What is the chest X-ray of college entrance examination?

Chest radiography, called 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.

Extended data:

First, related applications

Chest X-ray is mainly used to examine and diagnose lung diseases, the size of the heart, ribs, pleura, chest wall, mediastinum and bronchus. In order to reduce the X-ray injury, patients should not do too many chest X-rays and repeat them in a short time, especially when doing chest X-rays, and should not blindly ask doctors to look at them longer and more carefully.

Second, matters needing attention

With the continuous improvement of X-ray instruments, the radiation dose is getting smaller and smaller, and the chest X-ray examination usually takes less than ten seconds, which has little harm to human body and can be basically ignored.

However, because children are at the peak of growth and development, cell division is active, which is much more sensitive than adults, and the younger they are, the more sensitive they are (embryonic tissues are more sensitive to radiation), which will cause some somatic cells to be damaged. If these damaged cells can't repair themselves (or are abnormal), they will stay in the body, just like a "time bomb".

In the case of low immunity or the existence of cancer-promoting factors, it began to replicate crazily and became a cancer focus. Therefore, the more radiological examinations, the greater the probability of inducing cancer. In the decades after radiological examination, it may induce a far-reaching effect.

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