应用64排螺旋CT低剂量技术检查儿童颞骨结构的探讨  

Low dose scanning using 64-detector row computer tomography in pediatric temporal bone

作　　者：严超贵[1] 彭谦[1] 范淼[1] 杨智云[1] 陈星[1] 孟悛非[1] 

机构地区：[1]中山大学附属第一医院放射科,广州510080

出　　处：《影像诊断与介入放射学》2008年第6期245-247,共3页Diagnostic Imaging & Interventional Radiology

基　　金：2007年广东省科技计划项目支持;项目编号:2007B060401012;2008年广东自然科学基金博士科研启动项目编号:845100890100076

摘　　要：目的探讨儿童颞骨结构的64排CT低剂量扫描的最低管电流。方法选取临床怀疑中耳病变而来放射科行CT检查的患儿180例随机分为3组。扫描设备为东芝Aquilion64排螺旋CT机。其他扫描条件固定,每组分别以常规剂量组(150mA以上)、30mA、20mA管电流进行扫描。将扫描后重建图像随机分配至教授、副教授及技师各一人采用双盲法进行阅片,评价不同扫描剂量对于颞骨结构的显示情况,以取得一致意见为准。以常规剂量图像作为基础片,颞骨解剖结构能清楚显示的为合格,不能清楚显示的为不合格。评价结果进行多次配对设计两样本的卡方检验。结果本组实验得到儿童颞骨64排CT低剂量扫描管电流的最低值是30mA。结论儿童颞骨64排低剂量CT扫描可以可获得符合临床诊断需求的图像信息,因而能应用于临床。Objective To study the lowest electric current of 64-detector row CT that could manifest the normal structure of pediatric temporal bone. Methods 180 cases of pediatric temporal bone examined by Toshiba Aqnilion 64-detector row CT were collected. These cases were divided into 3 groups （≥ 150 mA, 30mA, 20mA） randomly. Other scan parameters were fixed. The reconstruct image quality was evaluated by one professor, one associate professor and one technologist randomly with double-blind method. The image quality scanned with routine dose was used as the standard. The image qualities of all the films with different mA were evaluated respectively according to the various structures of temporal bone. All the results were analyzed by Chi-square test. Results The lowest dose for pediatric temporal bone scanning with 64-detector row CT was 30mA. Conclusion Low dose CT scanning obtained by 64- detector row can get images that satisfied clinical demand, and it can be used in clinic.

关 键 词：颞骨 多层 体层摄影术 X线计算机 低剂量 辐射 

分 类 号：R816.96[医药卫生—放射医学]