Clinical efficacy of doronary CT angiography using dual-source CT

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Relatively good quality of dual-source CT (DSCT) was obtained in patients with more than 100 bpm without use of beta blocker. DSCT showed a significantly better image quality than single-source CT (SSCT), especially in patients with low heart rates. The image quality of DSCT was significantly lower on a per vessels basis for all vessels than SSCT. The image reconstruction at the phase of isovolumetric relaxation time (IRT) is feasible in DSCT, because of its temporal resolution of 83 ms. High temporal resolution of DSCT shows equivalent accuracy of coronary stenosis detection to SSCT without reducing heart rate, because of its image reconstruction at IRT. The coronary artery was vasodilated and evaluable segments was increased in number by administration of the nitroglycerin. The segment with coronary plaque was not fully dilated, allowing the differentiation from the normal segment.