Loose, comfortable clothing without metal components in the area being scanned is the simplest answer. Cotton sweatpants and a plain T-shirt or pullover will get you through most CT appointments without needing to change into a hospital gown. The specifics depend on which part of your body is being imaged, though, because metal only causes problems when it sits inside or near the scanner’s field of view. Understanding that one principle can save you time, spare you the indignity of a paper-thin gown, and help the technologist get cleaner images on the first pass.
Why Metal Is the Real Issue
A CT scanner fires X-ray beams through your body from many angles and reconstructs those signals into cross-sectional images. Metal objects absorb or scatter X-rays differently than soft tissue and bone, producing bright streaks or dark voids on the final images called artifacts. These artifacts can obscure the anatomy your doctor actually needs to see, and in some cases they can make a scan unreadable enough that it needs to be repeated. 1Journal of Clinical Orthopaedics and Trauma. Methods to address metal artifacts in post-processed CT images – A do-it-yourself guide for orthopedic surgeons The concern isn’t about safety to you personally. Metal zippers, snaps, underwire, and belt buckles won’t burn you or heat up during a CT the way they might in an MRI. The problem is purely about image quality.
This is why you’ll hear the standard advice to avoid anything metallic. But “anything metallic” is vague, and most people walk into an imaging center wearing at least something with a button or zipper. The practical question isn’t whether metal is bad in theory. It’s which metal, where, and whether it actually matters for your specific scan.
What to Wear to Make the Visit Easier
The goal is to arrive in clothes that the technologist won’t ask you to remove. For most scans, that means:
- Pants: Elastic-waist sweatpants, yoga pants, or athletic shorts. No jeans with metal rivets, no belts, no zippers near the scan area.
- Top: A cotton T-shirt, crew-neck pullover, or similar top without metallic embellishments, snaps, or decorative studs. Avoid hoodies with metal zipper pulls if your chest, neck, or head is being scanned.
- Shoes: Slip-on shoes or sneakers you can remove quickly. You may or may not be asked to take them off, but easy-on, easy-off saves time.
- Undergarments: A sports bra or bralette without underwire is the safest choice for chest and abdominal scans. For scans below the waist or of the head, your regular bra is almost always fine.
The reasoning is straightforward. If the metal isn’t in the scan field, it doesn’t affect your images. Someone getting a head CT can wear jeans and a belt without a problem. Someone getting a chest CT should skip the metal zipper hoodie but doesn’t need to worry about the button on their pants.
The Bra Question
This is one of the most common points of confusion, and the answer is more reassuring than most people expect. A study comparing chest CT images of patients who wore bras (including bras with metal clasps or underwire) against those who did not found that no bra caused artifacts that influenced the diagnostic accuracy of the images.2Diagnostic Imaging. Wearing Bra During Chest CT Increased Effect of Dose Reductions In other words, the metal in a typical bra doesn’t ruin a chest CT.
There was actually an unexpected benefit. Patients who kept their bras on during the scan had a significantly greater amount of breast and glandular tissue positioned inside the zone where the scanner automatically reduces radiation dose. About 91 percent of breast tissue fell within that reduced-dose zone in the bra group, compared with roughly 60 percent in the no-bra group.2Diagnostic Imaging. Wearing Bra During Chest CT Increased Effect of Dose Reductions The bra compressed and repositioned the tissue in a way that happened to align it with the scanner’s dose-modulation algorithm, so patients actually received a lower effective radiation dose to the breast.
Despite this, many imaging centers still ask patients to remove bras for chest CTs as a blanket policy. This is partly tradition, partly caution. If you’re asked to remove yours, it’s worth knowing the evidence supports keeping it on, though ultimately you should follow the technologist’s instructions for your specific facility and scan protocol. For abdominal or pelvic CTs, a regular bra is well outside the primary scan field and almost never an issue.
Jewelry, Piercings, and Hair Accessories
Rings, bracelets, watches, and necklaces should come off before you arrive or at least before you enter the scan room. This isn’t because they’re dangerous, but because they create the same artifact streaks as any other metal in the field of view. A necklace will cause problems for a chest or neck CT. A ring will interfere with a hand or wrist scan. For a pelvic CT, that necklace probably doesn’t matter, but most technologists prefer you remove all jewelry as a precaution so nothing gets lost or forgotten.
