A Computed Tomography (CT) scan uses X-rays and computer processing to create detailed cross-sectional images of bones, soft tissues, and blood vessels, helping physicians diagnose medical conditions. Proper preparation, especially concerning clothing, is necessary to ensure high-quality images. Certain materials on or near your body can interfere with the imaging process, potentially requiring a repeat scan and delaying results.
Clothing Requirements for a CT Scan
The ideal clothing for a CT scan is loose-fitting, comfortable apparel made entirely of natural fibers, such as cotton. The X-ray beams used in the scan are highly sensitive to metal, which causes bright streaks or blotches known as artifacts on the image. Therefore, you must avoid clothing that features any metal whatsoever, as even small components can distort the resulting images.
Common culprits for image interference include zippers, snaps, buckles, and metal buttons. Garments such as underwire bras, pants with metallic thread accents, or shirts with metal eyelets should also be left at home. These materials scatter the X-ray beam, creating shadows that can obscure internal anatomy and hinder accurate diagnosis.
Non-Clothing Items That Must Be Removed
You must remove all accessories and personal items that contain metal before entering the scanning room to eliminate sources of image artifacts. The most frequent items that must be taken off are all forms of jewelry, including necklaces, rings, bracelets, and earrings.
Body piercings, even those not in the immediate scan area, should be removed if possible, as they can still affect image quality. Other items to remove include hairpins, hair clips, watches, and belts with metal buckles. Patients with hearing aids or removable dental work, such as dentures or retainers, will also be instructed to take these out before the procedure.
When Changing Into a Gown Is Necessary
The facility may require you to change into a provided medical gown, even if your clothing is metal-free. This is often necessary when the scan requires contrast dye, which is administered through an intravenous (IV) line. Changing into a gown simplifies the process of placing and managing the IV access.
Gowns are also required for scans targeting the torso (chest, abdomen, or pelvis) to ensure clothing does not interfere with the region of interest. This prevents any overlooked metal components from compromising the images, and staff will guide you through the process in a private changing area.