宝石能谱CT不同比例ASIR在改善冠状动脉单能量图像质量中的初步应用

发布时间：2018-05-20 18:50

本文选题：宝石能谱计算机体层摄影 + 冠状动脉成像　；参考：《临床放射学杂志》2015年06期

【摘要】：目的评价不同比例ASIR重建技术在能谱CT冠状动脉单能量图像中的应用价值,以寻求图像质量最佳的ASIR比例。方法共30例接受冠状动脉CT(Discovery CT750 HD)能谱扫描者入组。一次能谱成像获得5组单能量图像(60、65、70、75、80 ke V),同时每一组单能量图像分别进行不同比例ASIR重建(0%,20%,40%,60%,80%和100%),共30组重建图像,对混合能量图像及各组单能量不同比例ASIR图像进行感兴趣区SNR值、CNR值的测定,并且按李克特量表4分法进行图像质量评价。结果与传统混合能量图像相比,能谱成像所得65 ke V单能量图像和100%ASIR比例重建显示的CNR和SNR最大改善,分别是144%,P0.001;173%,P0.001。而主观评价图像质量方面,则显示60~65 ke V与40%~60%ASIR相结合,较传统混合能量图像质量改善50%以上(P0.001)。结论冠状动脉CTA低剂量扫描技术[平均剂量(2.43±0.42)m SV],能谱CT 65~75ke V单能量和ASIR 40%~60%重建方案可以明显降低噪声,改善图像质量。
[Abstract]:Objective to evaluate the application value of different ratio ASIR reconstruction technique in single energy coronary artery image of energy dispersive CT, and to find out the best ASIR ratio of image quality. Methods A total of 30 patients underwent coronary CT(Discovery CT750 energy dispersive scanning. Five groups of single energy images were obtained by a single energy spectrum imaging. Each group of single energy images were reconstructed with different proportions of ASIR, respectively, and 80% and 100%, respectively, of each group of single energy images, and there were 30 groups of reconstructed images. The region of interest (SNR) value and the SNR value of each group of ASIR images with different ratio of single energy and mixed energy were measured, and the image quality was evaluated according to the four score method of the Richter scale. Results compared with the conventional mixed energy images, the maximum improvement of CNR and SNR in 65 Kev single-energy images and 100%ASIR proportional reconstruction was 144keV, P0.001, 173and P0.001, respectively. The subjective evaluation of image quality shows that the combination of 605keV and 40%~60%ASIR can improve the image quality by more than 50% compared with the traditional mixed energy image (P0.001). Conclusion the low dose coronary CTA scanning technique [mean dose of 2.43 卤0.42mSV] can significantly reduce the noise and improve the image quality.
【作者单位】：华中科技大学同济医学院附属协和医院放射科;石河子大学医学院第一附属医院CT、MRI室;石河子大学医学院;GE中国CT影像研究中心;
【分类号】：R543.3;R816.2

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