Prospectively gated axial CT coronary angiography: comparison of image quality and effective radiation dose between 64- and 256-slice CT.

Purpose: To compare image quality and effective radiation dose for prospectively gated axial CT coronary angiography on 64- and 256-slice CT.

Methods: The patient cohort consisted of 80 consecutive patients undergoing imaging with 256-slice CT and 80 patients with 64-slice CT. The two patient groups were demographically matched according to age, gender, body mass index and heart rate.