Recent MRI Safety Issues
- ParaGard Intrauterine Device. We have just excluded a participant from MRI due to the ParaGard Intrauterine Device. While this device has limited support for use with 1.5 Tesla MRI, there is no support for use with 3 Tesla MRI. http://www.drugs.com/pro/paragard.html Limited data suggest that MRI at the level of 1.5 Tesla is acceptable in women using ParaGard®. One study examined the effect of MRI on the CU-7® Intrauterine Copper Contraceptive and Lippes Loop™ intrauterine devices. Neither device moved under the influence of the magnetic field or heated during the spin-echo sequences usually employed for pelvic imaging.10 An in vitro study did not detect movement or temperature change when ParaGard® was subjected to MRI.11. Mark AS, Hricak H. Intrauterine devices. MR imaging. Radiology. 1987;162:311-314.
- Work with Metal. In cases where subject has worked with metal and had to get eyes washed out due to the metal, he/she needs to get to get an orbital x-ray and have it cleared by a radiologist. Unless this is performed and we have a formal letter from the radiologist no scans will be scheduled.
- Meniere's Disease. People with Meniere's Disease may experience some nausea when being put into the magnet and they should be entered in slowly. Also, let them know about this potential and for them to be extra careful to squeeze the ball in the case that they experience discomfort.
- Braces in the Mouth. Braces can cause image distortions and in most cases participants with braces should not be scanned.
- Copper in the Toe. We have recently rejected a participant for MRI scanning due to the copper in the toe.
- Underwire Bra. Participants wearing an underwire bra should change into clinical garments available in the bin next to the MRI control room.
- Possibility of Pregnancy. One of our female participants stated that she was trying to become pregnant. As it turned out she meant that she was planning, but not actively trying to conceive. Although MRI has not been shown to adversely affect the course of pregnancy, no pregnant women should be admitted for scanning. If there exists any doubt that the participant may be pregnant, or if the participant admits to actively trying to become pregnant - the scanning should be cancelled.
- Overweight Participants. For obese patients, the MRI scanner supports up to 200 kg (400 pounds), without table movement restrictions. Due to the limited bore of the magnet, width should come into consideration with extremely bulky patients.