The difference between MRI and CT is the difference in the principle of examination, which is mainly manifested as follows: 1. CT examination: it is more suitable for the examination of brain hemorrhage and traumatic brain injury, with fast and accurate diagnosis, and the disadvantage is lower soft tissue resolution and radiation; 2. MRI examination: it is a green and safe examination with higher soft tissue resolution, which is more suitable for other brain diseases other than traumatic brain injury and brain hemorrhage, and the disadvantage is high cost and long examination time, and patients with pacemakers and ferromagnetic implants in the body need to avoid MRI examination.