Medical Applications Of X-rays

（1） X-ray diagnosis [9]
The application of X-rays in medical diagnosis is mainly based on the penetration, differential absorption, photosensitivity, and fluorescence effects of X-rays. As X-rays pass through the human body, they are absorbed to varying degrees. If the amount of X-rays absorbed by bones is more than that absorbed by muscles, the amount of X-rays after passing through the human body will be different. In this way, the density distribution information of each part of the human body will be carried, and the intensity of fluorescence or photosensitivity caused on the fluorescent screen or photographic film will be greatly different, Therefore, shadows of different densities will be displayed on fluorescent screens or photographic films (after development and fixation). Based on the comparison of shadow intensity, combined with clinical manifestations, laboratory results, and pathological diagnosis, it is possible to determine whether a certain part of the human body is normal. As a result, X-ray diagnostic technology became the earliest non invasive visceral examination technique applied in the world.
（2） X-ray therapy
The application of X-rays in treatment is mainly based on their biological effects. When X-rays of different energies are applied to irradiate the cellular tissues of human lesions, the irradiated cellular tissues can be damaged or suppressed, thereby achieving the therapeutic purpose of certain diseases, especially tumors.
（3） X-ray protection
While utilizing X-rays, people have discovered problems that can cause hair loss, skin burns, visual impairment of workers, leukemia, and other radiation injuries to patients. To prevent harm to the human body caused by X-rays, corresponding protective measures must be taken. The above constitute the three major links of X-ray application in medicine - diagnosis, treatment, and protection.