Coronary artery calcium measurement with multi-detector row CT and low radiation dose: comparison between 55 and 165 mAs.

Purpose: To prospectively compare the results of coronary artery calcium (CAC) measurements obtained with 55- and 165-mAs electrocardiographically gated multi-detector row computed tomography (CT).

Materials And Methods: Institutional clinical study review board approval and written informed consent were obtained. Fifty-one consecutive subjects (mean age, 59 years +/- 10) were scanned consecutively by using 165 and 55 mAs.