单能量去金属伪影技术在脑动脉瘤术后中的应用价值  

The application value of single energy metal artifact reduction technique in the follow-up of postoperative patients with intracranial aneurysms

作　　者：冉彦永 潘宇宁[2] 陈兆乾[2] 黄求理[2] RAN Yan--yong;PAN Yu-nin;CHEN Zhao-qian;HUANG Qiu-li(Department of Radiology,Fenghua Aiyimei Hospital,Ningbo Zhejiang 315500,China,Department of Radiology,Ningbo First Hospital,Ningbo Zhejiang 315010,China)

机构地区：[1]宁波爱伊美医院放射科,浙江宁波315500 [2]宁波市第一医院影像科,浙江宁波315010

出　　处：《中国临床医学影像杂志》2018年第12期852-856,共5页Journal of China Clinic Medical Imaging

基　　金：浙江省医药卫生科研项目(2018KY155);宁波市科技局科技惠民项目(2016C51013);宁波市自然科学基金项目(2016A610140);宁波市医疗卫生品牌学科项目(PPXK2018-04)

摘　　要：目的:评价单能量去金属伪影技术(SEMAR)对颅内动脉瘤栓塞及夹闭术后金属伪影和灌注参数的影响。方法:55例颅内动脉瘤栓塞或夹闭术后患者,均行320排CTA+灌注一站式检查。扫描后首先用第三代适应性迭代降噪算法(AIDR 3D)单独重建成No-SEMAR组,再用SEMAR加AIDR 3D算法重建成SEMAR组。分别对比两组金属伪影周围的噪声、对比噪声比(CNR)、伪影指数(AI)、伪影的最大直径、图像质量主观评分和灌注参数。结果:与No-SEMAR组相比,SEMAR组噪声、伪影最大直径、AI明显减低(P<0.01),图像质量主观评分和CNR明显增高(P<0.01)。两组得到的灌注参数脑血流量(CBF)、脑血容量(CBV)、平均通过时间(MTT)线性相关性良好(P<0.01)。结论:SEMAR技术可以明显减少颅内动脉瘤金属植入物的伪影,能在不影响脑CT灌注参数的情况下,提高图像质量。Objective:To evaluate the effect of a single-energy metal artifact reduction (SEMAR)technique for metallic implantation materials artifacts reduction and perfusion parameters in brain imaging.Methods:Computed tomography angiography(CTA)and CT perfusion were performed on 55 patients with implanted metallic materials in the brain.All CT examinations were performed on a 320-row CT scanner.No-SEMAR images were reconstructed with iterative reconstruction alone,and SEMAR images were reconstructed with iterative reconstruction plus the SEMAR algorithm.Noise (N-measured on the image with the most pronounced artifact),contrast-to-noise ratio (CNR),artifact index (AI),maximum diameter of artifact,image quality score,and cerebral perfusion parameters were compared between the two groups.Two radiologists visually evaluated the metallic artifacts using a four-point scale and a double blind method.Results:Compared with No-SEMAR images,noise,artifact diameter,and artifact index were reduced significantly after images were reconstructed using the SEMAR algorithm (P<0.01). The subjective image quality score and contrast-to-noise ratio increased significantly (P<0.01).The perfusion parameters(blood flow,blood volume,and mean transit time)obtained between the No-SEMAR and SEMAR groups exhibited linear correlation (P<0.01).Conclusion:The SEMAR algorithm significantly reduces artifact from implanted metallic materials in the brain and can potentially increase CT image quality without influencing cerebral blood perfusion parameters.

关 键 词：颅内动脉瘤 体层摄影术 X线计算机 

分 类 号：R739.41[医药卫生—肿瘤] R814.42[医药卫生—临床医学]