The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)

Fig. 2. —Graph shows measurement of calcium standards on electron beam CT (solid line) and helical CT (dotted line). Mean CT attenuation is shown for each of four standard calcium concentrations in calibration phantom (0, 50, 100, and 200 mg/ml). Imaging of standard regions of interest was performed at level of left main coronary artery in study participants.