颅脑损伤患者低剂量CT扫描研究

The study of low dose parameter by helical CT scanning for patients with cerebral injury

目的评价低剂量CT平扫在颅脑损伤患者的临床应用价值。方法 50例颅脑损伤患者,男性,31例,女性,19例,平均年龄35.25岁;第一次头颅CT扫描采用常规剂量(120KV、260mAs),复查采用3次低剂量(120KV、140 mAs)、(120KV、100 mAs)、(120KV、80 mAs)。对图像质量及射线剂量进行评价。结果常规剂量260mAs与140mAs、100mAs、80mAs扫描对颅脑损伤患者诊断准确性分别为94.0%、92.0%、90.0%、90.0%,差异无统计学意义(P>0.05);80mAs图像噪声值为5.86±0.12,常规剂量噪声值为3.04±0.45,两种剂量噪声值差别具有统计学意义(P<0.05)。140 mAs、100mAs、80mAs射线剂量明显减低,分别为常规剂量的53.8%、38.4%、30.7%(P<0.05)。结论双排螺旋CT低剂量扫描技术在颅脑损伤患者复查的应用是可行的。

Objective To evaluate the clinical value of low dose scaning by helical CT for patients with cerebral injury.Methods 50 patients with cerebral injury received conventional dose CT scanning,male 31,female 19,with mean age 35.25 years old.The first time CT scanning for dignosis using 120Kv,260mAs,then reviewed CT using low dose CT scanning（120Kv,140,100,80mAs）,the differences of qualitative diagnosis for lesions and radiation dose were observed and compared.Results There was no significant difference in diagnosis veracity between conventional dose CT scanning and low dose CT（94.0%,92.0%,90.0%,90.0%,P 0.05）,but the noise was higher in 80mas group than in conventional dose group（5.62 ± 0.56,3.12 ± 0.26,P 0.05）,however,the radiation dose of low dose CT scanning were 53.8% 、38.4% 、30.7%（120KV,140 mAs、100mAs、80mAs）,they were lower than conventional group（120KV,260mAs）.Conclusion Low dose CT scanning technique is suitable for cerebral injury.