Clinical efficacy of doronary CT angiography using dual-source CT

未使用β受体阻滞剂的双源CT(DSCT)在100次/分以上的患者获得了较好的质量。DSCT显示的图像质量明显优于单源CT(SSCT)，尤其是在心率较低的患者。所有血管的DSCT图像质量均显著低于SSCT。由于DSCT具有83ms的时间分辨率，因此在等容弛豫时间(IRT)阶段进行图像重建是可行的。在不减慢心率的情况下，DSCT的高时间分辨率显示出与SSCT相同的冠状动脉狭窄检测精度，这是因为它在IRT时进行了图像重建。给予硝酸甘油后，冠状动脉扩张，可评估节段数目增加。有冠状动脉斑块的节段未完全扩张，与正常节段不同。

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.