What to know about a big MRI scanner

The phrase is informal and may refer to a wide-bore scanner, a larger patient table, or an open-style MRI. These machines are not identical, so the imaging centre should confirm which type it has and whether that system is suitable for the body area your clinician needs to examine.

A wide-bore MRI has a broader tunnel than some conventional machines, which can give the shoulders and body more room. An open-style system has a different physical design and may feel less enclosed. Table width, table capacity, tunnel diameter, image requirements, and positioning space can all affect whether a particular scanner is appropriate.

A larger opening can help people who have a larger body size, broad shoulders, limited mobility, pain when lying in certain positions, or anxiety in enclosed spaces. It does not remove the need to lie still, and the scanner will still make loud tapping or knocking sounds. The exact examination may also require a coil to be placed around or near the body part being imaged.

Call the imaging centre before the appointment if fit, pain, mobility, or claustrophobia may be an issue. Give your height and weight if requested, describe any position you cannot hold, and ask whether you can see or speak with the technologist throughout the scan. If anxiety is significant, discuss the available comfort or medication options in advance because some arrangements require planning.

Complete the MRI safety screening carefully. Report every implant, medical device, operation involving metal, metal fragment injury, medicine patch, or wearable device. Bring any implant identification card you have. Also tell the team if you are pregnant or may be pregnant, have kidney problems, have reacted to MRI contrast before, or need help transferring onto the table. The team can then check the device details, contrast plan, and positioning requirements before you enter the scanner room.

During the scan, use the call device immediately if you feel burning, unusual warmth, sharp pain, pressure that is becoming intolerable, breathing difficulty, dizziness, or sudden panic. Do not try to endure a new symptom to finish the examination; the technologist can stop the scan and check you.

If contrast was given, tell staff promptly about pain or swelling around the injection site, hives, throat tightness, facial swelling, wheezing, or trouble breathing. Seek emergency care for severe breathing difficulty, collapse, or rapidly worsening swelling after leaving the facility. Contact the imaging centre for new or persistent symptoms that concern you after the examination.

Ask which scanner design will be used, whether it can accommodate your body and the required position, and whether the planned machine provides the images needed for your clinical question. You can also ask how long you must remain still, whether contrast is planned, what the coil and positioning will feel like, and what support is available for pain or claustrophobia. If you have an implant, ask whether the team has confirmed its exact model and MRI conditions.