双源CT前瞻性心电触发技术用于脑血管成像的初步研究

目的 探讨双源Flash Spiral CT前瞻性心电触发序列(step-and-shoot,SAS)模式脑血管成像的图像质量及辐射剂量.方法 将43例临床怀疑脑血管性病变的患者,行前瞻性心电触发序列模式的脑血管造影术( SAS-CTA)扫描,采集期相:应用60％ R-R间期的ECG演示模式,对SAS-CTA做图像后处理,分析评价图像质量评分、统计辐射剂量及优良率.结果 评价SAS-CTA,图像质量评分为4.72±0.50,优良率达97.7％ (42/43),平均有效剂量为(0.216±0.01) mSv,SAS-CTA有效辐射剂量与双能量CTA( DE-CTA)比较降幅达到76.31％.结论 前瞻性心电触发序列模式应用于脑血管成像,可在保证图像质量的同时显著降低辐射剂量.

Cerebral angiography with prospective ECG triggering preliminary study of dual-source CT

Objective To study the image quality and radiation dose in dual-source CT cerebral angiography with prospective ECG-triggered sequence mode (step-and-shoot, SAS).Methods A total of forty-three patients with clinically suspected cerebral vascular disease underwent cerebral CT angiography with prospective ECG-triggering (step-and-shoot,SAS). Data acquisition was at 60% R-R interval of the ECG presentation mode. The post-processing included maximum intensity projection (MIP), multiplanar reformation (MPR) and volume rendering (VR). The CTA image quality, radiation dose and rates of excellent images were evaluated.Results The CTA image quality score was 4.72±0.50 and 97.7% (42/43) patients had excellent CTA images. The average effective dose of SAS-CTA was (0.22±0.01) mSv,which was lower by 76.31% than that of DE-CTA.Conclusions Prospective ECG-triggering sequence could be used in cerebral angiography with a significant reduction in radiation dose and diagnostic image quality.