The application of X-ray machine in medical diagnosis is mainly based on the penetration, differential absorption, photosensitivity and fluorescence of X-ray machine. Since the X-ray machine is absorbed to different degrees when it passes through the human body, for example, the amount of X-ray machine absorbed by the bone is more than that absorbed by the muscle, the amount of X-ray machine after passing through the human body is different, so the portable carries the information of the density distribution of various parts of the human body, and the intensity of fluorescence or photosensitivity caused on the fluorescent screen or photographic film is greatly different, Therefore, shadows of different densities will be displayed on the fluorescent screen or photographic film (after development and fixation). According to the contrast of shade, combined with clinical manifestations, laboratory results and pathological diagnosis, we can determine whether a part of the human body is normal. As a result, X-ray machine diagnosis technology has become the earliest non-gouging visceral examination technology in the world.

（2） X-ray machine treatment

The X-ray machine is used for treatment, mainly based on its biological effect. When the X-ray machine with different energy is used to irradiate the cell tissue of the human focus part, the irradiated cell tissue can be damaged or suppressed, thus achieving the treatment purpose of some diseases, especially.

（3） X-ray machine protection

At the same time of using the X-ray machine, people have found problems that lead to hair loss of patients, skin burns, visual impairment of staff, leukemia and other radiation injuries. In order to prevent the injury of the X-ray machine to human body, corresponding protective measures must be taken. The above constitute the three major links of X-ray machine application in medicine - diagnosis, treatment and protection.

Security application

X-ray machines are widely used in safety inspection of railway stations and airports.

The X-ray machine safety inspection equipment is completed by sending the checked baggage into the crawler channel with the aid of the conveyor belt. After the baggage enters the channel, the light barrier signal will be blocked, and the detection signal will be sent to the control unit to trigger the ray source to emit the X-ray beam. A very narrow fan-shaped X-ray beam passing through the collimator penetrates the baggage on the conveyor belt and falls onto the dual-energy detector. The high-efficiency semiconductor detector converts the received X-ray machine into electrical signals. These very weak current signals are directly quantized and transmitted to the industrial control computer through the universal serial bus for further processing. After complex calculation and imaging processing, high-quality images are obtained.