基于原始数据的迭代重建在头颈部动脉CT血管造影中的应用研究  

Application of sinogram affirmed iterative reconstruction(SAFIRE) in head and neck CT angiography

作　　者：张伟华[1] 李卫侠[1] 吴梦雄[1] 常蕊[1] 董海鹏[1] 

机构地区：[1]上海交通大学医学院附属瑞金医院放射科,上海200025

出　　处：《诊断学理论与实践》2015年第3期244-247,共4页Journal of Diagnostics Concepts & Practice

摘　　要：目的 ：探讨基于原始数据的迭代重建（sinogram affirmed iterative reconstruction,SAFIRE）技术在头颈部动脉CT血管造影（CT angiography,CTA）中的应用。方法：将90例患者随机分为全剂量组（130 k V/140 m As;CTDIvol=15.39 m Gy组,46例）和半剂量组（110 k V/104 m As;CTDIvol=7.7 m Gy组,44例）,进行头颈部动脉CTA检查。对全剂量组数据采用滤波反投影（filtered back projection,FBP）重建,对半剂量组数据分别采用FBP及SAFIRE重建,并分别计算2组数据的主动脉弓根部、颈总动脉分叉处、基底动脉起始处、大脑中动脉的CT值、噪声、信噪比（signal to noise ratio,SNR）、对比噪声比（contrast to noise ratio,CNR）。结果 ：在半剂量组中,主动脉弓根部、颈总动脉分叉处、基底动脉起始处及大脑中动脉的SAFIRE 1~3级重建与FBP重建方法相比,SAFIRE 3级的图像噪声最低,SNR和CNR显著提高,组间数据差异有统计学意义（P〈0.05）。半剂量组SAFIRE 3级重建与全剂量组FBP重建相比,半剂量组SAFIRE 3级重建的图像噪声显著降低,SNR和CNR显著提高,2组数据间差异有统计学意义（P〈0.05）。结论 ：与FBP相比,SAFIRE在辐射剂量较低的条件下仍能获得高质量的图像。Objective To study the performance of sinogram affirmed iterative reconstruction（SAFIRE） in head and neck CT angiograph（CTA）. Methods： Ninety subjects undergone CT angiography scan of head and neck were prospective-ly randomly divided into two groups： 46 subjects for full-dose group（FD, 130 k V/140 m As; CTDIvol=15.39 m Gy） and 44 subjects for half-dose group（HD, 110 k V/104 m As; CTDIvol=7.7 m Gy）. The data of FD group were reconstructed by filtered back projection（FBP）, and the data of HD group were reconstructed both by FBP and SAFIRE with strength one to three（SAFIRE 1-3）. The CT value, noise, signal to noise ratios（SNR） and contrast to noise ratio（CNR） of aortic arch,carotid artery bifurcation, basilar artery and middle cerebral artery were measured for both groups. Results： For HD group,SAFIRE 3 significantly decreased image noise and increased SNR and CNR when compared with FBP（ P〈0.05）. Compared with FBP and SAFIRE 1-2, SAFIRE 3 had the lowest image noise in HD group. SAFIRE 3 significantly decreased image noise and increased SNR and CNR in HD group when compared with FBP in FD group（P〈0.05）. Conclusions： Compared with FBP, SAFIRE with low dose could significantly improve image quality for head and neck CTA.

关 键 词：迭代重建 滤波反投影 噪声 信噪比 对比噪声比 

分 类 号：R445.4[医药卫生—影像医学与核医学]