全数字化乳腺X射线成像系统自动曝光控制可重复性及探测器均匀性检测

Test AEC repeatability and detector uniformity of full field digital mammography system

目的:研究数字乳腺X射线摄影(DR)自动曝光控制(AEC)可重复性及探测器均匀性检测方法。方法:使用M12乳腺X射线机性能测试模体,对AEC重复性及探测器均匀性进行检测。参考标准:最大相对误差<10%,异变系数<5%,结果:1AEC可重复性检测最大相对误差为0.45%,异变系数为0.41%,自动曝光控制重复性检测符合标准要求;2探测器均匀性测量的最大相对误差为2.83%,参考标准最大相对误差<7%,探测器均匀性检测通过。结论:该检测方法可有效对全数字化乳腺X射线成像系统的AEC可重复性及探测器均匀性进行检测,通过检测可快速掌握系统稳定性和可靠性,保证设备始终处于良好的工作状态。

Objective To investigate the skill of test the AEC repeatability and detector uniformityof full field digital mammography system. Methods： AEC reproducibility and detector uniformityof full field digital mammography system were measured using M12 breast X-ray performancetest phantom. Reference standard： the maximum relative error was lower than 10% and variationcoefficient lower than 5%. Results： ①The maximum relative error and coefficient of variationwere 0.45% and 0.41% and AEC met requirements of the standard. ②The maximum relative errorof detector uniformity was 2.83% meeting requirements of the standard. Reference standard： themaximum relative error was lower than 7%. Conclusion： The stability and effectiveness of the fullfield digital mammography system were reflected by testing the AEC reproducibility and detectoruniformity, to ensure the system was in good working condition.