基于迭代重建的 SAFIRE 技术在肝脏 CT 扫描中的应用价值  

The application value of iterative reconstruction SAFIRE technique in liver CT

作　　者：曾宪春[1,2] 王玉权[1] 韩丹[2] 王谦[1] 康绍磊 

机构地区：[1]贵州省人民医院放射科,贵州贵阳550002 [2]昆明医科大学第一附属医院医学影像科

出　　处：《实用放射学杂志》2014年第8期1376-1379,共4页Journal of Practical Radiology

基　　金：昆明医科大学研究生创新基金（2012S02）.

摘　　要：目的：对比 DSCT 肝脏平扫后 SAFIRE 重建与传统 FBP 重建图像,探讨 SAFIRE 重建技术在肝脏 CT 平扫中的价值。方法对临床疑肝脏病变患者48例,行 DSCT 肝脏扫描后,比较 FBP 和 SAFIRE 1~5共6组重建图像的平均 CT 值、噪声、信号噪声比（SNR）、对比噪声比（CNR）及图像质量的主观评分等。结果6组图像相比,肝实质平均 CT 值无统计学差异（P 〉0.05）；噪声、SNR、CNR 及主观评分间均有统计学差异（P 〈0.05）,SAFIRE 5重建噪声最小,SNR、CNR 最大。图像主观评分 SAFIRE 1和SAFIRE 5图像评分低于 FBP,SAFIRE 2~4高于 FBP,SAFIRE 3评分最高,但6种重建图像的病变检出率一致。结论 SAFIRE重建能降噪及提高 SNR、CNR,以 SAFIRE 3重建图像质量最佳,具有潜在降低扫描辐射剂量的作用。Objective To study the value of SAFIRE reconstruction technique in the liver plain CT scan by the comparison of displays to the liver separately by SAFIRE and traditional FBP reconstructions after DSCT scan.Methods 48 patients clinically doub-ted to have hepatic lesions were scanned by DSCT in liver,then the average CT value,noise,signal to noise ratio （SNR）,contrast to noise ratio （CNR）and subjective scoring on image quality were compared after FBP and SAFIRE 1-5 reconstructions.Results There was no statistical difference on the average CT value of liver parenchyma in all 6 groups （P 〉0.05）.The differences were statistically significant （P 〈0.05）on noise,SNR,CNR and subjective scoring.SAFIRE 5 reconstruction had the least noise and the largest SNR and CNR.For the images of SAFIRE 1 and SAFIRE 5,the image subjective scoring was lower than that by FBP;for the images of SAFIRE 2-4,the image subjective scoring is higher than that by FBP;and SAFIRE 3 had the highest score.But for the rate of lesion detection,all the images were the same.Conclusion SAFIRE reconstruction strength 3 could produce the idealest image quality.SAFIRE reconstruction can decrease noise and improve SNR and CNR,and have a potential effect on decreasing the scan dose.

关 键 词：SAFIRE 重建技术 噪声 肝脏扫描 

分 类 号：R814.49[医药卫生—影像医学与核医学] R322.47[医药卫生—放射医学]