Magnetic Resonance Angiography, the Best Technique to Evaluate Blood Vessels
MRA or magnetic resonance angiography is a technique that most commonly used for scanning the blockages of blood vessels. It is a group of technique that is based on magnetic resonance imaging. In many cases MRA can provide information that cannot be obtained from an X-ray, ultrasound, or CTscan. The technique is used to generate and evaluate images of the arteries for stenosis. MRA is often used for studying arteries of the neck and brain, the thoracic and abdominal aorta, the renal arteries, and the legs.
There are many method of using this technique the most common one is MRI contrast agents and other one is inflow angiography. The contrast medium is injected into a vein, and images are acquired during the first pass of the agent through the arteries. Provided that the timing is correct, this may result in images of very high quality. Inflow angiography is most commonly used in head and neck analysis. It uses a short echo time and flow compensation to make flowing blood much brighter than stationary tissue. This gives clear images of blood vessel and method is preferred only in certain specific situation.
As there are many benefits of Magnetic Resonance Angiography, there are draw back as well. Angiography may eliminate the need for surgery or if at all it is necessary, it can be performed more accurately. Although the strong magnetic field is not harmful in itself, implanted medical devices that contain metal may malfunction or cause problems during an MRI exam. The draw backs include limited clarity. MRA of small vessel is very difficult. It can not capture images of calcium deposits. So, there are some pros and cons of this technique.