X-rays
are used in medical diagnosis, mainly based on X-ray penetration, differential absorption, photosensitivity and fluorescence. Since X-rays are absorbed in different degrees when passing through the human body, for example, the amount of X-rays absorbed by bones is more than that of muscles, so the amount of X-rays after passing through the human body is different, so that the density distribution of various parts of the human body is portable Information, the intensity of the fluorescence or sensitization caused on the fluorescent screen or on the photographic film is quite different, so the fluorescent screen or on the photographic film (after developing and fixing) will show shadows of different densities. According to the contrast of shades, combined with clinical manifestations, laboratory results and pathological diagnosis, it can be judged whether a certain part of the human body is normal. As a result, X-ray diagnostic technology has become the world’s first non-traumatic visceral inspection technology.
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