What should you know about coil MRI scans?

The coil does not produce the main magnetic field. It detects signals from the tissues while the scanner turns those signals into images. Its shape depends on the area being examined, such as the head, breast, spine, knee or pelvis.

A coil may look like a frame, pad or fitted support. Some coils surround the body part, while others rest above or below it. The radiographer positions it close to the area of interest because proximity helps capture a clearer signal. It should remain still during image collection.

You may feel enclosed by a head or body coil, but the equipment should not press painfully. MRI uses a strong magnetic field and radiofrequency energy rather than ionising radiation. Contrast dye may be recommended for some examinations, but the coil itself does not inject contrast.

Complete the MRI safety questions carefully. Tell the team about implanted devices, metal fragments, previous operations, pregnancy or possible pregnancy, kidney problems, allergies and any earlier reaction to contrast. Remove metal objects as directed, including jewellery, hearing aids and removable dental items.

During the scan, lie in the position arranged by the radiographer and use the supports provided. You will hear loud tapping or knocking, so hearing protection is supplied. Staying still helps prevent blurred images. If enclosed spaces worry you, mention this before the appointment so the team can discuss positioning, communication and available comfort measures.

Use the call device immediately if you develop breathing difficulty, facial or throat swelling, widespread itching, severe dizziness, sudden pain, burning or marked discomfort during the scan or after contrast is given. The radiographer can stop the examination and assess you.

Before entering the MRI room, report any device or metal exposure that was missed on the questionnaire. After leaving, seek urgent medical help for breathing difficulty, collapse, or rapidly increasing swelling. For milder symptoms after contrast, contact the imaging department or your treating team and describe what started and when.

Ask which body area will be covered by the coil, whether contrast is planned, and whether an implant needs device-specific checks. You can also ask how long you must remain still, whether a companion may attend, and what options are available if pain or claustrophobia makes positioning difficult.