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Figure 1 (Top) Topography of the atherosclerotic disease in the ascending aorta as evaluated by epiaortic ultrasound. The frequencies describing the distribution and extent of the disease were converted into colored maps The color depicts a linear grading of frequencies, where a high percentage is represented by dark red and a low percentage by dark blue. (Bottom) Method for mapping the ascending aorta. To describe the exact location and distribution of the atherosclerotic disease, the ascending aorta was divided into three equal transverse (proximal, middle and distal third) and four equal longitudinal segments (anterior, posterior, lateral and medial), producing 12 segments in total.