Imaging method and imaging system

An imaging system, comprising:

• a laser device, a probe, a transmitting circuit, a receiving circuit, and a processor, wherein
• the laser device is configured to generate, within a first period, a first laser for irradiating a target body, wherein the first laser is coupled to the probe through an optical fiber bundle and emitted to the target body through the optical fiber bundle;
• the receiving circuit is configured to control the probe to receive a first photoacoustic signal returned from the target body;
• the processor is configured to determine a first photoacoustic image of the target body according to the first photoacoustic signal;
• the laser device is further configured to generate, within a second period, a second laser for irradiating the target body, wherein the second laser is coupled to the probe through the optical fiber bundle and emitted to the target body through the optical fiber bundle, and the second period does not overlap with the first period;
• the receiving circuit is further configured to control the probe to receive a second photoacoustic signal returned from the target body;
• the processor is further configured to determine a second photoacoustic image of the target body according to the second photoacoustic signal;
• the processor is further configured to determine blood oxygen saturation values of all pixel points corresponding to the target body according to the first photoacoustic image and the second photoacoustic image;
• and generate a blood oxygen image of the target body according to the blood oxygen saturation values of all pixel points corresponding to the target body;
• and
• the processor is further configured to:
• determine positions of each pixel point of a target tissue in the blood oxygen image to determine an area corresponding to the target tissue in the blood oxygen image;
• and extend a preset range centered on the area corresponding to the target tissue to a peripheral and then remove the area corresponding to the target tissue, so as to obtain a peripheral area of the target tissue in the blood oxygen image;
• determine a first blood oxygen saturation value of the area corresponding to the target tissue and a second blood oxygen saturation value of the peripheral area of the target tissue;
• and
• determine a blood oxygen ratio of the first blood oxygen saturation value to the second blood oxygen saturation value;
• and
• the processor is further configured to:
• determine a number of pixel points of blood vessels and a number of all pixel points corresponding to the target body, wherein each pixel point of the blood vessels has a blood oxygen saturation value greater than a threshold value;
• and
• determine a blood vessel density according to the number of pixel points of the blood vessels and the number of all pixel points corresponding to the target body;
• and
• analyze the target tissue according to the blood vessel density and the blood oxygen ratio to obtain an analysis result of the target tissue.