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Figure 1 Integrated backscatter (IB) image from the carotid artery. (A) Conventional ultrasound image of common carotid artery. Intima-media thickness and diameter of artery were measured on conventional ultrasound image. Bar = 1 cm. (B and C) Integrated backscatter values in the entire far wall of the arteries (an angle span of 30° between –15° and +15°) were measured. The IB values were determined averaging the IB values from 10 sites continuously moving the region of interest above the far arterial site. Also, IB values of arterial lumen were measured just above far wall shown by an asterisk. Bar = 1 cm.