MRI uses powerful magnets and radio waves to create detailed images of the body’s internal structures. Preparing for a brain scan requires careful consideration of what is worn, as certain materials can interfere with the scanner or pose a safety risk.
Acceptable Attire: Focus on Comfort and Safety
The best clothing choice for an MRI is loose-fitting attire made entirely from non-metallic fibers. Natural materials such as cotton and linen are highly recommended because they contain no magnetic or conductive properties that could interact with the scanner. Blended fabrics are permissible if they lack metallic threads or silver-based antimicrobial technology, which is sometimes found in athletic wear.
Since the patient must lie still for the duration of the scan, comfort is paramount. Simple t-shirts and sweatpants without any metal components are ideal. For women, a sports bra is acceptable only if it is entirely free of metal underwire, hooks, or metallic adjusters.
Mandatory Removal: External Metal and Electronics
The strong magnetic field of the MRI machine necessitates the complete removal of all easily detachable metallic items and electronics before entering the scanning room. Common personal accessories like watches, jewelry, hairpins, and keys must be left outside the controlled area. These items pose a direct safety hazard because the magnetic field can turn them into dangerous projectiles or cause them to heat up.
Even small amounts of metal can cause distortion artifacts in the resulting brain images, obscuring diagnostic details. Items such as coins, cell phones, and certain types of removable dental work also contain ferrous metals and must be secured away from the scanner. Patients must remove hearing aids, as their electronic and magnetic components will be damaged by the powerful field.
Hidden Hazards: Clothing Components and Medical Devices
Less obvious sources of metal can be found in clothing components. Many garments contain hidden metallic elements, such as snaps, grommets, or rivets, which must be avoided. Some modern performance wear, including athletic and compression clothing, incorporates metallic microfibers, often silver, for anti-odor or anti-static purposes. These can cause localized skin burns due to heating during the scan.
Certain medical items attached to the skin also present a risk. Transdermal medication patches may contain a thin layer of metal, such as aluminum foil, in their backing. If these patches contain metal, the magnetic field can cause them to overheat, leading to skin burns or increased drug absorption. Tattoos and permanent makeup can contain trace amounts of metallic iron oxide pigments, which may cause a burning sensation, swelling, or image distortion.
All patients should inform the technician about any fixed internal metal, such as surgical implants or pacemakers. These require specific safety clearances before the scan can proceed.
The Gown Option: When Changing is Required
If a patient arrives wearing clothing that contains metal, or if the technician has concerns about hidden metallic threads or components, a change of clothes will be necessary. Imaging facilities routinely provide a clean, facility-approved hospital gown for this purpose. Changing into this metal-free garment is the simplest way to eliminate all risks associated with personal attire.
Opting for the gown prevents unexpected interaction between the magnetic field and the patient’s clothing, avoiding potential delays or the need for a costly rescan. The procedure for changing into a gown is quick and includes a secure location for storing personal belongings.