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Figure 7. Calcium mass score measured in a rotating insert of an anthropomorphic cardiac phantom scanned on 16– and 64–detector row CT systems with CAC protocols and multiple gantry rotation times (0.33, 0.37, 0.42, and 0.5 seconds). HA = hydroxyapatite concentration in milligrams per cubic centimeter; the diameter of the calcification is given in millimeters. (For example, 400 HA 3 mm corresponds to 400 mg/cm3 HA density and a 3-mm-diameter cylinder.)
