The MRI is a non-invasive and non-radiating imaging technique. A magnetic field is induced by a powerful magnet. Radio waves are sent over the body. The produced signal is recorded by sensors, called antennas, placed or not on the patient. Finally, detailed and highly contrasted 2D images are obtained based on the composition and nature of the tissues and organs being imaged.
Previously, an eligibility questionnaire for the test will be filled out jointly with a health professional (doctor, nurse). This questionnaire will be re-checked by the MRI technologist on the day of the exam; A blood test may be necessary before obtaining an appointment. No preparation is required; The patient must remove all accessories from their body (watch, jewelry, denture, hair extensions, etc.); The patient lies down on a table for the entire duration of the exam. This table slides into the doughnut-shaped device; The technical staff ensures the comfort of the patient, who must remain still for the entire duration of the exam. Microphones and speakers allow for communication at all times between the patient and the present technologist; An injection of gadolinium-based contrast agent may or may not be administered to the patient during the exam; The exam lasts between 30 and 60 minutes.
Some people who are afraid in confined spaces may experience anxiety. If necessary, a sedative can be prescribed at the pharmacy before the exam. Slight risk of an allergic reaction to the contrast agent. Normally, no pain or abnormal sensation is felt during the exam. There are rare cases of burning. The machine produces intense noise that could disturb some people. The exam is avoided in pregnant women in the 1st trimester. The safety has not yet been definitively demonstrated for embryos.