X-ray imaging system and method

An X-ray imaging system, comprising an X-ray source, a high-voltage generator, a collimator, a digital flat-panel detector, and a host computer, wherein the host computer is configured to implement a signal transmission and processing among the X-ray source, the high-voltage generator, the collimator and the digital flat-panel detector, wherein the collimator comprises a collimating sheet assembly that makes light form a projection area on a subject;

• the digital flat-panel detector is configured to have a DAEC function and be able to generate a DAEC parameter which comprises an actual DAEC response area and a target gray value,
• wherein the system further comprises a PLC and a camera for capturing an image of the subject,
• the PLC is configured to display the image captured by the camera on a display screen, and generate a coordinate system and a projection image frame corresponding to the projection area on the display screen, wherein a pixel of a captured image and a coordinate point of the coordinate system form a one-to-one correspondence, and the PLC is configured to automatically determine the projection area and the actual DAEC response area to a desired position according to the captured image and a demand of a diagnostic part and/or position,
• the projection area is configured to be adjusted according to the demand of the diagnostic part and/or position or an adjustment of the projection image frame, and the projection area is adjusted by the collimating sheet assembly;
• the actual DAEC response area is configured to be adjusted according to the demand of the diagnostic part and/or position, and the actual DAEC response area is adjusted by the digital flat-panel detector;
• the projection area is configured to cover the actual DAEC response area, the display screen is connected to the PLC;
• the PLC is arranged in the collimator;
• the projection image frame and a frame of the response area would or would not be displayed on the display screen.