ASIR技术对MSCT增强门脉成像质量的影响

发布时间：2018-07-03 18:09

本文选题：体层摄影术 + X线计算机　；参考：《放射学实践》2017年03期

【摘要】：目的:探讨自适应统计迭代重建(ASIR)技术对成人肝脏CT增强扫描的门静脉成像质量的影响。方法:2015年3月-2015年12月的68例受试者在64排128层螺旋CT上行肝脏CT增强检查。图像重建分别采用FBP和100%ASIR两种方法。由2名高年资影像诊断医师采用双盲法分别对FBP和ASIR重建出的肝脏门静脉期VR图像进行主观评价。分别手工记录肝实质、门静脉的CT值。计算门静脉对比噪声比(CNR)。对于图像质量的主观分析采用非参数Wilcoxon符号秩和检验方法,对于分析所需时间及CNR的比较采用配对t检验方法。结果:对肝脏增强CT门静脉期VR图像的主观评分,FBP为1.81±0.64,ASIR为2.50±0.83(P0.05)。两种方法的门静脉CT值及肝实质CT值间差异没有统计学意义(P0.05)。两种方法背景噪声间差异具有统计学意义(FBP为18.4±2.5,ASIR为6.9±2.3,P0.05)。ASIR重建的图像的CNR高于FBP重建的图像(分别为5.56±1.91、1.99±0.51)(P0.05)。结论:ASIR技术可以有效提高肝脏增强CT检查门静脉成像的CNR及图像质量。
[Abstract]:Objective: to investigate the effect of adaptive statistical iterative reconstruction (ASIR) on portal vein imaging quality of CT enhanced scanning of adult liver. Methods: from March 2015 to December 2015, 68 subjects were examined by ascending CT in 64 slice 128 slice spiral CT. The two methods of image reconstruction are FBP and 100 and ASIR, respectively. Two senior imaging diagnostics were used to evaluate the VR images of liver portal vein reconstructed by FBP and ASIR respectively by double blind method. Ct values of hepatic parenchyma and portal vein were recorded manually. Portal vein contrast noise ratio (CNR) was calculated. The nonparametric Wilcoxon symbolic rank sum test is used for subjective analysis of image quality, and the paired t test method is used for the comparison of analysis time and CNR. Results: the subjective score of VR in portal phase of hepatic enhanced CT was 1.81 卤0.64 and ASIR was 2.50 卤0.83 (P0.05). There was no significant difference in portal CT value and hepatic parenchyma CT value between the two methods (P0.05). The difference of background noise between the two methods was statistically significant (FBP 18.4 卤2.5A ASIR 6.9 卤2.3p0.05). The CNR of ASIR reconstructed images was higher than that of FBP reconstruction images (5.56 卤1.91 卤1.99 卤0.51) (P0.05). Conclusion% ASIR technique can effectively improve CNR and image quality of hepatic enhanced CT in portal vein imaging.
【作者单位】：湖北省江陵县人民医院放射科;武汉大学人民医院放射科;
【分类号】：R816.5

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