基于头围的固定管电流在儿童头颅CT检查中的应用价值  

Application values of fixed tube current based on head circumference in children's head CT examinations

作　　者：张见 边传振 张晓军 ZHANG Jian;BIAN Chuanzhen;ZHANG Xiaojun(Department of Radiology,the Children's Hospital of Nanjing Medical University,Nanjing 210000,China)

机构地区：[1]南京医科大学附属儿童医院放射科,江苏南京210000

出　　处：《实用放射学杂志》2024年第1期115-118,共4页Journal of Practical Radiology

基　　金：江苏省政府留学基金项目(JS-2018-137);江苏省妇幼保健课题(FYX201816);南京市医学科技发展基金项目(QRX17169)。

摘　　要：目的探讨基于头围(HC)的固定管电流在儿童头颅CT检查中的应用价值。方法回顾性收集573例儿童头颅CT影像资料,分别记录其管电流和HC,Pearson分析HC与管电流相关性,以HC为分组统计各分组对应的管电流中位数并以此作为前置固定管电流。前瞻性收集患儿72例,采用随机数表法将患儿分为对照组(35例)及实验组(37例)。对照组管电流采用自动曝光控制(AEC)技术,实验组采用基于HC分组对应的管电流中位数,比较2组患儿辐射剂量及图像质量差异。结果Pearson分析573例回顾性资料,HC与管电流呈较强正相关性(r=0.95,P<0.001);基于HC分组对应的管电流中位数为70~130mAs;对照组及实验组容积CT剂量指数(CTDI_(vol.16))和基于水当量直径(DW)的体型特异性剂量估算值(SSDE_(DW))组间差异均有统计学意义(t=-11.27、2.81,P<0.05),实验组CTDI_(vol.16)、SSDE_(DW)较对照组分别降低10.83%、12.59%;实验组及对照组图像信噪比(SNR)组间差异无统计学意义(t=-1.26,P>0.05);图像主观评价组间差异亦无统计学意义(Z=-0.45,P>0.05)。结论检查前测量患儿的HC,并以此为依据设置固定管电流行CT检查,可以在保持图像质量的前提下降低其辐射剂量。Objective To explore the application values of fixed tube current based on head circumference(HC)in children's head CT examinations.Methods A total of 573 children's head CT imaging data were collected retrospectively,the tube current and HC were recorded.Pearson's correlation analysis was used to determine the relationship of tube current with HC,counted the median tube current values of each group based on HC and used them as the prefixed tube current.Seventy-two children were prospectively collected.According to the random number table method,the children were divided into the control group and the experimental group,with 35 cases in the control group and 37 cases in the experimental group.The control group used automatic exposure control(AEC)technology for tube current,while the experimental group used the median value of tube current corresponding to HC grouping.The difference in radiation doses and image qualities between the two groups was compared.Results Pearson analysis of 573 retrospective cases showed that the correlation between HC and tube current was considerably strong(r=0.95,P<0.001).The median tube current values of each group based on HC were 70-130 mAs.There were statistically significant differences in CTDI_(vol.16) and SSDE_(DW) based on water equivalent diameter(DW)between the two groups(t=-11.27,2.81,P<0.05).Compared with the control group,CTD_(vol.16) and SSDE_(DW) in the experimental group decreased by 10.83%and 12.59%respectively.There were no statistically significant differences in signal-to-noise ratio(SNR)between the two groups(t=-1.26,P>0.05)and there were also no statistically significant differences in the subjective evaluation of images(Z=-0.45,P>0.05).Conclusion Measuringchildren's HC before examination and setting the fixed tube current corresponding to HC grouping can reduce radiation doses while maintaining image qualities.

关 键 词：儿童 头围 管电流 辐射剂量 图像质量 

分 类 号：R726.8[医药卫生—儿科] R814.42[医药卫生—临床医学]