It is an imaging technique that uses a strong magnetic field, radio waves and a computer to create detailed images of the aorta, your largest artery. The aorta is responsible for delivering oxygen-rich blood to your entire body. A contrast material is injected to enhance visibility and identify defects and blood flow abnormalities. Your doctor may use this test to find out diseases such as aortic aneurysm (a bulge in the blood vessel wall), aortic dissection, aortic regurgitation or aortic stenosis, congenital heart defects, such as double aortic arch, inflammation of the aorta, also called Takayasu’s arteritis, injury to the aorta from trauma, peripheral artery disease and recurring chest pain.