DR radiation disappears after the patient’s examination, because the radiation effect of DR radiation on the human body is instantaneous, generated instantly when the instrument is started, and the radiation stops when the instrument is terminated, so the patient does not need to worry too much after the examination. Moreover, the radiation of DR is relatively the lowest dose among the imaging methods using radiation, the radiation to human body is usually below 1mSv, which is similar to the radiation of many natural backgrounds, and does not have much effect on human body. In many fertility departments, some patients can even plan a pregnancy the following month after having a DR chest X-ray, so it is relatively safe.