What should you know about an MRI scanner?

The scanner's magnetic field affects hydrogen signals in the body, and radio waves are used to produce images from those signals. You usually lie on a movable table that slides into a short tunnel. Coils placed near the body part help capture clearer images.

The machine makes loud knocking or buzzing sounds and the examination can feel enclosed. Ear protection, communication with the technologist, and sometimes music can make the experience easier. Contrast may be used when it adds useful detail.

Tell the imaging team about every implant, pacemaker, metal fragment, surgical clip, hearing device, medication pump, or other medical device. Mention pregnancy, kidney disease, prior contrast reactions, and claustrophobia. Remove jewellery, phones, cards, and metal clothing items. Follow the centre's instructions about food, drink, and medicines.

Tell the technologist immediately if you feel burning, pain, dizziness, panic, or unusual discomfort during the scan. After contrast, seek urgent help for breathing difficulty, facial swelling, faintness, or a widespread rash. The scanner itself does not explain a symptom; urgent symptoms still need clinical assessment.

Ask what body area will be scanned, whether contrast is planned, which implants are compatible, how long you may need to remain still, and when the report will be discussed. If enclosed spaces worry you, ask about practical support before the appointment.