MRI Scan Machine: What to Know

The magnetic field affects hydrogen signals in the body, and the scanner converts those signals into cross-sectional images. Different settings highlight different tissues, such as muscle, bone marrow, organs, or blood vessels. The machine does not use ionising radiation. Some examinations include contrast delivered through a vein to make selected tissues easier to distinguish. A radiologist reviews the images and prepares a report.

Safety screening is essential because the magnet can affect some implants, devices, and metal objects. Tell staff about pacemakers, clips, pumps, metal fragments, hearing devices, kidney disease, allergies, and pregnancy. Remove jewellery, cards, phones, and loose metal. During scanning, knocking or buzzing sounds are normal. You can communicate with staff and usually receive an alarm button; keeping still helps produce usable images.

Tell staff immediately if you feel unwell during the scan, especially with breathing trouble, swelling, a widespread rash, severe dizziness, or pain after contrast. Outside the appointment, seek urgent help for new weakness, confusion, or loss of bladder or bowel control rather than waiting for an MRI booking.

Ask whether your device is MRI-compatible, whether contrast is needed, how long you may need to remain still, and what support is available if noise or the enclosed space causes distress.