低剂量多层CT在肋骨骨折诊断中应用价值的探讨

目的：探讨低剂量多层CT在肋骨骨折诊断中的应用价值，以期能达到临床诊断要求的同时减少受检者接受的辐射剂量。方法：对80例胸部外伤行胸部CT平扫检查的患者随机分为两组，即常规剂量组（120 kV，220 mA）和低剂量组（120 kV，120 mA），每组40人，分析比较两组肋骨的CT图像质量、CT剂量加权指数和肋骨骨折的诊断率。结果：低剂量多层CT胸部检查的图像质量能够满足肋骨骨折的诊断要求，低剂量组CT和常规剂量组对肋骨骨折的正确诊断率比较差异无统计学意义（P〉0.05），而低剂量组的CT剂量加权指数仅为常规剂量组的55.39%。结论：低剂量CT胸部检查图像质量既可满足临床对肋骨骨折诊断的要求，又可减少患者的辐射剂量，值得临床应用推广。

The Value of Low-dose Multisliced CT Examination in the Rib Fractures

Objective：To investigate the value of low-dose multisliced CT examination in the rib fractures in order to reduce radiation dose in the clinical diagnosis. Method：Eighty patients with chest trauma underwent CT examination with different CT scanning doses. All patients were randomly divided into two groups,including the conventional dose group（40 patients）and low-dose group（40 patients）. The analysis of chest CT image quality, volume CT dose index and the numbers of rib fractures were done. Result：Low-dose multisliced CT image quality of the chest could meet the diagnostic requirements of rib fractures. There was no statistical significance in the diagnostic rate of rib fractures between the conventional dose group and the low-dose group（P〉0.05）. The volume CT dose index in the low dose group was only 55.39%of that in conventional dose group. Conclusion：Low-dose CT image quality can meet the requirements of clinical diagnosis of rib fractures while reducing the dose of radiation received by the subjects,which is worthy of promotion of clinical application.