迭代重建和滤波反投影重建在脑实质血肿低辐射剂量CT复查中的应用  

Application of iterative reconstruction in comparison with filtered back projection in low-dose CT re-scanning of intracerebral hematoma

作　　者：徐延峰 康立清[1] 于淑靖[1] 张力[1] 车延旭[1] 陈跃峰[1] Yan-feng Xu;Li-qing Kang;Shu-jing Yu;Li Zhang;Yan-xu Che;Yue-feng Chen(Department of CT Diagnosis,Cangzhou Central Hospital,Cangzhou,Hebei 061001,China)

机构地区：[1]河北省沧州市中心医院CT诊断科,河北沧州061001

出　　处：《中国现代医学杂志》2018年第12期118-122,共5页China Journal of Modern Medicine

摘　　要：目的比较迭代重建(IR)滤波反投影重建(FBP)在脑实质血肿低辐射剂量CT复查中的应用优劣。方法选取病程1周内的脑实质血肿头部CT复查的成人90例,随机分为3组,每组各30例。分别进行100、150、200 mAs 3种不同辐射剂量水平的CT扫描。图像分别进行IR和FBP,比较不同剂量组的两种重建方式下脑实质血肿所在层面图像的噪声水平,并对图像质量进行主观评分。结果 (1)相同辐射剂量的图像噪声IR组低于FBP组(P<0.05);(2)IR图像100 mAs组与200 mAs组主观评分差异无统计学意义(P>0.05),100 mAs组噪声高于200 mAs组(P<0.05);(3)FBP 100 mAs组图像质量低于200 mAs组,主观评分和噪声差异有统计学意义(P<0.05);(4)FBP图像150 mAs组与200 mAs组主观评分差异无统计学意义(P>0.05),150 mAs组噪声高于200 mAs组(P<0.05)。结论相同辐射剂量IR较FBP图像噪声更小,图像主观评分相同时IR较FBP所需的辐射剂量更低。对成人脑实质血肿病变的CT复查患者,IR较FBP具有更低辐射剂量的优势,IR可采用100 mAs,而FBP需采用150 mAs。Objective To assess the feasibility and advantage of iterative reconstruction(IR)in low-dose CT(LDCT)scanning of cerebral hemorrhage.Methods Totally 90 adult patients with cerebral hemorrhage in a week who needed CT re-scanning were chosen at random for a study of IR in LDCT.They were divided into three groups respectively with radiation dose levels of 100 mAs,150 mAs and 200 mAs for head CT scanning.Then,IR and filter back projection(FBP)reconstructionwere used.Paired sample t test was applied to evaluate the difference in the image quality between different reconstruction modes in different dose groups.Results For review cases with cerebral hemorrhage:there were statistically significant differences in image noise level between the two reconstructed groups in each dose group(P<0.05);between 100 mAs dose and 200 mAs dose groups of IR,there were no significant differences in image quality score(P>0.05),but there was significant difference in image noise level(P<0.05);between 100 mAs dose and 200 mAs dose groups of FBP,there were significant differences in image quality score and image noise level(P<0.05);between 150 mAs dose and 200 mAs dose groups of FBP,there was no significant difference in image quality score(P>0.05),but there was significant difference in image noise level(P<0.05).Conclusions IR algorithm can achieve lower image noise level than FBP in the same dose manner of head CT scanning;IR has lower radiation dose than FBP with the same image subjective score.IR has the advantage of lower radiation dose than FBP(100 mAs versus 150 mAs)on head CT re-scanning of patients with cerebral hemorrhage.

关 键 词：迭代重建 滤波反投影重建 辐射剂量 脑血肿 

分 类 号：R816[医药卫生—放射医学]