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| Quality control analysis of test items based on Philips Digital Diagnost DR |
| ZHAO Zhixin1, SUN Gangtao2, ZHAI Zipo3, WANG Qiang1, WANG Haihua1, ZHU Bo1, QIAN Qian1, YANG Yong1, ZHAI Hezheng4 |
1. Hangzhou Hospital for the Prevention and Treatment of Occupational Disease, Hangzhou 310014 China;
2. Hubei Centers for Disease Control and Prevention, Wuhan 430070 China;
3. Hunan Prevention and Treatment Institute for Occupational Diseases, Changsha 410021 China;
4. Institute of Radiation Medicine, Chinese Academy of Medical Sciences, Tianjin 300192 China |
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Abstract 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.
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Received: 20 January 2022
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