- MRI Scan
What is it?
Magnetic Resonance Imaging, commonly called an MRI, is a painless way of producing very detailed pictures of body tissue and organs without using an x-ray. Using a large magnet, radio waves and a computer, an MRI scans the patient's body and produces two or three dimensional images which are viewed on a monitor.
Where do I get an MRI?
All MRIs in Ontario are located in hospitals.
Why is an MRI important?
An MRI is an important tool when getting information about a patient's body that may not be seen in any other way. This modality makes it possible to produce images of tissue and can provide important information about the brain, spine, joints and internal organs.
What to expect?
A patient is placed on a special table and positioned inside the MRI unit, which is tunnel-like, for the exam. The patient will hear a tapping-like noise intermittently during the exam and the hum of the machine. These are both a part of the procedure. A speaker is installed in the magnet so you are able to communicate with the technologist operating the MRI.
Patients should notify their physicians if they are claustrophobic (fear of closed in spaces), have a pacemaker or think you are pregnant. Patients who are claustrophobic may be given medication.
In some cases patients may receive an injection of contrast dye (imaging enhancement medium) which helps make the details in your MRI images clearer. It is normally injected through a vein in your arm.
How long does it take?
An MRI usually takes between 30 and 60 minues.
Preparation for the exam
Prior to the MRI you will be asked a series of questions about your medical history, and may be asked to bring a medical history and provide a list of medications being taken. Patients may continue with their normal diet. There are no after effects of a scan, and a patient is able to drive himself or herself to and from the exam. Patients who received medication because of claustrophobia may not be able to drive for a long period of time following the exam.
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