CT versus (MRI). For example, MRI is clearer than CT in the examination of the nervous system and soft tissues, but CT is better than MRI in the examination of bone structures; CT is less expensive than MRI in the same range of examination, which is equivalent to 1/2. Again, the choice of the section of the MRI scan can be arbitrary, for example, if you cut a radish, you can cut it any way you want; but CT can only do cross-sectional imaging, that is, you can only cut the radish from one end to the other. However, CT can only do cross-sectional imaging, which means that you can only cut the radish from one end to the other; nowadays, multi-row spiral CT can be used for three-dimensional reconstruction under computer software after scanning because the layer spacing of the cut surface can be very small, which is much more intuitive than filming in diagnosing skeletal diseases (such as rib fractures). Advantages: 1. MRI does not damage the body; 2. MRI can obtain stereoscopic images of the brain and spinal cord, unlike CT, which scans layer by layer and may miss lesions; 3. It can diagnose cardiac lesions, which CT is difficult to do because of its slow scanning speed; 4. It is better than CT for examining the bladder, rectum, uterus, vagina, bones, joints, and muscles. Disadvantages: 1. Like CT, MRI is also Unlike endoscopy, it is difficult to confirm the diagnosis of many lesions based on MRI alone, unlike endoscopy, which can obtain both imaging and pathological diagnosis; 2, the examination of the lungs is not superior to X-ray or CT, and the examination of the liver, pancreas, adrenal glands and prostate is not superior to CT, but the cost is much higher; 3, the lesions of the gastrointestinal tract are not as good as endoscopy; 4, those who have metal objects in their bodies should not receive MRI 5. Critically ill patients cannot do it; 6. Within 3 months of pregnancy; 7. With pacemakers.