An MRI scanner creates a strong magnetic field and uses radio waves to create incredibly detailed images of the body. MRI Does not rely on the type of radiation (i.e. Ionising radiation) used for an X-Ray or Computed Tomography (CT) scan. During the MRI examination, the patient is placed within the MR system or “scanner” – typically a large donut-shaped device that is open on both ends. An MRI exam causes no pain and, importantly, the electromagnetic fields produce no known tissue damage of any kind. The MR system may make loud tapping, knocking, or other noises at times during the procedure

Risks and Benefits

Certain metallic objects can be affected by the powerful magnetic field, and these are known as “ferromagnetic” objects, causing them to move suddenly and with great force towards the centre of the MR system. This may pose a risk to the patient or anyone in the way of the object. Therefore, great care is taken to prevent ferromagnetic objects from entering the MR system room. It is vital that you remove metallic objects in advance of an MRI exam, including watches, jewellery, and items of clothing that have metallic threads or fasteners.
Before an MRI scan will be conducted a screening procedure for Metallic objects or implants.

Risk for Sound levels (dB) and examples

MRI noises can range anywhere from 65 decibels to 130 decibels. They can often go above 90 to 100 decibels, requiring the patient to wear ear protection. For your reference, common loud noises measure at these decibel levels:
70 dB: Alarm clock or vacuum cleaner
94 dB: Food processor or blender
120 dB: Jet plane take-off

(Note for 3T scanner : Is fitted with the reduced noised technology “Pianissimo Zen® “