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目的探讨多层螺旋CT低剂量扫描在儿童鼻咽部检查中的应用价值。方法将42例患者随机分为两组各21例,在其他扫描参数不变的情况下,A组用100mA扫描,B组用40mA扫描,比较两组图像质量与受检者的辐射剂量。结果两组图像评分均数比较虽有统计学差异,但B组图像评分均数为3.6105,可满足临床诊疗需要;两组腺样体平均CT值之间无统计学差异,CT值标准偏差之间有统计学差异;与A组比较,B组容积CT剂量指数(CTDIvol)和剂量长度乘积(DLP)约降低了60.00%。结论 120kV、40mA低剂量儿童鼻咽部CT检查,既能保证图像质量,又有效降低了辐射剂量。
Objective To investigate the value of low-dose multislice spiral CT in nasopharyngeal examination in children. Methods Twenty-two patients were randomly divided into two groups (n = 21). Under the same scan parameters, group A was scanned with 100mA, group B was scanned with 40mA, and the image quality of the two groups was compared with that of the subjects. Results Although there was statistical difference between the two groups, the mean image score of group B was 3.6105, which could meet the needs of clinical diagnosis and treatment. There was no significant difference between the two groups in average CT value of CT images There was a significant difference between the two groups. Compared with group A, the volumetric CT dose index (CTDIvol) and dose length product (DLP) of Group B decreased about 60.00%. Conclusion Nasopharyngeal CT examination of 120kV, 40mA low dose children not only can guarantee the image quality, but also reduce the radiation dose effectively.