数字X射线摄影的质量保证与质量控制

Quality assurance and quality control of X-ray digital radiography

目的:探讨数字X射线摄影DR的质量控制方法,提高摄影图像质量。方法:利用检测摸体和质量控制检测装置,对4台不同型号的DR进行检测。结果:被测4台机器,密度分辨率均达到7级;低对比度测试,两台显示0.5 mm的小孔,两台可显示到0.3 mm;100阶铝梯测试,其中两台机器全部显示,一台显示86阶、一台显示95阶;空间分辨率均能达到3.6LP/mm,光野偏差均<2%。质量控制后使图像质量明显提高,照片优质率达到90%以上。结论:全方位质量控制还应包括设备和使用人员的规范化操作,只有这样才能确保图像质量优质稳定并延长机器寿命。

Objective： To discuss the method for quality control of X-ray digital radiography （DR） and improvement of the image quality. Methods： Four DR machines were detected with detecting phantom and detecting equipment of quality control. Results： The density resolution of the four machines which were detected could achieve grade 7. Low contrast resolution test showed two machines could display the holes with the diameter of 0.5mm, and the other two could display the holes with the diameter of 0.3mm. In 100 grade aluminum ladder test, 100 grade could be distinguished by two machines, while 86 grade could be distinguished by one machine, and 95 grade could be distinguished by another machine. Spatial resolution of the four machines could reached 3.6LP/mnl respectively, and the light field deviations were less than 2%. The image quality was improved significantly after quality control of the DR machines was carried out, and more than 90% of thg images were excellent. Conclusion： Comprehensive quality control includes the equipment and personnel＇s standardized operations, so that the excellent and stable image quality can be guaranteed and the life of DR machines can be prolonged.