胸部摄影附加滤过对辐射剂量的影响

The Effect of Additional Filtration on Radiation Dose in Chest Radiography

目的探讨不同附加滤过对成人胸部高电压X射线摄影的图像质量、辐射剂量和X射线管负荷的影响,筛选合适附加滤过厚度,优化临床摄影参数。资料与方法分析心脏手术前后进行检查的32例患者采用0、0.1、0.2、0.3mm铜附加滤过胸部摄影图像的质量,并进行患者皮肤入射剂量和散射线剂量率标准水模实验测试。结果随着附加滤过板厚度的增加,患者皮肤入射剂量下降约30%,管负荷增加,室内散射线剂量率明显减少。32例患者不同厚度滤过板的各图像质量均具有一致性(P<0.01)。结论摄影时选用一定厚度的附加滤过板可以减少患者表面剂量,同时不会造成X射线图像质量下降。进行成人胸部高仟伏摄影时,宜添加0.1～0.2mm的铜附加滤过,以达到防护最优化要求。

Purpose To investigate the effect of different additional filtering on image quality,radiation dose and X-ray tube load of high-voltage adult chest radiography,screen suitable thickness of additional filtering,and optimize clinical parameter.Materials and Methods Statistic analysis of chest radiography image quality with additional filtering at different thicknesses （0,0.1,0.2,and 0.3mm） were performed in 32 patients before and after heart surgery.The skin dose and scatter radiation dose rate were measured.Results With the increase of additional filtration thickness,the patient skin dose was decreased by about 30%,and mAs was increased.Image analysis showed the image quality was consistent （P 0.01）.Conclusion The patient dose can be reasonably reduced by increasing the thickness of additional copper filtration without degradation of image quality.