Quality control status test and analysis of partial radiography unit in Tianjin

ObjectiveTo understand the performance indicators of radiography unit in six district of Tianjin. We tested and analyzed the testing results of 172 radiography unit in the light of quality control inspection and evaluation methods.

MethodsThe medical institution was divide into tertiary hospital, secondary hospital, community hospital and private hospital. We tested the nine indexs of radiography unit with the Specifications for Testing of Image Quality Control in Medical X-ray Diagnostic Equipment(WS 76-2011). And only when the nine index were qualified, the radiography unit was judged to be qualified. All date were analysed by SPSS 16.0. Multi-sample rate was done by R×C Chi-square test, and multiple comparisons of rate was done by partition of Chi-square test method.

ResultsThe qualified rate of the 172 units were 69.2%. The unqualified indexs of radiography unit were the deviation of the pipe voltage indicator and the deviation of the light field from the four sides of the irradiation field. The qualified rate of state testing in tertiary hospital was 82.4%, which was higher than that 51.9% in community hospital and 54.1% in private hospital(χ²=9.272, 9.599, both P < 0.01), and these differences were all statistically significant. The occupancy rate of domestic radiography unit in tertiary hospital was 7.35%, which were lower than that 27.5% in secondary hospital, that 92.6% in community hospital and that 78.4%(χ²=7.907, 64.184, 54.478, all P < 0.01) in private hospital, and these differences were all statistically significant. And the occupancy rate of domestic radiography unit in secondary hospital were lower than that in community hospital and private hospital(χ²=27.472, 19.932, both P < 0.01), and these differences were all statistically significant. The rate of radiography unit used by tertiary hospitals over 10 years was 16.2%, which was lower than that 51.9%(χ²=12.933, P < 0.01) in community hospital, and this difference was statistically significant.

ConclusionThe performance status of radiography unit in tertiary hospital and secondary hospital of the six district of Tianjin are satisfactory, wherea community hospitals and private hospital need to optimize radiography unit and strengthen quality control management.