The difference between enhanced CT and low-dose spiral CT mainly lies in different examination methods and different indications. 1. Different examination methods: Enhanced CT requires intravenous injection of iodine-containing contrast agent, followed by CT examination, which is more conducive to the diagnosis of diseases. On the other hand, low-dose spiral CT is only a scanning examination method, which does not require injection of contrast agent. 2. Different indications: Enhanced CT examination has a wide range of indications, including diagnosis of various tumor diseases, cardiac blood vessel examination, such as lung cancer, coronary heart disease, aortic aneurysm, lower limb blood vessels, etc. Low-dose spiral CT examination is only a scanning examination method, which does not need injection of contrast medium. On the other hand, low-dose spiral CT examination is mainly suitable for lung examination, and other parts of the body are generally not suitable. Patients need to choose the appropriate examination program according to their own condition and the doctor’s guidance and advice.