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Fig. 1B. —Axial electron beam CT scans of chest obtained in 74-year-old woman at level of proximal to middle portion of left anterior descending coronary artery show calcification. Computer software automatically highlights all pixels, with CT number > 130 H in yellow. After calculation of optimal attenuation threshold by adding 3 standard deviations (SD) to measured mean soft-tissue CT number, background noise disappears. In this example, mean soft-tissue CT number is 45 H with SD of 40 H, and calculated optimal threshold is 165 H.

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