最佳ASIR联合能谱单能量成像对腹部增强及血管图像质量的优化研究  

Optimal Adaptive Statistical Iterative Reconstruction Percentage in Monochromatic Level with Spectral CT Imaging for Improving Imaging Quality of Abdomen and Abdominal Vessels

作　　者：殷小平[1] 左紫薇 徐英进[1] 王佳宁[1] 刘怀军[2] 梁广路[1] YIN Xiaoping ZUO Ziwei XU Yingjin et al(CT/MRI Room, Affiliated Hospital of Hebei University, Baoding, Hebei Province 071000, P. R. China)

机构地区：[1]河北大学附属医院CT/MRI诊断室,保定071000 [2]河北医科大学第二医院医学影像科,石家庄051000

出　　处：《临床放射学杂志》2017年第2期283-288,共6页Journal of Clinical Radiology

基　　金：2015年河北省科技计划项目(编号:15277740D);2014年河北省医学科学研究重点课题项目(编号:ZD20140443);2015年河北省政府资助临床医学优秀人才培养项目(编号:361007);河北大学附属医院青年基金项目(编号:2015Q001)

摘　　要：目的探讨最佳自适应统计迭代重建(ASIR)百分比联合最优单能量技术提高腹部图像质量,优化腹部血管显示。方法搜集临床腹部能谱CT检查的32例腹部疾病患者资料,应用能谱分析软件,采用70 ke V、55ke V分别联合0%、30%、50%、70%ASIR模式进行腹部动脉期及门静脉期重建,比较70 ke V联合不同ASIR百分比模式下动脉期及门静脉期肝实质噪声(LN)、胰腺噪声(PN),竖脊肌噪声(SMN)以及肝CNR(LCNR)、胰腺CNR(PCNR)、门静脉CNR(PV-CNR)及主观图像质量评分之间差异有无统计学意义。同时比较55 ke V联合不同ASIR百分比模式下动脉期及门静脉期腹部动脉血管、门静脉CNR等相关指标及主观图像质量评分,并采用单因素方差分析进行比较。结果 70 ke V组不同ASIR比例中,LN、PN,SMN、LCNR及PCNR差异均有统计学意义(P<0.05)。主观图像质量评分显示动脉期及静脉期不同ASIR组间比较,30%组伪影最低;诊断信心度方面30%最高;噪声方面70%最低,微小结构及病变显示方面各ASIR组间无统计学差异。55 ke V组间,除了动脉期LCNR各组间差异无统计学意义,腹部各动脉血管CNR及PV-CNR,LN,SMN,PN,主观评分及门静脉期LCNR在不同ASIR组间差异均有统计学意义(P<0.05);主观评分方面以50%ASIR组最优(P<0.05)。结论 70 ke V+30%ASIR及55ke V+50%ASIR分别成为优化腹部图像质量及血管成像的最优化组合。Objective The aim of this article was to investigate the optimal adaptive statistical iterative reconstruction percentage in monochromatic level with spectral CT imaging for improving imaging quality of abdomen and abdominal vessels. Methods The clinical and medical imaging data of 32 patients with abdominal disease who were examined using the GSI technique were analyzed retrospectively. Monochromatic images at 70 ke V and 55 ke V were reconstructed in abdominal arterial and portal phase with four ASIR percentages： 0%,30%,50%,70%. Comparative parameters included liver noise（ LN）,Pancreatic noise（ PN） and sacrospinal muscle noise（ SMN）,the CNR of liver,pancreas and portal vein and subjective scores in the 70 ke V group. Whereas comparative parameters included the CNR of Celiac artery,superior mesenteric artery,renal artery and portal vein. liver noise,Pancreatic noise and sacrospinal muscle noise,the CNR of liver,pancreas and subjective scores in the 55 ke V group. One-way ANOVA was used to for statistical analysis. Results LN,PN,SMN of different ASIR were statistically different（ P 〈 0. 05） in abdominal arterial and portal phase of the 70 ke V group. The noise,artifact and diagnostic confidence in subjective scores were statistically different（ P 〈 0. 05） in the arterial and portal phase.The least artifact is obtained in 30% ASIR and the highest diagnostic confidence is achieved in 30% ASIR. The lowest noise is obtained in 70% ASIR. Visibilties of small structures and lesion detection were not statistically different（ P 〉 0. 05） in different ASIR. Meanwhile in 55 ke V group,The CNR of abdominal arteries,PV-CNR,LN,SMN,PN,Score in abdominal arterial and portal phase and LCNR in portal phase of different ASIR were statistically different（ P 〈 0. 05）,and LCNR in arterial phase of different ASIR was not statistically different（ P 〉 0. 05）. The subjective score was the best in the 50%ASIR group and was better than 0% ASIR,30% ASIR and 70% ASIR（ P 〈 0. 05）. Conclusion 70

关 键 词：能谱CT CT血管成像 单能量成像 自适应迭代算法重建 

分 类 号：R816.5[医药卫生—放射医学]