混合迭代重建算法对肺CT量化分析结果的影响

发布时间：2018-03-03 04:12

本文选题：迭代重建　切入点：体层摄影术　出处：《临床放射学杂志》2017年04期 　论文类型：期刊论文

【摘要】：目的评价混合迭代重建算法混合权重对肺CT量化分析结果的影响,包括图像噪声、肺实质及气道量化指标、肺结节体积等。方法 52例肺CT扫描原始数据分别利用滤波反投影(FBP)、ASIR-V30%、ASIR-V50%、ASIR-V70%、ASIR-V100%算法重建。测量肺气肿指数、全肺容积、右肺上叶尖段支气管气道腔面积、气道壁面积、气道壁面积百分比、气道壁平均厚度、气道平均直径、气管分叉层面气道内空气及降主动脉血液CT平均值、标准差。测量54枚肺结节实性及非实性体积。比较不同迭代混合权重对上述测量结果的影响。结果随着ASIR-V比例的提高(FBP,ASIR-V30%,ASIR-V50%,ASIR-V70%,ASIR-V100%),肺气肿指数逐渐降低(分别为3.34%、2.13%、1.46%、0.98%、0.57%),图像噪声逐渐降低(空气CT值标准差:29.8 HU,25.5 HU,22.6 HU,19.6 HU,15.2 HU;降主动脉CT值标准差:35.2 HU,27.6 HU,22.7 HU,18.0 HU,12.1 HU)(P0.01),其他量化结果影响无统计学意义。结论混合迭代重建混合权重影响肺CT图像噪声水平及肺气肿指数,对肺实质、气道指标、肺结节体积影响无统计学意义。
[Abstract]:Objective to evaluate the effect of mixed weight of mixed iterative reconstruction algorithm on lung CT quantitative analysis, including image noise, lung parenchyma and airway quantification. Methods the original data of 52 cases of lung CT scanning were reconstructed by the ASIR-V30, ASIR-V50 and ASIR-V70, respectively. The emphysema index, the whole lung volume, the airway area of the upper apical segment of the right lung, the area of the airway wall, the area of the bronchial wall of the upper lobe of the right lung were measured. Percentage of airway wall area, mean thickness of airway wall, mean diameter of airway, CT mean value of airway air and descending aorta blood at trachea bifurcation level. Standard deviation. 54 lung nodules solid and non-solid volumes were measured. The effects of different iterative mixing weights on the above results were compared. Results with the increase of ASIR-V ratio, ASIR-V50 and ASIR-V100, emphysema index gradually decreased (3.342.131.131.460.98) and 0.57%, image noise. The standard deviation of CT value of descending aorta was: 29.8 HU25.5 HU22.6 HU19.6 HU15.2 HU15.2; the standard deviation of descending aorta CT value was 35.2 HU27.6 HU27.6 HU27.6 HU12.1 HU12.1 HUP 0.01, other quantitative results had no statistical significance. Conclusion mixed iterative reconstruction mixing weight has influence on lung CT image noise level and pulmonary emphysema index. There was no significant difference in pulmonary parenchyma, airway index and pulmonary nodule volume.
【作者单位】：北京大学人民医院放射科;
【分类号】：R816.41

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