CT and MRI are two completely different examination methods: 1, the imaging principle of the two is different, CT uses X-rays for imaging, while MRI uses the nucleus of hydrogen atoms in the body under the action of an applied magnetic field for imaging, so the former has radiation, while the latter does not. 2, the scope of application is different, the use of CT is more extensive, except for pregnant women and people who can not cooperate with basically all It can be done, but it is more suitable for patients with respiratory system, digestive system and trauma. The scope of application of MRI is relatively small, and it is not suitable for patients with metal foreign bodies or those who cannot cooperate with the examination, but it is more suitable for the nervous system, soft tissue and gynecological diseases. 3, the price is different, CT is cheaper, between 100-300 yuan for one part. While the price of MRI is relatively high, between 400-600 yuan for one part.