Alternate Names : MRI, Chest, Chest Magnetic Resonance Imaging, Magnetic Resonance Imaging, Chest
Magnetic Resonance Imaging (MRI) is a noninvasive imaging technique. It is used to view organs, soft-tissue, bone, and other internal body structures. In a chest MRI, the person's body is exposed to radio waves while in a magnetic field. Cross-sectional pictures of the chest are produced by energy emitted from hydrogen atoms in the body's cells. An individual is not exposed to harmful radiation during this test.
Who is a candidate for the test?
A chest MRI can be used for a variety of purposes. This technique can be used to diagnose:
heart and vascular disease
disorders affecting the airways and chest wall
diseases of the heart valves, chambers and muscle
tears in the aorta, the body's largest artery
How is the test performed?
Before the test, the doctor will ask if the person:
has any drug allergies, or history of allergic reaction to medications
is allergic to shellfish, or foods with added iodine such as table salt
has experienced claustrophobia, or anxiety in enclosed spaces. If this is a problem, mild sedating medication may be given.
A woman will also be asked if she might be pregnant.
As the test begins, the person lies on a flat platform. The platform then slides into a doughnut-shaped magnet where the scanning takes place. To prevent image distortion on the final images, the person must lie very still for the duration of the test.
Commonly, a special substance called a contrast agent is administered prior to or during the test. The contrast agent is used to enhance internal structures and improve image quality. Typically, this material is injected into a vein in the arm.
The scanning process is painless. However, the part of the body being imaged may feel a bit warm. This sensation is harmless and normal. Loud banging and knocking noises are heard by the person during many stages of the exam. Earplugs are provided for people who find the noises disturbing.
After the test, the person is asked to wait until the images are viewed to see if more images are needed. If the pictures look satisfactory, the person is allowed to leave.