目的 探讨高端影像学体检人群历年X线检查辐射受照情况、可能带来的危害及防护策略。方法 分析研究对象X线检查数据,评估其年剂量以及累计辐射剂量;按年受照剂量分组,分析其重复照射部位阳性变化与受照剂量相关性。结果 研究对象X线年均人受照剂量4.59 mSv,达到中剂量辐射水平(3~20 mSv)。其中,116人至少接受了2次某个部位的CT重复检查,34人有阳性改变,中剂量组25人(占73.53%),低剂量组9人,检测阳性率、阴性率在两组间无统计学意义。低辐射组(43.33%)与中辐射组(56.67%)两组间性别、年龄比较差异无统计学意义。结论 该群体X线检查累计辐射剂量偏大;不少人接受了不必要的CT检查;重视和探讨体检人群辐射危害控制策略意义重大。

Objective To study X-ray radiation exposure among recipients of physical checkups via high-end imaging in order to reduce possible hazards.Methods The data on X-ray examinations among these subjects was analyzed, their annual dose and cumulative radiation dose were calculated, and they were grouped by the annual average dose. The correlations between the positive changes in spots of repeated irradiation and the dose of irradiation were analyzed.Results The annual average dose of X-ray irradiation among these subjects was 4.59 mSv, and reached the medium dose level (3-20 mSv). 116 of these subjects received repeated CT examination at the same spot. Among the 34 subjects with positive changes, 25(73.53%) were in the middle radiation dose group and 7 in the low radiation dose group. There was no statistically significant difference in positive or negative rates of detection between the two groups. There was also no statistically significant difference in gender or age between the low dose radiation group (43.33%) and middle dose radiation group (56.67%).Conclusions The cumulative radiation dose of X-ray is somewhat large in this population. Many people have been subjected to unnecessary CT examinations. How to protect this population from radiation hazards is of great significance.