The three cannot replace each other, but complement each other. mri and ct cannot replace plain x-ray, and mri cannot replace ct. those who think that mri is better than ct, clearer than ct, clearer than x-ray, or ct is clearer than x-ray are wrong. x-ray can understand the overall architecture of bone structure and bone changes, with or without fracture dislocation, lumbar spine power position film can assess lumbar spine CT is superior to X-rays in examining cross-sections of the lumbar spine, especially for dense tissues, and is highly accurate in measuring distances between bony structures. If you want to understand the problems of intervertebral disc or intervertebral space, you need to scan parallel to the intervertebral space, and if you want to understand the vertebral bone condition, you should perform an aliquot scan parallel to the vertebral body. cTA (CT angiography) can clearly show the direction of blood vessels and vascular lesions, and the sensitivity of the examination of tumors is significantly higher than that of ordinary X-ray films.
The most important difference between MRI and X-ray and CT examinations is that there is no X-ray radiation during the examination and the damage to the body is minimal. MRI is mainly used to detect soft tissue diseases, and MRI can not only perform cross-sectional scans, but also sagittal scans and angiographic imaging (MRA), which is better than CT and X-ray for soft tissue, but less accurate than CT for bone tissue. Fractures can be examined using deglossal phase MRI; MRI is preferred in the diagnosis of intervertebral disc lesions, especially lumbar disc herniation, lumbar spinal stenosis, intravertebral canal tumors and spinal deformities and spinal tumors, as well as infectious spinal diseases.