MRI Scanner

An MRI scanner is a large machine with a tunnel-shaped opening and a movable table. It uses a strong magnetic field and radio waves to produce images of soft tissues and body structures. The scanner does not use X-rays. Coils placed around the body part help receive the signal. The images are reviewed by trained specialists and interpreted alongside your symptoms, examination and other tests.

MRI can help show the size and position of a mass, its relationship to nearby tissues, and changes over time. Depending on the question, an imaging team may use contrast through a vein to make certain areas easier to distinguish. You may be asked to lie still, follow breathing instructions or hold your breath briefly. The scanner makes loud knocking sounds, so hearing protection is provided and communication is available.

MRI images are detailed but do not identify every disease on their own. Movement can blur images, and some devices, metal fragments or medical conditions may make MRI unsuitable or require special planning. The scanner can feel enclosed, and the examination may take time. Depending on the body area and clinical question, alternatives may include an MRI scan with a different protocol, CT, ultrasound, mammography or another test chosen by the care team.

An MRI report describes visible findings; it is one part of deciding what happens next. A finding may need comparison with earlier images, another scan, a biopsy or clinical follow-up. Ask which question the scan is intended to answer and when the report will be reviewed with you. If contrast is planned, ask why it is needed and tell staff about kidney problems, allergies or a previous reaction.

Tell the imaging team about pacemakers, implants, clips, shrapnel, metalwork, hearing devices, pregnancy or possible pregnancy. Do not bring loose metal objects into the scanning room. Some examinations use contrast, which requires additional screening. If you are anxious in enclosed spaces, mention this before the appointment so the team can discuss practical support.