中文摘要：

目的探讨基于噪声的低电流扫描联合低电压技术对冠状动脉CTA（CCTA）图像质量和辐射剂量的影响。方法纳入因疑似冠心病而接受CCTA的156例患者，其中常规电压组103例，采用基于噪声的低电流扫描，管电压120kV；低电压组53例，低电流扫描同时联合低电压技术，管电压100kV。比较两组图像质量评分、CT值、噪声、SNR、CNR值及有效辐射剂量的差异。结果低电压组图像质量评分、CT值、噪声、SNR和CNR值均大于常规电压组（P均〈0．05）；两组辐射剂量差异无统计学意义。结论基于噪声的低电流扫描联合低电压技术可实现个性化低剂量扫描，同时提高CCTA图像质量。

英文摘要：

Objective To evaluate the effect of noise-based low tube current scanning combined with low kilovoltage on image quality and radiation dose in coronary CT angiography （CCTA）. Methods Totally 156 patients of suspected coronary artery disease who underwent CCTA with prospective ECG-triggering were involved. The patients were divided into regular kilovoltage group （n-----103） scanned with noise-based tube current and normal kilovoltage （120 kV）, and low kilo- voltage group （n=53） scanned with noise-based tube current and low kilovoltage （100 kV）. Image quality, CT value, noise, SNR, CNR and radiation dose were compared between the two groups. Results In low kilovoltage group, image quality score, CT value, noise, SNR and CNR value were all higher than those in regular kilovoltage group （all P~0. 05）. There was no significant difference in radiation dose between the two groups. Conclusion Noise-based low tube current scanning combined with low kilovoltage can not only decrease radiation dose but also improve image quality in CCTA.