What metals are safe for an MRI?
MRI Compatible Metals
- Titanium. Orthopedic surgeons favor titanium implants for their strength and compatibility with body tissues.
- Cobalt-Chromium. Though cobalt has magnetic properties, implants such as coronary stents made of cobalt-chromium alloy have tested safe during an MRI.
- Stainless Steel.
No, Open MRI imaging will not cause fillings in your teeth, if in proper condition, to dislodge or come out. The metal in most fillings is not affected by the MRI system's magnetic field. However, the fillings may cause some distortion of the images if you are having a scan of your neck, brain or facial area.
- The MRI Magnet is Always On The MRI Magnet is Always On The MRI Magnet is Always On Magnetic Field Hazards (cont.) Page 10 Contribute page Page 11 Displacement and Heating of Surgical Implants: Magnetic Field Hazards (cont.) Displacement and heating of these implants may cause a life-threatening situation!
- Even hairspray can contain traces of metal. We recommend not wearing any makeup the day of your scan, or removing your makeup before the scan. Although our open MRI scanner is spacious, it is still a very powerful machine that uses strong magnets. But speaking of makeup, here's one occasion you should wear it for.
- Some cosmetics contain metals that can interact with MRI magnets, so on the day of the MRI don't wear makeup or nail polish. Also, minimize hair products and forgo antiperspirants and sunscreens, which contain metals, just to be safe. Having an MRI? You may need an anti-anxiety drug.
If you have any metal on or in your body, an MRI can harm you. Even small amounts that will not harm your body can distort the MRI picture. In most cases, surgical staples, clips, plates, pins, and screws are not a risk during MRI scans if they have been in place for more than 4 to 6 weeks.
- Yes, dental implants are made of titanium. Titanium is a “non-ferromagnetic” metal, meaning patients can safely receive MRI (magnetic resonance imaging).
- If you're having a hip replacement you might be wondering if titanium is magnetic. It turns out that titanium is weakly magnetic (compared to other ferromagnetic materials) in the presence of an externally applied magnetic field. Titanium also exhibts the Lenz Effect but to a lesser extent that many other metals.
- Stainless Steel. Some stainless steel alloys have a very low reaction, or susceptibility, to magnetic fields. Medical supply companies sell stainless steel tools and accessories that staff can safely use in the MRI room. Stainless steel items such as dental braces can distort MRI images, however.
If you have metal or electronic devices in your body such as artificial joints or heart valves, a pacemaker or rods, plates or screws holding bones in place, be sure to tell the technician. Metal may interfere with the magnetic field used to create an MRI image and can cause a safety hazard.
- The most common ways for tattoos to hinder the results of a MRI scan depends on the size of a tattoo and the ingredients that were used to create the tattoo ink. Even certain ink colors can affect the body during a scan worse than others. The dye in deep red inks usually contains iron, which is magnetic.
- On very rare occasions, a few patients experience side effects from the contrast material, including nausea, headache and pain at the site of injection. Similarly, patients are very rarely allergic to the contrast material and experience hives, itchy eyes or other reactions.
- Wear comfortable, loose-fitting clothing to your exam. You may be given a gown to wear during the scan. Metal objects including jewelry, eyeglasses, dentures and hairpins may affect the CT images and should be left at home or removed prior to your exam.
Updated: 29th September 2018