Dual-source CT cardiac imaging: initial experience |
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Authors: | Thorsten R C Johnson Konstantin Nikolaou Bernd J Wintersperger Alexander W Leber Franz von Ziegler Carsten Rist Sonja Buhmann Andreas Knez Maximilian F Reiser Christoph R Becker |
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Institution: | (1) Department of Clinical Radiology, University of Munich–Grosshadern Campus, Marchioninistrasse 15, 81377 Munich, Germany;(2) Department of Cardiology, Medical Clinic I, University of Munich–Grosshadern Campus, Marchioninistrasse 15, 81377 Munich, Germany |
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Abstract: | The relation of heart rate and image quality in the depiction of coronary arteries, heart valves and myocardium was assessed
on a dual-source computed tomography system (DSCT). Coronary CT angiography was performed on a DSCT (Somatom Definition, Siemens)
with high concentration contrast media (Iopromide, Ultravist 370, Schering) in 24 patients with heart rates between 44 and
92 beats per minute. Images were reconstructed over the whole cardiac cycle in 10% steps. Two readers independently assessed
the image quality with regard to the diagnostic evaluation of right and left coronary artery, heart valves and left ventricular
myocardium for the assessment of vessel wall changes, coronary stenoses, valve morphology and function and ventricular function
on a three point grading scale. The image quality ratings at the optimal reconstruction interval were 1.24±0.42 for the right
and 1.09±0.27 for the left coronary artery. A reconstruction of diagnostic systolic and diastolic images is possible for a
wide range of heart rates, allowing also a functional evaluation of valves and myocardium. Dual-source CT offers very robust
diagnostic image quality in a wide range of heart rates. The high temporal resolution now also makes a functional evaluation
of the heart valves and myocardium possible. |
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Keywords: | Dual source CT Coronary CT angiography Coronary artery disease Heart valves Left ventricular function |
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