In fact, the lumbar spine CT and MRI can not replace each other, and can not judge which is better, because the angle of examination of the two is different, such as CT examination mainly to bone tissue, and MRI mainly to soft tissue, nerve better, so the two have their own advantages, as follows: 1, MRI: generally think that the lumbar spine to do MRI is better, because MRI to see more comprehensive, soft tissue shows more clearly The MRI can also see whether the nerves are compressed, and the MRI does not have the danger of radiation, so the application is broader; 2, lumbar spine CT: CT mainly observes the bone better, because there is radiation, so it can not be done many times. It is recommended that it is better to do MRI first, but MRI requires waiting in line, which may take longer. If the condition is more urgent, you can do CT first for a rough observation and then do MRI when needed, but if you can wait, it is better to do MRI.