Body piercings are trickier. If you can remove them easily, do so before a scan that covers that area. Tongue, lip, nose, or ear piercings should come out for a head or neck CT. Navel piercings matter for abdominal scans. If a piercing can’t be easily removed or you’re worried about a hole closing, tell the technologist before the scan starts. In many cases they can adjust the imaging protocol or determine that the piercing is far enough from the area of interest that it won’t matter. Metal hair clips and bobby pins are easy to forget about. Remove them for any scan involving the head.
Dental Work and Implants Inside Your Body
Things get more nuanced when the metal is permanently inside you. Dental fillings, crowns, implants, orthopedic screws, joint replacements, cardiac stents, and surgical clips can’t exactly be removed before a scan. These internal metals do produce artifacts, and the degree depends on the type and amount of metal as well as how close it sits to the anatomy being studied.
For dental implants specifically, newer CT technology can dramatically reduce artifacts. Using higher-energy image reconstructions, radiologists can bring image quality from unusable to excellent. Research on photon-counting CT scanners found that implant materials caused minimal or no artifacts at higher energy settings, with image quality rated as excellent by radiologists at those levels.3PMC. Virtual monoenergetic imaging for metal artifact reduction in dental implant surgery using photon-counting detector computed tomography At standard lower-energy settings, the same implants produced enough artifact to limit diagnostic interpretation.3PMC. Virtual monoenergetic imaging for metal artifact reduction in dental implant surgery using photon-counting detector computed tomography
The practical takeaway is that you should always tell the technologist about any metal implants or hardware in your body, even if it seems obvious. They’ll adjust their scanning technique, select artifact-reduction software, or note the hardware for the radiologist reading the images. You can’t do anything about internal metal, but flagging it helps the imaging team plan around it.
Medical Devices and Wearables
Continuous glucose monitors, insulin pumps, and other wearable medical devices raise a different concern. It’s not just about image quality but also about whether the scan could damage or interfere with the device itself. For MRI scans, many of these devices must be removed. CT scans are a different story.
Research testing continuous glucose monitoring sensors under high-exposure CT and X-ray conditions found that the sensors maintained functionality during and after imaging. The sensors were also easily visible and identifiable on the scan images, so they didn’t create diagnostic confusion. The conclusion was that patients can continue to wear and use their sensors during and after imaging.4PubMed Central. Safety and Functional Integrity of Continuous Glucose Monitoring Sensors When Used During Radiologic Procedures Under High Exposure Conditions This is meaningful for people with diabetes who rely on continuous monitoring and would rather not remove a sensor that has to be replaced if detached.
For insulin pumps, pacemakers, and other implanted or attached devices, the situation varies by manufacturer and model. CT scanners don’t produce the strong magnetic fields that MRIs do, so the risk profile is fundamentally different, but you should always mention any device to the imaging team. They can check the manufacturer’s guidelines and, if needed, temporarily disconnect a pump or adjust the scan to avoid the device’s location.
When You’ll End Up in a Gown Anyway
Even if you follow every clothing tip, some scans will still require a hospital gown. Full-body CTs, combined chest-abdomen-pelvis scans, and certain emergency scenarios typically call for a gown because the scan field is so large that nearly any clothing could wander into the images. Many emergency departments default to gowns regardless of what patients are wearing because speed matters more than wardrobe optimization.
If you know you’ll be given a gown, the clothing question becomes more about convenience and comfort during the wait. Wear something easy to change in and out of. Some people bring a robe or an extra layer to wear over the gown in the waiting area. Keep your belongings minimal so you aren’t worried about valuables while you’re on the table.
For outpatient scans of a specific body part, like a sinus CT, a head CT for headaches, or a knee CT after an injury, gowns are often unnecessary as long as your clothing cooperates. A lot of the discomfort people associate with imaging visits comes from the assumption that they’ll need to strip down. In practice, if you dress thoughtfully, you may keep your own clothes on the entire time.
