目的探讨不同剂量多层螺旋计算机断层扫描(MSCT)胸部扫描对尘肺病的筛查效果。方法采用随机抽样方法,抽取40名粉尘作业工人,分别采用常规剂量(管电压130 k V,管电流25.0~75.0 m As)与方案1(管电压110 k V,管电流50 m As)、方案2(管电压110 k V,管电流16.0 m As)、方案3(管电压80 k V,管电流16.0 m As)的低剂量扫描,分别对轴位1.5 mm薄层高分辨率重建、5.0 mm普通层厚高分辨率重建和5.0 mm厚层冠状位最大密度投影的重建图像进行对比分析。结果方案1和方案2的图像质量得分和低剂量MSCT图像评价得分均优于方案3(P<0.01)。方案1和方案2的图像对40名研究对象的p、q、s和t小阴影均能显示;除方案2对t小阴影显示的得分外,方案1和方案2的图像对4种小阴影显示的得分分别与常规剂量组比较,差异均无统计学意义(P>0.02)。方案3的图像对4种小阴影的显示明显减少,伪影较多;该方案的图像对p、q和t小阴影显示的得分均低于常规剂量组(P<0.01)。评价MSCT辐射剂量的指标容积CT剂量指数、加权CT剂量指数、剂量长度乘积和平均有效剂量,在4种...
【英文摘要】
Objective To explore the effects of different doses of chest multislice spiral computed tomography( MSCT) in screening pneumoconiosis. Methods Forty workers exposed to coal dust and silica dust were selected by random sampling method,and scanned by conventional dose( 130 k V,25. 0-75. 0 m As) and low-dose of MSCT which included program 1( 110 k V,50. 0 m As),program 2( 110 k V,16. 0 m As) and program 3( 80 k V,16. 0 m As) respectively. Comparative analysis was given to the reconstructions of high-resolution...