Chest CT examination and X-ray examination are essentially the same, both are black and white images produced by X-rays through the body, both produce a certain amount of ionizing radiation, the specific differences are as follows: 1. Ionizing radiation: Chest CT has a greater amount of radiation. 2. Resolution: X-rays have a higher spatial resolution, but the ability to distinguish the original tissue is relatively poor, while CT examination has a higher resolution of the original tissue, and the spatial resolution is not as good as X-ray examination. 3. Not as good as X-ray examination. 3, lesion examination: for the chest, both CT and X-ray examination are commonly used clinically. X-ray examination is often used for initial screening of lung lesions, which can only show larger lesions, while for tiny lesions, such as small lung nodules, CT is more advantageous, and CT is more helpful for its characterization.