低剂量容积数据高分辨率CT应用于肺部体检的参数优化

发布时间：2018-01-31 20:12

本文关键词： 低剂量容积数据高分辨率CT 肺部体检　出处：《海南医学》2016年22期 　论文类型：期刊论文

【摘要】：目的探讨低剂量容积数据高分辨率CT(VHRCT)应用于肺部体检扫描的最佳参数。方法将本院2013年10月至2015年7月500名肺部健康体检者简单随机化分成5组,各组100名,管电流分别为常规剂量220 m A和低剂量35 m A、30 m A、25 m A、20 m A,管电压均为120 k V扫描,容积数据进行薄层高分辨率算法重组,以能显示肺小叶水平上的细微结构和病变以及大血管的边界为保证诊断质量的图像。记录各组受检者的照射剂量,对不同低剂量管电流和常规剂量的VHRCT图像进行统计学分析。结果 35 m A、30 m A、25 m A、20 m A低剂量与常规剂量220 m A相比,受检者的照射剂量分别下降85.64%、87.86%、90.24%、92.53%。35 m A、30 m A、25 m A和220 m A常规剂量VHRCT图像比较差异均无统计学意义(P0.05),20 m A和常规剂量比较差异有统计学意义(P0.05)。结论 25 m A的管电流可作为低剂量容积数据高分辨率CT应用于肺部体检的参考条件。
[Abstract]:Objective to investigate the high resolution CTG VHRCT with low dose volume data. Methods from October 2013 to July 2015, 500 patients were randomly divided into five groups. There were 100 patients in each group. The current of the tube was 220mA at the conventional dose and 20mA at the low dose of 35mAm (35mAL). The voltage of the tube is 120 kV, and the volume data are reconstructed by thin-layer high-resolution algorithm. Images showing fine structures and lesions at the pulmonary lobular level, as well as the boundaries of the large vessels, were used to ensure diagnostic quality. Radiation doses were recorded for each group of subjects. The VHRCT images of different low dose tube current and conventional dose were analyzed statistically. The low dose of 20mA was 85.64% lower than the conventional dose of 220mA, and 90.24% lower than that of the normal dose of 220mA. There was no significant difference in conventional VHRCT images between 30 Ma and 220mA. There was no significant difference between the two groups (P 0.05). The difference between 20mA and conventional dose was statistically significant (P0.05). Conclusion 25 Ma tube current can be used as a reference for the application of low dose volume data and high resolution CT in lung physical examination.
【作者单位】：上海市嘉定区安亭医院放射科;
【基金】：上海市嘉定区科委基金资助项目(编号:2013-KW-15)
【分类号】：R734.2;R730.44
【正文快照】： 肺癌是我国城市癌症死亡率第一位的恶性肿瘤,多数肺癌早期无明显临床症状,约75%的肺癌患者在确诊时已属晚期,5年生存率约为15.6%[1],仅有不到25%的患者适合手术治疗[2]。早期发现无症状肺癌及其他肺部疾病的有效方法是对人群的肺部体检。CT与X线胸片相比,明显提高了肺部疾病的

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