DR设备利用信号传递特性得出准确剂量指示质量控制方法的研究

Research on the method of detector dose indication detection by using signal transfer property in DR equipment

李杰军 ¹程远达 ¹高艳辉 ¹王雷 ¹赵红枫¹

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作者信息

1. 北京市朝阳区疾病预防控制中心放射卫生科北京 100021
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摘要

目的:探究数字X射线摄影(DR)设备利用信号传递特性(STP)得出准确探测器剂量指示(DDI)的质量控制方法.方法:通过STP绘制拟合回归曲线,得出剂量与DDI值或像素值的计算公式,计算得出影像接收器入射空气比释动能 10 μGy对应的基线值.结果:SYNTHESIS型DR摄影机的剂量与像素值对数相关公式为y=-1 455ln(x)+7 311.1,回归到剂量x=10 μGy,得出像素值y=3 961.Brivo XR515型DR摄影机的剂量与像素值线性响应公式为y=140.33x-2.344 5,回归到剂量x=10 μGy,得出准确的像素值y=1401.结论:此方法可以准确地完成DR设备验收检测和状态检测的DDI项目,并得到客观准确的评价.

Abstract

Objective To explore the quality control method for accurate detector dose indicator(DDI)using signal transfer property(STP)in digital radiography(DR)equipment.Methods Use STP to fit the regression curve and obtain the formula for calculating the dose and DDI value or pixel value.Calculate the baseline value corresponding to the incident air release energy of the image receiver at 10 μGy.Results The logarithmic correlation formula between dose and pixel value of SYNTHESIS DR camera is y=-1455ln(x)+7311.1,regressing to dose x=10 μGy,the pixel value y=3961.The linear response formula between dose and pixel value for the Brivo XR515 DR camera is y=140.33x-2.3445,regressing to dose x=10 μGy,obtain the accurate pixel value y=1401.Conclusion This method can accurately complete the DDI project of DR equipment acceptance testing and status detection,and obtain objective and accurate evaluation.

关键词

数字X射线摄影/质量控制/验收检测/探测器剂量指示/信号传递特性/DR基线值

Key words

Digital radiography/Quality control/Acceptance testing/Detector dose indicator/Signal transfer property/DR baseline value

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基金项目

北京市朝阳区放射卫生监测项目(2023)(朝卫通字[2023]110号)

出版年

2024

影像研究与医学应用

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参考文献量11

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