The differences between general X-ray plain film and CT examination are as follows: first, X-ray examination belongs to two-dimensional imaging, while CT examination belongs to three-dimensional imaging, and the two present different image effects in terms of spatial structure; second, the radiation dose of X-ray examination is often much less than that of CT examination; third, the price, the price of X-ray examination is often only 1/5 or 1/10 of that of CT examination, but this is determined according to the examination site and examination items; fourth, CT examination can reduce coverage and avoid errors caused by overlapping images, while X-ray examination cannot be avoided.