Doing X-ray or CT examination is conducive to confirm the diagnosis of the disease ah, such as bone fracture, bone fracture, liver cancer, cerebral hemorrhage, cerebral hemangioma, bulging discs, spondylitis and so on, these diseases can not be delayed, to do radiography is conducive to the rapid diagnosis of the disease.
Radiation dose unit is "siever", do a chest X-ray on the patient radiation dose of about 20 microsieverts, do a dental or hand X-ray on the patient radiation dose of about 5 microsieverts, do an arm or calf X-ray on the patient radiation dose of about 1 microsieverts, do a chest CT on the patient radiation dose of about 5800 microsieverts. about 5,800 microsieverts.
What is the concept of these radiation doses? Human beings are exposed to natural radiation dose of about 10 microsieverts per day, the Chinese empire stipulates that the annual radiation dose received by the citizens of the radiation dose super background radiation value shall not be higher than 5000 microsieverts, the United States empire Environmental Protection Agency, the citizens of the annual radiation dose ceiling shall not be higher than 10000 microsieverts, the United States empire Environmental Protection Agency, engaged in the radiation staff to receive radiation doses of up to 50,000 microsieverts per year. The lowest dose known to have an effect on cancer rates is 100,000 microsieverts.
In summary, the radiation dose of ordinary X-ray examination is still very low, CT examination radiation dose is higher, but also have to do dozens of times in a row to be harmful to people.