygen saturation (StO2) that represents balance of oxygen demand and supply in tissue and try to estimate its value by transmitted light intensity analysis. We developed a system for measurement of transmitted light intensity using a compact spectrometer and a halogen light source and collected transmitted light intensity data from pig’s small intestines. Absorbance of the tissue was then calculated from those data. On the basis of Beer-Lambert law, we estimated StO2 from the calculated absorbance. Results of evaluation experiment to pig’s small intestines suggested the possibility of quantitative evaluation of tissue viability by the proposed method.

Fundamental Study on Intraoperative Quantification of Gastrointestinal Viability by Transmission Light Intensity Analysis