Cardiac computed tomography (CT) scan techniques

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Cardiac computed tomography (CT) scan techniques Cardiac computed tomography (CT) scan techniques. The spiral scan mode can be performed by continuous exposure (green) or with electrocardiogram (ECG)-triggered tube modulation and nominal exposure limited to the phase(s) of interest. Depending on the selected table speed and heart rate, a degree of overlap will be created between the consecutive acquisitions per heart cycle. Axial scan protocols minimize the exposure to the phase of interest but can be extended to allow for reconstruction of more phases (padding), with minimal longitudinal overlap between acquisitions. Second and third dual-source CT systems can perform high-pitch spiral scans, in which case all data are acquired (over a longer interval) within a single heart cycle. The purple bar superimposed over the ECG represents the minimal exposure duration for reconstruction of a single dataset/phase. Source: Computed Tomography of the Coronary Arteries, Interventional Cardiology, 2e Citation: Samady H, Fearon WF, Yeung AC, King III SB. Interventional Cardiology, 2e; 2017 Available at: http://accesscardiology.mhmedical.com/DownloadImage.aspx?image=/data/books/1986/intercard2_ch12_f003-1.png&sec=161618522&BookID=1986&ChapterSecID=161618506&imagename= Accessed: October 20, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved