摘要目的：探讨品管圈活动在降低受检者胸部CT扫描辐射剂量中的应用效果。方法成立品管圈，选定活动主题，拟定活动计划，分析受检者辐射剂量大的原因，圈成员共同拟定对策并按计划实施，比较改善前后人均辐射剂量并对比图像质量，评价品管圈的活动成果。选取改善前后在本中心行胸部CT检查的受检者，共218名，平均年龄为（47.05±8.58）岁，其中男性162名，女性56名，改善前44名，改善后174名。结果胸部CT扫描人均辐射剂量由改善前13.75 mGy降至改善后3.45 mGy，目标达标率102.08%，进步率74.91%，改善前后人均辐射剂量比较，差异具有统计学意义（P<0.001）。改善前优级片率93.18%，改善后92.52%，改善前后图像质量差异无统计学意义（P>0.05）。结论“品管圈”活动应用于降低受检者胸部CT扫描辐射剂量，在减少受检者的辐射剂量的同时，保证图像质量不下降，还提高了全体圈员的思考和学习能力以及团队合作意识。

abstractsObjective To explore the effect of quality control circle (QCC) in reducing the radiation dose during chest CT scan. Methods QCC was founded, activity themes were selected, activity schedule was planned, the reasons of high radiation dose was analyzed, countermeasures were planned and implemented jointly by circle members, and then per capita radiation dose and image quality before and after improving was compared to confirm the effect of QCC activities. The subjects of chest CT scan before and after improvement in our center were selected, included totally 218 cases, their average age was (47.05 ± 8.58) years, 162 were male, 56 were female, 44 cases had CT scan before improvement, 174 cases after improvement, and the data were analyzed by T-test and Chi-square test. Results The radiation dose per capita has declined from 13.75 mGy to 3.45 mGy, The rate of standard was 102.08%, progress rate was 74.91%. The rate of high-quality image was 92.52%. Compared with per capita radiation dose before and after the activities, the differences were statistically significant(P<0.001). The rate of high-quality image was 93.18% before activities, the percentage remained steady at 92.52% after the activities, there was no statistically significant differences in image quality(P>0.05). Conclusions Application of QCC not only reduced the radiation dose of the client without image quality changes, but also improved thinking and learning capacity, cooperative consciousness of the circle members.