Bai Aiguo, Sun Yibo, Qi Lin, Yang Yanli, Hua Yanqing
From the Department of Radiology, Hua Dong Hospital of Fu Dan University, Shanghai, China.
J Comput Assist Tomogr. 2013 Sep-Oct;37(5):718-24. doi: 10.1097/RCT.0b013e3182a022be.
The objectives of this study were to assess quantitative and subjective image quality in computed tomographic pulmonary angiography using dual-energy subtraction methods compared with those of the monochromatic images using optimal contrast-to-noise ratios and those of the routine polychromatic images and to select the best dual-energy subtraction method.
A total of 1 routine polychromatic image, 3 sets of dual-energy subtraction images (DESIs), and 2 sets of monochromatic images with different optimal contrast-to-noise ratios from 30 patients were obtained. The signal intensity and noise were measured; signal-to-noise ratio and contrast-to-noise ratio (CNR) were calculated. The global subjective image quality was subjectively assessed.
The DESI 3 got the highest CNR and the DESI 1 got the second highest CNR. The DESI 1 got the highest global subjective image quality score. The 3 subtraction image sets got the highest score in visualization of the pulmonary artery branches.
Computed tomographic pulmonary angiography with dual-energy subtraction technique is feasible. The DESI 1 afforded the best balance between the quantitative analysis and the subjective evaluation.
本研究的目的是使用双能量减影方法评估计算机断层扫描肺动脉造影中的定量和主观图像质量，并与使用最佳对比噪声比的单色图像以及常规多色图像的质量进行比较，同时选择最佳的双能量减影方法。
从30例患者中获取了1幅常规多色图像、3组双能量减影图像（DESIs）以及2组具有不同最佳对比噪声比的单色图像。测量了信号强度和噪声；计算了信噪比和对比噪声比（CNR）。对整体主观图像质量进行了主观评估。
DESI 3获得了最高的CNR，DESI 1获得了第二高的CNR。DESI 1获得了最高的整体主观图像质量评分。这3组减影图像在肺动脉分支可视化方面得分最高。
双能量减影技术的计算机断层扫描肺动脉造影是可行的。DESI 1在定量分析和主观评估之间提供了最佳平衡。
