低剂量与常规剂量CT显示肺支气管的对照研究

Segmental and subsegmental bronchi:experimental study with low-dose helical CT

目的探讨低剂量螺旋CT检查肺段及亚段支气管的价值。方法将100例肺部正常者分成两组,其中60例做低剂量扫描,40例做常规剂量扫描,比较两组的检查结果。结果两组双肺各叶支气管显示率均为100%(P>0.05);多数段支气管显示率两组差异无统计学意义(P>0.05),但右肺中叶外段及左肺上叶尖后段两组之间差异有统计学意义(P<0.05);两组右肺上叶后段、下叶背段、左肺上叶前段及舌叶上段的亚段支气管显示率差异有统计学意义(P<0.05)。结论低剂量螺旋CT适合于检出肺叶及大多数肺段支气管的病灶,但亚段支气管的检查以作常规剂量CT为宜。

Objective To explore the value of low-dose helical CT(LD-CT)in showing segmental and subsegmental bronchi.Methods Saubjects without respiratory diseases were classed into two groups.Among them,60 cases were undergone with LD-CT at 20mA and 40 cases with standard-dose CT(SD-CT)at 150 mA.Results The visualization of all of lobar bronchi of the both lung was 100% either LD-CT or SD-CT.No difference was found in the detection of most of segmental bronchi of the right or left lung by LD-CT and SD-CT(P>0.05),except the lateral segment of the right middle lobe and apical-posterior segment of the left upper lobe.There was a statistical significance between LC-CT and SD-CT in showing subsegmental bronchi of the posterior segment of the right upper lobe and superior segment of the right lower lobe,the anterior segment of the left upper lobe and the upper segment of the left lingula lobe(P<0.05).Conclusion The lobar and most of segmental bronchus were visualized reliably by low-dose CT,but standard-dose CT should be used in showing the subsegmental bronchus.