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目的了解云南省部分医疗单位的医用诊断X射线装置的性能状况。方法依据国家标准,采用非介入式多功能X射线机QA仪和检测箱现场检测。结果管电压指示偏离范围在-8.7%～7.8%,输出量范围在0.964～10.35mGy/100mAs,输出量重复性范围在0.00%～6.680%,输出量线性范围在-10.22%～6.86%,曝光时间指示偏离范围在-16.1%～11.09%,有用线束垂直度偏离范围在≤30～60和≥60,空间分辨力范围在0.8～1.6LP/mm,低对比度分辨力范围在2%～4%,1.5mm之间。结论输出量重复性、输出量线性、管电压指示的偏离、空间分辨力合格,不合格率较高的是曝光时间指示偏离,占总检测台数的15.9%,有用线束垂直度偏离不合格占总检测台数的9.09%,低对比度分辨力不合格占总检测台数的2.27%。
Objective To understand the performance of medical diagnostic X-ray devices in some medical units in Yunnan Province. Methods According to national standards, non-invasive multi-function X-ray machine QA instrument and test box on-site testing. As a result, the tube voltage deviation ranged from -8.7% to 7.8%, the output ranged from 0.964 to 10.35 mGy / 100mAs, the output ranged from 0.00% to 6.680%, and the output ranged from -10.22% to 6.86% The deviation of time indication ranged from -16.1% to 11.09%, the deviation range of useful strand perpendicularity was ≤30-60 and ≥60, the spatial resolution range was from 0.8-1.6LP / mm, the range of low contrast resolution was from 2% to 4% , 1.5mm between. Conclusion The repeatability of output, the linearity of output, the deviations of tube voltage indication and the spatial resolution are qualified. The higher the unqualified rate is the indication deviation of exposure time, accounting for 15.9% of the total number of tests. 9.09% of the number of detection stations, low contrast resolution failed to account for 2.27% of the total number of tests.