Rapid Parathyroid Recognition System Based on Near-Infrared Autofluorescence

Based on near-infrared autofluorescence, a rapid identification system for parathyroid glands during surgery is designed, the system is of great value for rapid identification of parathyroid glands during operation. In this research, a ringshaped adjustable excitation light source and a high-precision adjustable LED constant current source are designed. The nearinfrared light source is used to excite tissue fluorescence, and the tissue autofluorescence information is collected by a highsensitivity CMOS camera. The obtained fluorescence images are processed, accurately identifying parathyroid glands. Simulating tissue fluorescence through gradient concentration of indocyanine green (ICG) solution, the experimentally measured fluorescence intensity is positively correlated with the concentration of ICG, and both the signal-to-noise ratio and signal-tobackground ratio meet the requirements for intraoperative discrimination, which verifie the sensitivity and accuracy of the proposed system for different fluorescence intensities. Using this system to test tissue phantoms, the fluorescent phantom can be clearly distinguished from the background. The parathyroid gland and surrounding tissues were tested, and the parathyroid gland is green and clearly distinguished from the surrounding tissues, which preliminarily verifies that the proposed system can be used for the identification and detection of parathyroid glands.