能谱CT不同KeV对男性肺气肿患者定量测定的影响分析

发布时间：2018-02-11 22:04

本文关键词： 能谱CT KeV 肺气肿层厚体积 CT值 EI指数　出处：《山西医科大学》2017年硕士论文　论文类型：学位论文

【摘要】：目的:能谱CT扫描方式下,利用GSI(gemstone spectral imaging)浏览器及Shaded Surface Lung软件研究不同层厚及KeV对男性肺气肿患者总体积、平均CT值、EI指数等测量时的影响。方法:对确诊的40例男性肺气肿患者行能谱扫描。利用GSI view软件从50-80KeV每隔5KeV创建一组数据,共7组;对5mm(厚层)的单能数据进行0.625mm(薄层)重建,并用Shaded Surface Lung软件进行测量,测量其双肺总体积,平均密度,EI指数。评价不同KeV,不同重建层厚下全肺总体积,平均密度,EI指数,是否有显著差异。并对测量值采用合适的统计学处理。统计学软件为SPSS22.0,以P0.05认为有差异,具有统计学意义。结果:1.不同KeV下肺气肿总体积、平均CT值无显著差异(单位:体积ml,CT值Hu,体积P=0.6550.05;平均CT值P=0.9980.05)。但是大于60KeV时总体积测量更稳定。50-80KeV各组总体积为4329.9±993.9,4507.0±1057.8,4719.8±1170.2,4776.4±1206.4,4780.1±1207.6,4780.1±1207.6,4779.9±1200.8,4766.6±1185.0,4665.7±1143.4;50-80KeV各组平均CT值为-855.4±31.2,-855.9±32.9,-852.4±36.7,-850.8±38.2,-852.1±38.0,-853.2±38.0,-854.2±37.8。2.不同KeV下EI指数有差异(P0.05)。低KeV测量EI指数会产生较大误差,大于60KeV时测量稳定。50-80KeV各组EI-950指数为0.205±0.096,0.180±0.095,0.133±0.096,0.093±0.0172,0.113±0.095,0.118±0.096,0.124±0.098。3.薄层与厚层CT对体积测量无显著差异(P=0.9460.05)。薄层总体积均值为4495.0±1309.0,厚层总体积均值为4515.5±1361.2。4.薄层与厚层CT对平均CT值及EI指数测量有差异(CT值P=0.0230.05;EI指数P=0.030.05)。厚层CT较薄层CT升高20Hu左右。薄层平均CT值为-841.2±36.9,厚层平均CT值为-821.2±39.1。薄层EI-910指数为0.227±0.155,厚层EI-910指数为0.136±0.128。结论:不同KeV及层厚对男性肺气肿定量测定有影响。
[Abstract]:Objective: to study the effect of different slice thickness and KeV on the total volume of emphysema in male patients with emphysema by using GSI(gemstone spectral imaging browser and Shaded Surface Lung software. Methods: 40 cases of male emphysema were scanned by energy dispersive spectrum. A set of data was created from 50-80 KeV every 5 KeV by GSI view software. The single energy data of 5 mm (thick layer) were reconstructed with 0.625 mm (thin layer), and measured by Shaded Surface Lung software. The total volume and mean density of the lung were measured, and the total lung volume, mean density and ei index were evaluated under different Kev and different thickness of the reconstructed layer. The statistical software is SPSS 22.0, the statistical software is SPSS 22.0. the statistical software is SPSS 22.0. the statistical software is SPSS 22.0. the statistical software is SPSS 22.0. the statistical software SPSS 22.0 is considered to be different, which has statistical significance. Results: 1. The total volume of emphysema under different KeV, There was no significant difference in the mean CT value (unit: volume volume CT value Hu, volume P0.6550.05; average CT value: Pu 0.9980.055.However, the mean CT value of each group was 4329.9 卤993.9 卤993.9V 4507.0 卤1057.847.8 卤1170.24776.4 卤1207.64780.1 卤1207.64780.1 卤1207.64779.9 卤1207.64779.9 卤1207.64779.9 卤1207.64779.9 卤1207.64779.9 卤1207.64779.9 卤1285.04665.7 卤1185.04665.7 卤1143.44.50KeV = -855.4 卤31.2n -855.9 卤32.9ke-8536.77-858.0.8 卤38.38.28.32 卤38.88.32 卤38.88.88.88.32 卤38.88.84.2keV. there was a significant difference in the average value of CT between groups. The error of ei index is great. The EI-950 index of stable. 50-80 KeV groups was 0. 205 卤0. 096 卤0. 180 卤0. 095 卤0. 133 卤0. 096 0. 093 卤0. 0172 0. 113 卤0. 096 0. 118 卤0. 096 0. 124 卤0. 098. 3. There was no significant difference between thin layer CT and thick slice CT in volume measurement (P0. 946. 05). The average CT value of thin slice CT was -841.2 卤36.9, the average CT value of thick slice was -821.2 卤39.1, the EI-910 index of thin layer was 0.227 卤0.155, and the index of thick slice EI-910 was 0.136 卤0.128.Conclusion: different KeV and slice thickness have influence on the quantitative measurement of emphysema in male.
【学位授予单位】：山西医科大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R563.3;R816.41

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