不同级别迭代重建技术在颅脑CT扫描中的应用  

Application of different level iterative reconstruction in CT examination of brain

作　　者：李泉[1] 张莉[2] 卞佳[1] 唐晓[3] 殷志杰[1] 

机构地区：[1]滨州医学院附属医院影像科,滨州256603 [2]滨州医学院附属医院麻醉科 [3]滨州医学院附属医院肿瘤科

出　　处：《滨州医学院学报》2015年第1期43-46,共4页Journal of Binzhou Medical University

基　　金：滨州医学院科技计划(BY2011KJ055)

摘　　要：目的评价颅脑CT扫描中不同级别的迭代重建技术(SAFIRE)对图像质量和噪声的影响,探讨获得最佳图像质量的迭代重建级别。方法收集40例于本院行颅脑CT检查患者,分别采用滤波反投影法(FBP)及1-5级SAFIRE进行图像重建,比较不同组别图像基底节层面的组织CT值、噪声、信噪比、灰质可见度及图像对比度噪声比(CNR),并进行统计学分析。由两名影像学诊断医师采用双盲法以5分法对图像质量进行主观评价。结果 1SAFIRE 2级及3级图像评分值的差异无统计学意义,且二者图像评分最优,高于FBP图像。2SAFIRE 1-5级图像的噪声、信噪比及对比度噪声比均优于FBP图像,而灰质对比度差异均无统计学意义。结论在常规颅脑CT扫描中,与常规重建算法FBP比较,SAFIRE重建技术可提高图像质量,降低图像噪声。Objective To evaluate the image quality and noise using different levels of iterative reconstruction technique （SAFIRE）on brain CT scan ,and to explore the best level iterative reconstruction which can provide the best image quality . Methods Siemens Somatom Definition Flash CT was used to perform brain CT examination on 40 patients .The original data of every case were reconstructed using traditional filtered back projection （FBP） and five different levels of iterative reconstruction techniques （SAFIRE1‐5）respectively .The image CT values ,noise ,GM visibility and contrast to noise ratio（CNR） of different levels of reconstruction images were analyzed statistically .The image quality was reviewed by two experienced doctors double-blindly using 5‐score system .Results ① There was no significant difference between SAFIRE2 and SAFIRE3 scores and the image quality were best .②The noise ,SNR and CNR .values of SAFIRE1-SAFIRE5 images were all better than those of FBP . While there was no significant difference in gray matter contrast .Conclusion On brain CT examination ,compared with FBP , the application of iterative reconstruction techniquecan significandy improve image quality and reduce image noise .

关 键 词：体层摄影术 X线计算机 辐射剂量 

分 类 号：R814.42[医药卫生—影像医学与核医学]