Coronary artery calcium quantification with retrospectively gated helical CT: Protocols and techniques

Current generation Helical Computed Tomography, when coupled with cardiac g ating can be used to measure coronary vascular calcium. In this article we review the development of retrospectively gated helical computed tomography on a single slice HCT system and its relation to electron beam CT. The imp act of heart rate on selection of helical pitch for the creation of a diast olic image set is detailed, as well as, scanning and post-processing techni ques are discussed. The development and initial experience of cardiac gatin g with multidetector CT systems is presented.