First of all, magnetic vibration is a method to produce images by using magnetic fields. Magnetic vibration has no radiation and is harmless to human body. The thoracic vertebra, lumbar vertebra and coccygeal vertebra you examined are usually done separately, but if the magnetic vibration is better, such as 1.5T or more, you can do it together. The reasons why your hospital doesn't do it together may be: 1, the magnetic vibration equipment is old, not in recent years; 2. There are few coils, so it should be segmented; 3, the hospital system, must be segmented charges. I can't guess the other reasons.