Noninvasive imaging techniques that can assess plaque morphology and characteristics include Three-dimensional vascular ultrasonography, which can be used to assess plaque in the carotid and other arteries Computed tomography (CT) angiography, which is used clinically to identify significant lesions in the coronary arteries Magnetic resonance (MR) angiography, which is used sometimes to image large arteries (eg, aorta) Invasive catheter-based tests are also used.