MRI contraindications
Formal Definition
Conditions or implanted devices that may pose a safety risk or be damaged in the magnetic field of an MRI scanner; absolute contraindications include certain cardiac pacemakers, cochlear implants, and intraocular metallic foreign bodies; relative contraindications include other implanted devices, metallic clips, and retained shrapnel requiring individual device review.
How It's Used on the Ward
"MRI safe" or "can the patient go in the MRI?" or "screening for metal" — the safety checklist to confirm a patient with implants or metal can safely enter the MRI bore.
Example
""Before MRI brain for suspected MS: MRI safety screening shows patient has a deep brain stimulator placed 2 years ago. Neurology and radiology reviewing the device model — if MRI-conditional, can proceed with specific parameters. If not MRI-conditional, CT brain with contrast or alternative imaging needed. Do not place patient in the scanner until device safety is confirmed.""
Clinical Context
MRI-safe vs MRI-conditional vs MRI-unsafe: MRI-safe (no known hazard), MRI-conditional (safe under specific conditions — field strength, SAR limits, scan duration), MRI-unsafe (known hazards, contraindicated). Always check the implant database (MRIsafety.com) by device manufacturer and model number. Pacemakers: older generation are MRI-unsafe; many modern pacemakers are now MRI-conditional with specific protocols. Cochlear implants: most are MRI-conditional. Aneurysm clips: vary by manufacturer and year — neurosurgery must confirm. Tattoos: most are safe; some tattoo inks contain metallic pigments that can heat or cause artifact. Orthopedic hardware (rods, plates, screws): most are MRI-conditional and create artifact but are not a safety risk. External metallic objects (piercings, clothing) must be removed.
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