What to know about different MRI scanners

Conventional closed-bore systems place the examined area inside a cylindrical magnet. Wide-bore models offer more space, while open designs leave more room at the sides and may help some people who feel confined. Dedicated scanners image a particular limb or body region. Not every design can perform every specialised examination.

Stronger or more specialised systems can support detailed images and advanced sequences, but magnetic strength alone does not determine whether a scan will answer the clinical question. The receiver coil, scan protocol, software, body area, movement, and radiology expertise also influence the result. An open scanner may improve access or comfort, yet it may not provide the sequences or image detail needed for a small lesion or complex treatment plan. The radiology team matches the equipment and protocol to the requested examination.

Give the imaging service details of any pacemaker, implanted pump, hearing implant, surgical clip, metal fragment, or other device before the appointment. Staff need the device name and model when possible because MRI conditions differ between implants and scanners. Mention pregnancy or possible pregnancy, kidney problems, prior contrast reactions, pain when lying still, and anxiety in enclosed spaces. Follow instructions about eating, medicines, clothing, and metal removal. If comfort is a concern, ask whether a wide-bore scanner, positioning support, or prescribed calming medicine would still allow the required images.

During the scan, use the call device if you feel intense pain, burning, breathlessness, faintness, or severe distress; the radiographer can stop the examination and assess you. After contrast, trouble breathing, facial or throat swelling, collapse, or a rapidly spreading rash requires urgent medical help. New neurological symptoms such as a seizure, sudden weakness, new speech difficulty, or loss of consciousness also need emergency assessment rather than waiting for an MRI booking or report.

Ask which body area and clinical concern the MRI will assess, whether contrast or a specialised sequence is expected, and whether your implant documentation has been reviewed. If you need an open or wide-bore unit, confirm that the proposed scanner can perform the requested protocol. You may also ask how long you must remain still, whether a companion can attend, when the report should be available, and who will discuss its meaning with you.