Can You Have An Mri With A Bullet In Your Body?

Yes, in some cases you can have an MRI with a bullet in your body, but it depends on the bullet’s metal composition and exactly where it is located. If the bullet contains ferromagnetic metals like iron or steel, the MRI’s strong magnetic field can pull on it, causing it to move or heat up, which can be dangerous—especially near a blood vessel, the spine, or the eye. If the bullet is made from a non‑ferromagnetic metal such as lead or copper, the risk of movement is much lower, but radiologists still perform a careful safety check before any scan.

What Happens to Metal in an MRI Machine?

An MRI uses a very strong, constant magnetic field (typically 1.5 to 3 Tesla) to create detailed images of the body’s soft tissues. Any metal that is ferromagnetic—meaning it can be magnetized—will be pulled toward the magnet, like a paperclip to a refrigerator magnet. The force depends on the size, shape, and distance from the magnet.

For a bullet inside the body, that pulling force can be enough to shift the bullet. Movement of even a few millimeters can tear tissue, damage a nerve, or puncture a blood vessel. In addition, metal can heat up during the MRI scan because the radio frequency pulses induce electric currents in it. Ferromagnetic materials also create large distortions (artifacts) in the image, making the scan less useful.

Non‑ferromagnetic metals, like most lead, copper, and aluminum, do not respond to the magnetic field, so they won’t move. But they can still heat up and will definitely cause image artifacts. For bullets that are non‑ferromagnetic, the risk is mainly about heating and image quality—not about projectile motion.

When Is It Dangerous to Have an MRI with a Bullet?

The danger is highest when a bullet is ferromagnetic (contains iron or steel) AND is located in or near a critical structure. That includes the brain, spinal cord, eye, major arteries, heart, or a joint that can move. A bullet in the chest or abdominal wall made of steel is still risky because it can shift toward the magnet, but the risk is lower if it’s far from vital organs.

Some older bullets or jacketed bullets (like full metal jacket military rounds) have a lead core but a steel jacket. Steel is ferromagnetic. Even a thin steel jacket can cause movement. Shotgun pellets are often lead (non‑ferromagnetic) but some are steel (used for waterfowl hunting)—those steel pellets are dangerous because many small projectiles can move independently.

Location also matters for heating. A bullet near the skin can heat up enough to cause a burn. A bullet deep inside the body may heat less because surrounding tissue absorbs the energy, but the risk is still present. Radiologists use specific standards (called “MR Safe” or “MR Conditional” guidelines) to determine if a metallic object is safe for scanning.

How Do Doctors Decide If an MRI Is Safe?

Before any MRI, every patient completes a detailed screening questionnaire that asks about metal in the body—including bullets, shrapnel, implants, and tattoos. If you have a known bullet or fragment, the radiology team will investigate further.

The first step is often an X‑ray or CT scan to locate the bullet precisely and see its shape and density. A radiologist looks at the images to guess the metal type. Ferromagnetic bullets usually appear very bright on CT, but the only way to know for sure is to check the bullet’s composition—which is rarely known unless it was surgically removed and analyzed.

When the metal is uncertain or the location is critical (brain, eye, spine), most hospitals will not perform an MRI. They may use alternative imaging such as CT or ultrasound instead. For bullets that are clearly non‑ferromagnetic (for example, a known lead bullet from a low‑velocity handgun that has been in the body for years without causing symptoms), the scan may go ahead with caution, including keeping the patient awake and monitoring for any sensation of pulling or heat.

There are also official guidelines from the American College of Radiology and other bodies that help radiologists make these decisions. They classify bullets as “MR Unsafe” if ferromagnetic or if location is high‑risk, and “MR Conditional” if non‑ferromagnetic and in a safe location.

What if the Bullet Is Not Magnetic?

Most modern bullets are made of lead (which is not magnetic) with a copper or brass jacket (also not magnetic). These bullets do not respond to the magnetic field, so they will not move during an MRI. The main concern becomes heating and image quality.

Heating is possible but generally less dangerous than movement. The radio frequency pulses can cause eddy currents in the metal that generate heat. For a small bullet, the temperature rise is usually small—a few degrees Celsius—but if the bullet sits near a nerve or the skin, even a small increase could cause pain or injury. Radiologists can reduce the risk by using lower‑power sequences or limiting the scan time.

Image quality is almost always affected. The metal creates a large black void (artifact) around it, masking nearby anatomy. If the area of interest is the bullet itself or the tissue right around it, the MRI may not be helpful. In that case, a CT scan or ultrasound might give better information.

What About Bullet Fragments or Shotgun Pellets?

Bullet fragments can be even more dangerous than a single intact bullet because multiple small pieces can move independently. Shrapnel from military explosives often contains steel and is strongly ferromagnetic. Shotgun pellets are typically lead (non‑magnetic), but steel pellets (used for waterfowl hunting) are magnetic. If you have many steel pellets scattered in the body, the magnetic forces can pull on each one, potentially causing widespread tissue damage.

Doctors will try to determine the pellet material from the type of ammunition or from X‑ray appearance. Steel pellets look slightly different on X‑ray than lead, but it can be hard to tell. If uncertainty remains, MRI is usually avoided.

For patients with retained bullet fragments from a past injury, the risk does not go away over time. Scar tissue can hold a bullet in place, but the MRI force may still overcome that. Old bullets can also roughen and change shape, but their magnetic properties remain the same. There is no safe time window—each case must be evaluated individually.

What Should You Tell Your Doctor Before an MRI?

If you know you have a bullet or any metal fragment in your body, tell the MRI staff before the scan. Be specific: how many bullets, where they are, what you know about the ammunition (e.g., handgun, rifle, shotgun, military). Even if you think the bullet is old or harmless, mention it.

If you are unsure whether a past injury involved bullet fragments, say so. The MRI team can order an X‑ray to check. Never assume that because you had a previous MRI without issue, it is safe again—metal can shift over time or different scanners have different field strengths.

Also, report any history of working with metal (grinding, welding, machining) that could leave tiny ferromagnetic fragments in your eyes, which can be more dangerous than a bullet. Eye metal fragments can cause blindness if moved by the magnet.