Information for patients undergoing a Magnetic resonance imaging (MRI) scan.
What you should know:
MRI is a diagnostic technique that uses radio frequency waves in a magnetic field for imaging. No rays or radioactive substances are used.
The scan takes between 20 and 60 minutes. It is essential patients do not move during this time and try to breathe gently. You should be aware the scan will not work if you move.
Some people may feel short of breath or overwhelmed inside the machine although this is unlikely as it is an open unit. If this happens you should breathe easily. Remember you will be constantly monitored by the technicians performing the test and you will be able to communicate with them via a remote control.
The device generates noise. This is a feature of the machine and no cause for worry.
The technicians will explain the process and what the scan consists of. If you have any doubts or questions, do not hesitate to ask them.
It is essential to enter the room without any metallic objects (glasses, watches, hairclips, removable metal bridge etc.) or magnetics strips (credit cards, transport cards) or inside the body (pacemakers, heart valves etc.).
If the scan is in the cranium, no make-up or hairspray should be worn.
In order to study certain cases better, it may be necessary to use a contrast agent (a dye) which is injected into the vein. Please note allergic reaction to this agent is extremely uncommon.
WARNING: The administration of an intravenous contrast agent cannot generally be predicted in advanced. The radiologist will decide during the scan if the injection of a contrast agent is essential for a correct patient diagnosis.