Contrast Dye and What It Means for Your Clothing
Many CT scans involve injecting an iodine-based contrast agent through an IV in your arm. The contrast helps certain structures, especially blood vessels and organs, show up more clearly. This doesn’t change what you should wear in any meaningful way, but it does introduce a couple of practical considerations.
You’ll need a bare arm or hand for the IV line, so wearing a top with sleeves you can easily push up or roll past the elbow is helpful. Tight long sleeves that bunch awkwardly around the IV site can be uncomfortable. Some people feel warmth, mild nausea, or a metallic taste in their mouth when the contrast is injected. These sensations are temporary and normal, but in rare cases a patient may vomit. Wearing something you wouldn’t be heartbroken to clean is a minor but practical consideration.
The contrast itself is excreted through your kidneys over the hours following the scan, so you’ll be encouraged to drink extra fluids afterward. None of this interacts with your clothing choices in a technical sense, but it’s worth knowing so the visit doesn’t catch you off guard.
Modesty and Comfort During the Scan
For many people, the anxiety around a CT scan has less to do with the technology and more to do with feeling exposed or vulnerable. If modesty is important to you for personal, cultural, or religious reasons, it helps to know that CT scans are fast, typically lasting only a few minutes of actual scanning time, and you’re usually alone in the room during the scan itself. The technologist watches from behind a window and communicates through a speaker.
You can request a same-gender technologist at most facilities, though availability varies. If you wear a head covering and the scan doesn’t involve your head or neck, there’s generally no reason to remove it. For head scans, a fabric head covering without metal pins or clips can often stay on, but check with the facility in advance. Letting the scheduling team know about any modesty needs when you book the appointment gives them time to accommodate you rather than scrambling on the day.
If you do need to wear a gown, you can ask for a second gown to wear as a robe over the first, or bring a cotton wrap. Most imaging staff are used to these requests and will work with you. The clinical goal is getting a clean image, and as long as whatever you’re wearing doesn’t introduce metal artifacts in the scan field, the team has no reason to insist you remove it.
What About Tattoos and Cosmetics
Tattoos are a non-issue for CT scans. Unlike MRI, where certain old tattoo inks containing metallic pigments can cause localized heating or minor irritation, CT X-rays pass through tattoo ink without any interaction. You don’t need to cover, declare, or worry about tattoos for a CT.
Makeup and cosmetics are a slightly different matter, though mostly for scans of the face and head. Some mineral-based cosmetics, particularly those containing zinc oxide or titanium dioxide, can show up as faint bright spots on images. This rarely affects diagnostic quality, but if you’re getting a facial CT or a scan of the sinuses, going bare-faced eliminates any possibility of confusion. For chest, abdominal, or extremity scans, your makeup makes no difference.
Antiperspirant is worth mentioning because aluminum-based deodorants can occasionally create artifacts on mammography, and some patients assume the same applies to CT. It doesn’t. CT’s three-dimensional imaging approach handles small metallic particles much better than a mammogram’s two-dimensional compression image. You don’t need to skip deodorant for a CT scan.
A Quick Checklist by Scan Area
Because the guiding principle is “no metal in the scan field,” the practical advice varies by body region:
- Head or neck: Remove earrings, glasses, hearing aids, hairpins, necklaces, and any facial piercings you can. A plain cotton top is fine.
- Chest: Skip underwire bras or just know the evidence suggests they’re usually fine. Remove necklaces and any chest-level piercings. Wear a metal-free top or expect to change into a gown.
- Abdomen or pelvis: Elastic-waist pants, no belt, no jeans with metal rivets at the waist. Remove navel piercings. Your bra and necklace can stay.
- Extremity (arm, leg, knee): Roll up or remove clothing over the area. Typically no gown needed. Remove watches, bracelets, or ankle jewelry as applicable.
Arriving dressed for your specific scan saves you from the one-size-fits-all gown policy and helps the technologist get you on and off the table faster. If you’re unsure, call the imaging facility beforehand. They’d much rather answer a two-minute phone call about clothing than spend ten minutes helping you change and securing your belongings on the day of the scan.