doppler ultrasound of an artery multimedia

Courtesy of Intermountain Medical Imaging, Boise, Idaho. Figure 1 shows a color Doppler ultrasound picture of blood flowing through a normal artery (red) and vein (blue). Figure 2 shows an ultrasound picture of an artery narrowed by the buildup of calcium and fat (cholesterol) in the inner lining of the artery, called...