[Analysis of the improvement effect of DR high kilovoltage chest radiography image quality control in Tianjin City from 2022 to 2023].

Objective: To analyze the main effect of improving the image quality of digital radiography (DR) high kilovoltage chest radiography in Tianjin, and to provide reference for the implementation of quality control work. Methods: In November 2023, the image quality evaluation results of DR high kilovoltage chest radiographs submitted for approval by Tianjin Occupational Health Inspection Institutions from 2022 to 2023 were analyzed. According to the results of the image quality review in 2022, the outstanding problems, causes and improvement plans were summarized, and the contents of the image quality improvement projects in 2023 were determined. χ(2) test was used to compare the evaluation results of DR high kilovoltage chest radiograph image quality and the differences among various specific evaluation indicators before and after the improvement, and to compare the differences of image quality evaluation results among groups participating in different quality control improvement projects after the improvement. Results: Compared with 2022, after the implementation of the quality control improvement projects in 2023, the rate of level 1 film (excellent film) and level 2 film (good film) of DR high kilovoltage chest radiographs increased by 3.7% and 20.0%, respectively, and the rate of level 4 film (waste film) decreased by 30.0%. After the implementation of the improvement projects, the non-conformity rate and the serious non-conformity rate of 7 indicators were significantly reduced (P<0.05). The medical institutions participating in the two quality control improvement projects of related training and on-site guidance increased the rate of level 2 film (good film) and decreased the rate of level 4 film (waste film) compared with the medical institutions participating in the one improvement project of related training (χ(2)=14.78, P<0.05) . Conclusion: The quality control improvement projects can improve the image quality of Tianjin DR high kilovoltage chest radiography, and the combination of relevant training and on-site guidance may have better improvement effect.