64排螺旋CT低剂量技术在儿童副鼻窦扫描中的应用效果评价

Application of 64 slice spiral CT low dose technique in paranasal sinus scanning in children

目的探讨64排螺旋低剂量技术CT在儿童副鼻窦检查中的应用。方法将60例患副鼻窦疾病儿童随机分成3组(对照组,低剂量1组,低剂量2组),分别行常规剂量(管电压100KV,管电流100 m A)及低剂量(管电压100 KV、管电流45 m A及管电压100 KV、管电流25 m A)扫描;记录并比较每位受检者CT剂量指数(CTDIw),并由2名主任医师采用盲法对各组扫面图像进行质量评判。结果低剂量1组、低剂量2组辐射剂量较对照组明显降低,下降幅度分别为59.23%及72.42%;低剂量1组图像质量较对照组下降不明显,所有图像均符合临床诊断要求,低剂量2组图像质量下降明显,有3例图像不能满足临床诊断要求。结论适当降低儿童副鼻窦扫描参数,既能得到良好质量的图像,又能有效降低受检者的辐射剂量。

Objective To explore the application of 64 slice low dose spiral CT in pediatric paranasal sinus examination.Methods Sixty children with paranasal sinuses were randomly divided into three groups（control group,low dose 1 group,low dose 2 group）,and were given conventional dose scanning（100 KV in tube voltage,100 mA in tube current）,low dose scanning（100 KV in tube voltage,45 mA in tube current）,and low dose scanning （100KV in tube voltage,25 mA in tube current）.The single scan weighted CT dose index （CTDIw） of each patient was recorded and compared;and the quality of the scanned images of each group was evaluated by two chief physicians by blind method.Results Compared with conventional dose group,low dose 1,2 groups had significantly lower CTDIw,and the dose decreased for 59.23％ and 72.42％ respectively.The image quality of the low-dose 1 group did not change significantly,and all the images could meet the requirements of clinical diagnosis;but the image quality of the low-dose 2 group decreased significantly,and the images of 3 patients could not meet the requirements of clinical diagnosis.Conclusion Appropriate reduction of scanning parameters for paranasal sinuses children can not only obtain good quality images,but also effectively reduce the radiation dose of patients.