优化CT扫描参数在小儿头颅疾病检查中的应用  

Optimized Application of CT Scanning Parameters in Children Undergoing Head Check-ups

作　　者：郑巧[1] 邹建华[1] 

机构地区：[1]湖北医药学院附属太和医院放射影像中心,湖北十堰442000

出　　处：《临床误诊误治》2013年第3期65-68,共4页Clinical Misdiagnosis & Mistherapy

摘　　要：目的探讨小儿头颅CT扫描参数变化对辐射剂量的影响及优化扫描参数的临床应用价值。方法选择我院疑诊头颅疾病需行CT扫描的不同年龄患儿300例,根据扫描参数管电压及管电流及螺距的不同分为以下3种情况:①A组管电压改变(80～120 kV),管电流及螺距不变;②B组管电流改变(100～300 mA),管电压及螺距不变;③C组螺距改变(0.8～1.5 mm),管电压及管电流不变。比较3种情况CT剂量加权指数(CTDIw)。结果 A组管电压80、100、120 kV时CT-DIw分别为(10.236±0.356)、(21.446±0.815)、(34.512±0.736)mGy;B组管电流100、200、300 mA时CTDIw分别为(12.293±0.226)、(23.446±0.915)、(35.842±0.736)mGy;C组螺距0.8、1.0、1.5 mm时CTDIw分别为(44.246±0.126)、(35.446±0.815)、(23.842±0.736)mGy。3种情况组内比较差异均有统计学意义(P<0.05)。结论在保证诊断质量的前提下,CT检查时适当降低管电压、管电流,提高螺距,可使辐射剂量明显降低。Objective To explore effect of parameter changes on radiation dose of head CT scans in children and clini- cal value of CT scanning parameter optimization. Methods A total of 300 patients of different ages with suspected cranial dis- eases, who would take CT scaning were divided into 3 groups by the tube voltage, tube current and pitch of scanning parameters ： group A with the voltage change （80-120 kV）, changeless pitch and tube current; group B with change of tube current （100- 300 mA）, changeless tube voltage and pitch; group C with pitch change （0.8-1.5 ram） , changeless tube voltage and tube cur- rent. CT dose weighted index numbers （CTDIw） of the 3 groups were compared. Results The CTDIw were（ 10.236 ± 0.356）, （21.446±0.815） and （34. 512 ±0.736） mGy respectively in group A, when tube voltages were 80, 100 and 120 kV corre- spondingly ; the CTDIw were （ 12. 293 ± 0. 226） , （23. 446 ± O. 915 ） and （ 35. 842 ± 0. 736 ） mGy respectively in group B, when the tube currents were 100, 200 and 300 mA correspondingly; the CTDIw were （44. 246 ± 0. 126 ） , （35. 446 ± 0. 815 ） and （23. 842 ± 0. 736） mGy respectively in group C ; when the pitches were 0.8, 1.0 and 1.5 mm correspondingly, the differences of the three groups were statistically significant （P 〈 0. 05）. Conclusion On the premise of ensuring the quality of diagnosis, ap- propriate reductions of tube voltage and tube current, and increase of pitch in head CT examination for children can significantly reduce radiation dose.

关 键 词：儿童 头部 体层摄影术 螺旋计算机 

分 类 号：R816.92[医药卫生—放射医学]