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Medical Imaging

MRI > MRI Safety

Prior to booking an MRI examination, please ensure that the MRI Patient Screening Information form is completely filled out and sent to the MRI department.

The following lists offer guidelines for contraindicated and MRI-compatible devices. If you require more information, please call the MRI staff at 416-360-4000 Ext. 5661.

Contraindicated Objects/Implanted Devices

  • cardiac pacemaker
  • implanted cardiac defibrillator
  • neurostimulator
  • any type of implanted biostimulator
  • any type of internal electrode(s), including pacing wires and cochlear implants
  • implanted insulin pump
  • Swan-Ganz catheter
  • any type of electronic, mechanical or magnetic implant
  • implanted drug infusion device
  • metallic foreign body in the eye (if suspected, please have plain orbit X-rays taken prior to the procedure)
  • any type of intravascular coil, filter, stent (some are compatible, check with MRI suite)
  • ear implants (some are compatible, check with MRI suite)
  • aneurysm clips (some are compatible, please submit operative notes for review by radiologist)
  • shrapnel or bullets (may not be contraindicated, check with MRI suite)

Compatible Objects or Devices

  • surgical clips - time frame six weeks post-op
  • staples - ideally removed
  • vascular access ports
  • intraventricular shunt
  • HALO vest
  • diaphragm
  • IUD
  • penile prosthesis (most are compatible, check with MRI suite)
  • wire mesh
  • pessary
  • any implanted orthopedic items (such as pins, rods, screws, nails, clips, plates, wires, etc)
  • heart valve prosthesis (most are compatible, check with MRI suite)

Although these items are compatible, they can cause severe distortions on the images in the area of the implant.

Objects to be Removed

  • hearing aid
  • orbital/eye prosthesis
  • any type of implant held in place by a magnet
  • artificial limb
  • clothing containing metallic snaps or zippers
  • hair pins
  • wigs
  • jewelry
  • dentures
  • eyeglasses
  • credit cards, bank cards and anything else with a magnetic encoding (will be erased by the magnet)
  • metallic objects from your pockets

Metal objects can become dangerous projectiles if they are taken into the scan room. They can be pulled out of pockets and off the body without warning and fly toward the opening of the magnet at very high speeds, posing a threat to anyone in the room. The more mass an object has, the more dangerous it can be because of the force with which it is attracted to the magnet.