能谱 CT 最佳单能量图像对提高手部肌腱图像质量的研究  

The study of dual energy spectral CT on the image quality of hand tendons

作　　者：邓凯[1] 王文文[2] 李伟[1] 王君君[3] 王广丽[1] 张成琪[1] 

机构地区：[1]山东大学附属千佛山医院,山东济南250014 [2]山东省医学影像学研究所 [3]济南市妇幼保健院

出　　处：《实用放射学杂志》2014年第6期1007-1009,共3页Journal of Practical Radiology

基　　金：山东省自然科学基金（ZR2009CL013）.

摘　　要：目的：评价能谱 CT 手部肌腱最佳单能量图像质量,与常规 CT 图像比较。方法对40例患者行能谱 CT 扫描,根据能谱曲线,选择65 keV 作为手部肌腱成像的最佳单能量。采用主观法和客观法2种方法分别对65 keV 单能量图像与常规混合能量图像质量进行对比分析。结果主观法中,65 keV 单能量图像质量得分高于常规混合能量图像,两者之间具有统计学差异（P 〈0.05）。客观法中,65 keV 单能量图像能够明显降低线束硬化伪影,提高图像质量（P 〈0.05）。2种方法中不同观察者之间的一致性较好（Kappa=0.75,Kappa=0.85）。结论与常规 CT 相比,65 keV 单能量图像能够明显减少线束硬化伪影,提高手部肌腱图像质量。Objective To evaluate the image quality of hand tendons by using spectral CT,compared with conventional CT images.Methods Forty patients scanned with spectral CT were enrolled.The 65keV of optimal contrast-to-noise ratio （Optimal CNR） for viewing hand tendons was selected.The image quality of monochromatic GSI images （65 keV）and conventional CT images were compared with two different methods including subjective method and objective method by two radiologists respectively.Results In subjective method,the image quality in GSI images was superior to conventional CT images （P 〈0.05）.And in objective method, the beam-hardening artifacts in the phalanges of fingers space were reduced markedly with hand tendons displaying more clearly in GSI images （P 〈0.05 ）.There was no significant difference between the two radiologists in both methods with good correlation （Kappa=0.75,Kappa=0.85）.Conclusion Spectral CT with the optimal 65keV monochromatic images could reduce the artifacts and increase image quality significantly in hand tendons imaging.It might be a very useful supplementary imaging method in detecting tendon diseases in routine work.

关 键 词：能谱CT 图像质量 线束硬化伪影 肌腱 

分 类 号：R814.42[医药卫生—影像医学与核医学] R322.7[医药卫生—放射医学]