Techniques and Protocols for Acquisition and Display of Contrast-Enhanced CT Angiography
Contrast-enhanced computed tomography (CT) studies of the coronary arteries were performed first to visualize the vessel lumen and to achieve an angiographic-like presentation of the coronary arteries in combination with 3D postprocessing methods (1). Because short exposure times are essential for coronary CT angiography (CTA), investigations initially were performed with electron beam CT (EBCT) scanners. These dedicated cardiac CT scanners were originally designed to measure myocardial perfusion (2). For morphological assessment of cardiac structures, a restrictive scan protocol with EBCT allows for 100-ms exposure time, 3-mm slice thickness, and 130-kVp, 630-mA electron-gun power. The acquisition of every single slice is triggered prospectively by the electrocardiogram (ECG) signal at the end systolic phase of the cardiac cycle.
KeywordsCatheter Caffeine Peri Cardiol Atropine
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