Objective To analyze the quality control acceptance test results of partial types of medical digital radiography equipment, evaluate their application quality and provide references for the subsequent detection.

Methods According to the Specifications of the quality control testing of medical X-ray diagnostic equipment (WS 76-2017) and the Specifications of quality control testing in medical digital radiography (DR) systems (WS 521-2017), 17 types (19 sets in total) of newly installed medical digital radiography equipment in Tianjin and Inner Mongolia from January 2018 to June 2019 were selected as the research objects. General and special test items, such as the deviation of tube voltage indication, output repeatability, dark noise, limited spatial resolution and low contrast details, and so on, were tested. Finally, the test results were recorded and analyzed.

Results In addition to dark noise, detector dose indication, limited spatial resolution, low contrast detail detection, automatic exposure control (AEC) sensitivity, and AEC tube voltage change consistency to establish the baseline value, the detection results of other medical digital radiography equipment met the requirements of WS 76-2017 and WS 521-2017. The deviations of 60 and 80 kV tube voltage indication ranged from −3.61% to 2.71%, whereas the deviations of 100, 117, 120 and 121 kV tube voltage indication ranged from −2.9 to 4.9 kV. Meanwhile, the repeatability of output ranged from 0.0290% to 1.4700%, and the useful harness half value layers corresponding to 80 and 81 kV were between 2.5 and 5.9 mmAl. The deviations of exposure time indication in the range of ≥100 ms and <100 ms were −5.19% to 2.40% and −7.15% to 2.80%, respectively. There were no residuals and artifacts found in the imaging. The baseline values established by dark noise detection ranged from 14.2 to 5262.0, whereas the baseline values established by the detector dose indication were between 188 and 60,280. The baseline values of AEC sensitivity and those of the AEC tube voltage change consistency ranged from 0.67 to 6.90 mAs and from 2.20 to 6.69 μGy, respectively. The measurement results of response uniformity were between 0.11% and 4.70%. The ranging error were −0.40%−1.45%. The consistency between AEC ionization chambers were −8.70%−5.15%. The results of the limit spatial resolution in the horizontal and vertical directions ranged from 2.2 to 3.7 lp/mm and 2.2 to 3.4 lp/mm, respectively. Finally, the determination coefficients of the fitting formulas of signal transmission characteristics were all greater than 0.98.

Conclusions The quality control acceptance test results of the medical digital radiography equipment met the requirements of the WS 76-2017 and WS 521-2017 standards. Clear and complete test conditions and acceptance test results can provide reference for the subsequent tests.