基于Digital Diagnost型DR质量控制检测结果分析

目的 探讨Digital Diagnost型DR质量控制检测结果，同时分析不同厂家DR的信号传递特性（STP）的差异，以期为检测人员的质控和行政人员日常监管提供参考。方法 依据WS 76—2020 《医用X射线诊断设备质量控制检测规范》，对Digital Diagnost型DR的AEC重复性、AEC响应、探测器剂量指示（DDI）、STP、高对比度分辨力、低对比度分辨力等检测项目进行质量控制检测，同时选取市场上常见DR分析其STP函数关系。结果 Digital Diagnost型DR的DDI、高对比度分辨力和低对比度分辨力的基线值分别为影像中央像素值19 733、2.8 Lp/mm和H5；其他检测项目质控结果均满足WS 76—2020的要求。常见DR的STP函数关系主要为线性和对数关系，但相同厂家不同型号DR也可能具有不同的STP函数关系。结论 DR部分专用检测项目检测时，应注意多种因素的影响，同时细化检测项目的检测步骤与条件设置。在对STP进行分析时应按照厂家提供的函数关系进行模拟。

Quality control analysis of test items based on Philips Digital Diagnost DR

Objective To explore the quality control results of Digital Diagnost digital radiography (DR), and also to analyze the differences in signal transfer characteristics (STP) of DR from different manufacturers, in order to provide a reference for quality control of testers and daily supervision of administrative staff. Methods According to WS 76—2020 “Specification for testing of quality control in medical X-ray diagnostic equipment”, the test items such as automatic exposure control (AEC) repeatability, AEC response, detector dose indication (DDI), STP, high-contrast resolution, and low-contrast resolution of Digital Diagnost DR were qualitatively controlled, and several common DRs on the market were selected to analyze their STP functional relationships. Results The baseline values of DDI, high-contrast resolution, and low-contrast resolution of Digital Diagnost DR were 19733, 2.8 Lp/mm, and H5 of image central pixel value, respectively; the quality control results of other test items met the requirements of WS 76—2020. The STP functional relationships of common DRs were mainly linear and logarithmic, but different models of DR from the same manufacturer might also have different STP functional relationships. Conclusion When testing some special test items of DR, attention should be paid to the influence of a variety of factors, while refining the test steps and condition settings for the test items. The simulation should be performed in accordance with the functional relationship provided by the manufacturer when analyzing the STP.