In modern medicine, the methods to obtain the image of blood circulation system are X-ray scanning, ultrasonic scanning and infrared imaging. X radiography requires the use of contrast agents, while ultrasonic scanning requires the use of gels on the skin, which complicates the process. The main advantages of infrared imaging are noninvasive and safe, and there is no need to put any contrast agent or foreign body (needle, etc.) into the human body.

This system uses the method of recording backscattered laser radiation. The optical fibers are evenly distributed around the imaging area, and the laser power on each fiber is 2-3 MW. Radiation occurs in contact with skin, which can increase the detection depth and maintain the uniformity of radiation distribution in the imaging area. Laser radiation is transmitted to human tissues through optical fibers that directly contact the skin, and are scattered or absorbed within the tissues. Blood vessels absorb radiation better than surrounding tissues.

The infrared camera records the backscattered laser radiation, and the angiography image will be displayed on the monitor screen. In this way, the actual boundary of the vessel can be evaluated and determined according to the distribution of the backscattered radiation intensity of the selected contour.

In order to obtain high contrast images and increase imaging depth, the power of the laser source may be increased, which will increase the heat transferred from the laser to human tissues, which may cause damage to the tissues of patients. Therefore, it is very important to determine the best radiation wavelength range to ensure the lowest radiation intensity and the maximum imaging depth. According to Russian researchers, the best wavelength range they obtained in their experiments was 760-800 nm.

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