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Fig. 5 —CAC measurement algorithm. Graph shows mean variability by
Agatston score (white bars), volume score (gray bars), and
mass score (black bars). Reduction of variability by volume scoring
algorithm was effective only on electron beam CT (p = 0.05). Mass
scoring algorithm was effective on electron beam CT (p < 0.01),
2.5-mm helical CT (p < 0.01), and 2.5-mm axial CT (p =
0.02). Variability in volume and mass measurements for EBCT was almost the
same as for helical CT protocols.
