MRI – Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a diagnostic medical imaging examination utilizing magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body. MRI does not involve X-rays or the use of ionizing radiation, which distinguishes it from CT or CAT . It is an excellent imaging technique to assess the soft tissues of the body, ligaments, tendons, joints, organs, spine, and brain. A study typically takes about 15-20 mins to complete.

Patient Preparation

Patients are required to arrive at least 30 minutes prior to the start of their scheduled exam.

If you have had a significant eye injury while working with metal, you will require an X-ray of your eyes ordered by your physician to ensure there are no metallic foreign bodies present.  You may not be suitable for an MRI if there are certain types of implants or medical devices in your body, have a pacemaker, or if you are pregnant.

Before the exam starts, you will be required to fill out a few forms. Depending on which part of your body is being scanned, you may need to change into a gown during the procedure. If you prefer to wear your own clothes, they should not have metal zippers, fasteners, buttons, underwire (bras), belts or buckles, as the MRI scanner produces strong magnetic fields. It is also important to remove any loose metal objects from your body, including:

  • watches
  • jewelry (such as earrings and necklaces)
  • piercings (such as ear, nipple and nose rings)
  • dentures (false teeth)
  • hearing aids
  • wigs (some wigs contain traces of metal)

We recommend that patients show up without wearing any jewelry, hair pins, piercings or makeup for their exam.

Some MRI scans involve having an injection of contrast dye. This makes certain tissues and blood vessels show up more clearly and in greater detail.  The contrast dye is administered through an IV in your arm.

During the MRI scan you will be asked to lay very still for a prolonged period of time. You may also be asked to hold your breath for a few seconds while the scan is being taken. MRI scans usually require 20 minutes, but some types of exams can take longer to finish.


The Emerald Centre
10 Kingsbridge Garden Circle
Mississauga ON L5R 3K6
(905) 568-3768

300 Harwood Ave. South
Ajax ON L1S 2J1
(905) 426-8976



MRI – Magnetic Resonance Imaging May 9, 2019