What should you know about an MRI machine for the back?

You lie on a motorised table that moves into the scanner. The machine uses a magnetic field and radio waves to form image slices of the requested spinal region. Depending on the question, the images can show discs, vertebrae, the spinal canal, nerve roots, ligaments, muscles and signs of fluid or inflammation. The scan may help clinicians investigate persistent back pain, leg symptoms, weakness, a suspected disc problem or a previous injury. An image finding is not automatically the cause of pain, so the report is matched with your history and neurological examination.

Tell the imaging team about metal fragments, implants, medication pumps, hearing devices, kidney disease, allergies and possible pregnancy. Remove jewellery, cards and other metal items as instructed. Loud knocking sounds are expected, and ear protection is provided. Staying still helps the images remain clear; you can communicate with the team during the examination. If enclosed spaces worry you, mention this before the appointment. A [3T MRI Scanner](/technology/3t-mri-scanner/) is designed to provide strong, detailed MRI imaging, but the appropriate scanner and sequence depend on your clinical question.

Back pain with new loss of bladder or bowel control, numbness around the groin, or worsening weakness in both legs needs emergency assessment. Seek urgent help for back pain with fever and feeling very unwell, or after a serious injury. Do not wait for a routine scan appointment when these warning signs appear.

Ask which spinal area should be scanned, what symptom the examination is investigating, whether contrast is needed, and how the findings could affect physiotherapy, medicines or further care. Ask what warning symptoms require immediate help.