MRI Scanner Types: What You Should Know

MRI scanner types differ mainly in their shape, strength, and the body area they are designed to examine. A standard closed MRI has a tube-shaped magnet and can produce detailed images of many parts of the body. An open MRI has a more spacious design and may feel more comfortable for someone who is anxious in enclosed spaces, although its images may not suit every examination. Some scanners are built for a particular region, such as an arm, leg, breast or head. The radiology team selects the equipment and settings that fit the clinical question, your body area and your safety needs.

Closed scanners surround the body with a strong magnetic field and are commonly used when detailed images are needed. Wide-bore models have a wider opening than traditional equipment, which can make positioning easier while retaining a tunnel-like shape. Open scanners leave more space around the sides of the body and can help with claustrophobia, but availability and image quality vary by machine. Extremity scanners focus on a smaller area, such as a joint, and are not suitable for imaging the whole body.

Scanner strength is one factor affecting image detail and examination time; it does not by itself determine which machine is right for you. Some MRI examinations use a contrast medicine injected into a vein to make selected tissues easier to distinguish. Contrast is not needed for every scan, and the team checks relevant medical information before recommending it.

Before entering the MRI room, tell the imaging team about implanted devices, metal fragments, previous surgery, kidney problems, allergies, pregnancy or possible pregnancy, and severe anxiety in enclosed spaces. Remove metal objects and follow the instructions about food, drink and medicines. During the scan, you will usually lie still while the machine makes loud tapping or knocking sounds; hearing protection is provided. You can communicate with the team, and the examination may be stopped if you become distressed. Read more about an MRI Scan and the MRI Scanner.

Contact the imaging service promptly if you remember an implant, metal fragment or other safety detail after booking the examination. After contrast, seek urgent medical help for trouble breathing, swelling of the face or throat, fainting or rapidly spreading hives. Tell the team about any new discomfort, rash or unusual symptom after the scan. An MRI is an investigation, not a diagnosis by itself; results are interpreted alongside your history, examination and other tests. Depending on the reason for imaging, your clinician may discuss a biopsy or another diagnostic step.

Ask which body area the MRI will examine, whether contrast is recommended, and whether a closed, wide-bore, open or extremity scanner is appropriate. You can also ask how to manage claustrophobia, whether your implanted device has been cleared for MRI, when to expect the report, and what the next step will be if the images show an area that needs further assessment.