BACKGROUND Diagnostic quality of computed tomography (CT) images depends on numerous factors. Recently, two different modalities were introduced for coronary CT angiography (CCTA). OBJECTIVE This study aims to compare the performance of 16 cm wide-coverage detector CT (WDCT) using the snapshot freeze technique with a new-generation dual-source CT (DSCT) with 66 ms temporal resolution for CCTA. METHODS Total 101 patients with suspected coronary heart disease were enrolled. Of these, 50 and 51 patients were examined on WDCT and DSCT, respectively. CT values, image noise, signal-to-noise ratio, and contrast-to-noise ratio were measured. The image processing efficiency was recorded, followed by statistical comparison of diagnostic accuracy and radiation dose. RESULTS Ninety-nine patients (98.02%) had satisfactory diagnostic image quality. DSCT was significantly better than WDCT in terms of quantitative image quality, image processing efficiency, and qualitative analysis (P < 0.05). However, radiation dose was significantly lower on WDCT (P < 0.05) as compared to DSCT. CONCLUSIONS Image processing efficiency and image quality of CCTA was higher on DSCT compared to WDCT due to the limitation of maximal tube current of WDCT.

中文翻译：

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与新一代双源 CT 相比，16 cm 宽覆盖计算机断层扫描的定性和定量图像分析。

背景技术计算机断层扫描（CT）图像的诊断质量取决于多种因素。最近，冠状动脉 CT 血管造影 (CCTA) 引入了两种不同的方式。目的 本研究旨在比较使用快照冻结技术的 16 cm 宽覆盖探测器 CT (WDCT) 与 CCTA 时间分辨率为 66 ms 的新一代双源 CT (DSCT) 的性能。方法共纳入疑似冠心病患者101例。其中，分别对 50 和 51 名患者进行了 WDCT 和 DSCT 检查。测量了 CT 值、图像噪声、信噪比和对比度噪声比。记录图像处理效率，然后对诊断准确性和辐射剂量进行统计比较。结果 99 例患者（98.02%）具有满意的诊断图像质量。在定量图像质量、图像处理效率和定性分析方面，DSCT 均显着优于 WDCT（P < 0.05）。然而，与DSCT相比，WDCT的辐射剂量显着降低（P < 0.05）。结论由于WDCT最大管电流的限制，CCTA在DSCT上的图像处理效率和图像质量高于WDCT。