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Fig. 1. —Opacity curve and histogram for volume rendering of coronary arteries. Typical CT histogram shows number of voxels with specific voxel values (CT number). Each CT number can be assigned certain tissue composition. Default tissue compositions consist of air, fat, soft tissue, and bone, with each tissue represented by specific peak in histogram. Tissue composition is identical for each CT scan. Line representing opacity shows maximum opacity for bone and contrast-enhanced blood and low opacity (30-40%) for fat and soft tissue. Air is fully transparent.