IMT (intimal media thickness) scanning is the most accurate non-invasive screening method available for predicting the risk of heart attack or stroke. Over your lifetime, genetic and environmental factors may cause inflammation on the inner walls of your artery. A sticky substance called plaque builds up inside your blood vessels. The blood vessels may weaken or become so clogged that the blood supply to affected parts of the body is reduced or blocked. The flow of blood may also be affected when the plaque ruptures and causes a blood clot (thrombus) blocking or clogging the blood vessel. IMT screening is supported by the American Heart Association as "an independent predictor of TIA, stroke and coronary heart disease". Call or ask your doctor if this important screening exam may be right for you.