CT常规剂量和低剂量扫描对外伤性肋骨骨折影像质量的影响

Application of Low-dose MSCT Scan on Patients with Traumatic Rib Fractures

目的探讨CT常规剂量和低剂量扫描对外伤性肋骨骨折影像质量的影响。方法选取2014年4月至2018年6月我院收治的肋骨骨折患者120例,回顾性分析其常规剂量以及低剂量胸部CT扫描图像结果,比较图像质量、诊断能力以及辐射剂量差异。结果常规剂量扫描与低剂量扫描患者下肺、中肺、上肺以及全肺图像质量评分差异无统计学意义(P>0.05);常规剂量共检测出172处骨折,其中完全性骨折142例,不完全骨折30例,低剂量CT共检测出169处骨折,其中完全性骨折142例,不完全骨折27例,二者诊断符合率为98.26%,其中完全性骨折诊断符合率为100.00%,低剂量模式下漏诊3例不完全骨折,诊断符合率为90.00%;低剂量扫描患者容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效剂量(ED)水平均明显低于常规扫描,差异有统计学意义(P<0.05)。结论低剂量CT扫描能降低辐射剂量,同时保证图像质量,保障诊断结果的准确性。

Objective To explore the effects of conventional dose and low-dose CT scans on the image quality of traumatic rib fractures.Methods A total of 120 cases of patients with rib fractures admitted to our hospital from April 2014 to June 2018 were selected.The images results of conventional dose and low-dose chest CT scans were analyzed retrospectively.The image quality and diagnostic capabilities of conventional dose and low-dose,and the receptive radiation dose of patients were compared.Results There were no significant differences in image quality scores of lower lung,middle lung,upper lung and whole lung between conventional dose scan and low-dose scan(P>0.05).A total of 172 fractures were detected by conventional doses(including 142 complete fractures and 30 incomplete fractures),and 169 fractures(including 142 complete fractures and 27 incomplete fractures)were detected by low-dose CT,and the diagnostic coincidence rate of the two methods was 98.26%,and the diagnostic coincidence rate of complete fractures was 100.00%,and 3 incomplete fractures were missed under low-dose model,and the diagnostic coincidence rate was 90.00%.The volume CT dose index(CTDIvol),dose length product(DLP)and effective dose(ED)by low-dose scan were significantly lower than those by conventional scan(P<0.05).Conclusion Low-dose CT scan can reduce the radiation dose,and can ensure the quality of examination images and ensure the accuracy of diagnostic results.