生理通气辅助超高分辨率CT扫描技术探讨

发布时间：2018-04-16 20:38

本文选题：生理通气 + 矩阵　；参考：《中国医学计算机成像杂志》2015年03期

【摘要】：目的:探讨生理通气辅助超高分辨率CT扫描技术(简称G-方案),提高对肺部局灶性磨玻璃密度灶(f GGO)的细节显示。方法:临床低剂量肺癌筛查中检出的连续20例f GGO患者(男9例,女11例,35~74岁,平均53±11岁)纳入研究,前10例对病灶范围进行常规超高分辨率靶扫描和G-方案扫描,后10例利用筛查原始数据对病灶范围进行回顾性1024矩阵靶重建和G-方案扫描。2位高年资医生共同评价所得图像,评价指标包括:图像细节显示清晰度主观评价、病灶和周围肺野CT值,并进行统计学分析。结果:G-方案扫描图像上磨玻璃灶细节显示清晰度明显优于常规超高分辨率扫描和回顾性重建,病灶所在区域背景肺野CT值明显低于常规超高分辨率扫描(P0.05)。病灶与背景之间的密度差(即相对密度值)在各组间没有显著性差异。结论:生理通气辅助帮助背景肺过度充气,结合超高分辨率CT扫描可以增加磨玻璃灶的细节显示能力,进而提高f GGO的诊断准确率。相对密度值可能更适合磨玻璃结节的密度评价。
[Abstract]:Objective: to investigate the application of physiologic ventilation assisted ultra high resolution CT scanning (G- regimen) to improve the detail display of focal ground glass density focus (GGOs) in the lung.Methods: twenty consecutive f GGO patients (9 males and 11 females, 35 ~ 74 years old, mean 53 卤11 years old) detected in clinical low dose lung cancer screening were included in the study. The first 10 patients underwent conventional ultrahigh resolution target scanning and G- regimen scanning.In the latter 10 cases, the range of lesions was evaluated by retrospective 1024 matrix target reconstruction and G- scheme scan by using the original data of screening. The evaluation indexes included: subjective evaluation of image detail display clarity.The CT values of the lesions and the surrounding lung fields were analyzed statistically.Results compared with conventional ultrahigh resolution scanning and retrospective reconstruction, the resolution of the glass grinding focus was obviously superior to that of conventional ultrahigh resolution scan and retrospective reconstruction, and the CT value of the lung field in the area where the lesion was located was significantly lower than that in the conventional ultrahigh resolution scan (P0.05).There was no significant difference in the density difference (i.e. relative density) between the lesion and the background.Conclusion: physiological ventilation can help the background lung to inflate excessively, combined with ultra high resolution CT scan can increase the detail display ability of glass-grinding focus, and then improve the diagnostic accuracy of f GGO.The relative density value may be more suitable for evaluating the density of glassy nodules.
【作者单位】：金华市中心医院放射科;上海交通大学医学院附属新华医院放射科;
【分类号】：R734.2;R730.44

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