Is chest X-ray harmful to human body?

Chest X-ray fluoroscopy is a common X-ray examination method. It uses the characteristics of X-ray's penetrability, fluorescence and photographic effect to make the human body form an image on the screen. Due to the difference in density and thickness of human tissues, when X-rays penetrate different tissues, the absorption degree of X-rays is different, so the amount of X-rays reaching the screen is also different, forming a black-and-white contrast image, which provides a basis for doctors' diagnosis.

X-rays penetrating the human body will have certain biological effects. If the amount of X-rays exposed is too much, which exceeds the allowable radiation amount, it may cause radiation reaction and even a certain degree of radiation damage. However, if the X-ray radiation is within the allowable range, the impact is generally small. In recent ten years, due to the improvement of X-ray equipment, the use of high kilovolt technology, image enhancement technology, high-speed intensifying screen and fast X-ray photographic film, X-ray radiation has been obviously reduced, and the possibility of radiation damage is getting smaller and smaller.

Chest X-ray examination has the largest radiation, and one chest X-ray examination is equivalent to taking 10 X-rays. However, chest X-ray examination usually takes tens of seconds, so the harm to human body is very limited. An adult's chest X-ray has almost no obvious harm.

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