能谱CT单能量成像联合自适应迭代算法重组技术在肠系膜上动静脉图像质量的临床研究  

Images Analysis of Superior Mesenteric Artery and Vein Based on Spectral CT Optimal Monochromatic Imaging Combined with Adaptive Statistical Iterative Reconstruction

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] 

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6期889-894,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(编号:2015Q001)

摘　　要：目的探讨应用能谱CT最佳单能量成像联合40%自适应统计迭代重组(ASIR)技术对肠系膜上动脉及静脉图像质量的优化。方法搜集临床腹部能谱CT检查的25例腹部疾病患者资料,应用能谱分析软件,得出能谱CT成像中最佳单能图像,分别采用70 ke V、最佳单能量、最佳单能量+40%ASIR模式进行肠系膜上动脉、肠系膜上静脉重组,比较70 ke V、最佳单能量、最佳单能量+40%ASIR 3组肠系膜上动静脉的CT值、背景噪声(SDn)及背景CT值、对比噪声比(CNR)、信噪比(SNR)及主观图像质量评分,并采用两因素方差分析进行比较。结果肠系膜上动脉及静脉最佳CNR单能量水平集中在55~62 ke V左右,平均为60 ke V。最佳单能量组(60 ke V)、70 ke V单能量组、最佳单能量(60 ke V)+40%ASIR组肠系膜上动脉的CNR分别20.41±7.66,17.16±6.79,22.85±8.24;图像质量评分分别为4.24±0.35、3.86±0.19和4.25±0.36。肠系膜上静脉CNR分别为5.80±1.99、4.37±1.22和7.27±2.51;图像质量评分分别为3.78±0.35、3.46±0.27和3.81±0.32,差异均有统计学意义(P<0.05)。60 ke V+40%ASIR组CNR、SNR均高于70 ke V组及60 ke V组;60 ke V+40%ASIR组主观评分高于70 ke V组(P<0.05),与60 ke V组无统计学差别(P>0.05)。结论能谱肠系膜上动脉及静脉成像中最佳单能量(60ke V)+40%ASIR图像较70 ke V及60 ke V图像成像质量有所提高,可以在临床血管成像方面广泛应用。Objective To investigate the improvement effect of the optimal monochromatic parameters combined with adaptive statistical iterative reconstruction（ ASIR） on the image quality of superior mesenteric artery（ SMA） and superior mesenteric vein（ SMV） using energy spectral CT. Methods 25 patients with abdominal disease using the GSI technique were analyzed retrospectively. The optimal monochromatic set was selected for obtaining the best contrast to noise ratio（ CNR） for SMA and SMV. The monochromatic images of SMA and SMV were reconstructed by 70 ke V,optimal monochromatic and optimal monochromatic ＋ 40% ASIR mode,respectively. Comparative parameters including CT value,backgnud noises（ SDn）,backgroud CT value（ CTB）,contrast-to-noise ratio（ CNR）,signal-to-noise ratio（ SNR） and subjective scores of the SMA and SMV. Two-way ANOVA was used for statistical analysis. Results The optimal monochromatic images of the SMA and SMV were about 60 ke V（ ranged from 55 ke V to 62 ke V）. CNR of the optimal monochromatic group（ 60 ke V）,the 70 ke V group,and the optimal monochromatic（ 60 ke V） ＋ 40% ASIR group of SMA were20. 41 ± 7. 66,17. 16 ±6. 79,22. 85 ± 8. 24,respectively,Subjective scores were 4. 24 ± 0. 35,3. 86 ± 0. 19 and 4. 25 ± 0. 36,respectively. CNR in SMV were 5. 80 ± 1. 99,4. 37 ± 1. 22 and 7. 27 ± 2. 51,respectively,Subjective scores were 3. 78 ± 0. 35,3. 46 ± 0. 27 and3. 81 ± 0. 32,respectively. CNR and subjective scores had significant difference among the groups（ P〈0. 05）. CNR and SNR of SMA and SMV in 60 ke V ＋ 40% ASIR group were superior to those in the 70 ke V and 60 ke Vgroup. Subjective scores of SMA and SMV in 60 ke V ＋ 40% ASIR group were superior to those in the 70 ke V group（ P〈0. 05）,had no significant difference with 60 ke V group. Conclusion Cmpared with 70 ke V and 60 ke V imaging,the optimal monochromatic（ 60 ke V） ＋ 40% ASIR imaging could significantly improve the image quality of SMA and SMV and be widely used in clin

关 键 词：肠系膜上动脉 肠系膜上静脉 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]