摘要
目的探讨Asir-V技术在儿童胸部低剂量扫描中的应用价值。方法对60例患儿根据Asir-V的设置随机分为3组,每组20例,Asir-V分别为30%、50%和70%。每例分别测量胸廓入口层面,气管分叉层面,心底层面背部肌肉CT值的标准差(Standard Deviation,SD)为背景噪声指数,记录每个病例的剂量长度乘积(Dose-Length Product,DLP),并根据公式换算有效剂量,比较3组SD和有效剂量(Effective Dose,ED)值。结果 3组病例SD分别为21.74±1.39、2 1.4 2±1.6 7和2 2.0 7±1.9 9,D L P分别为(1 8.9 9±9.5 5)、(1 2.7 7±4.2 2)和(7.45±2.01)m Gy·cm,ED分别为(0.57±0.21)、(0.34±0.10)和(0.20±0.05)m Sv,3组SD值相当,任意两组差异(P>0.05)无统计学意义,ED递减,任意两组差异(P<0.01)有统计学意义。读片结果各病例图像质量良好(≥3分),两位医师图片一致性良好。结论 Asir-V技术在保证图像质量的同时,可有效降低辐射剂量,对儿童胸部低剂量扫描有重要价值。
Objective To explore the application value of Asir-V technology in low dose chest scanning in children.Methods Sixty cases were randomly divided into three groups(20in each group)based on different algorithms:group A(Asir-V:30%),group B(Asir-V:50%),group C(Asir-V,70%).The SD of muscle of back in thoracic inlet level,trachea bifurcation level and the bottom of heart level were used as the background noise index.The dose length product of each case was recorded,and the effective dose was calculated according to the formula.The SD and ED values were compared among the3groups.Results The SD values in the three groups were21.74±1.39,21.42±1.67and22.07±1.99,respectively.The DLP values were(18.99±9.55),(12.77±4.22)and(7.45±2.01)mGy·cm.ED values were(0.57±0.21),(0.34±0.10)and(0.20±0.05)mSv,respectively.There were no significant difference between any two groups for SD value(P>0.05).However,there were significant differences for ED value in any two groups(P<0.01).Conclusion Asir-V technology is not only ensure the quality of the image,but also effectively reduce the radiation dose.So it has great value for low dose scanning in children’s chest.
作者
董丽娜
DONG Lina(Department of Medical Imaging, Xuzhou Children’s Hospital, Xuzhou Jiangsu 221000, China)
出处
《中国医疗设备》
2018年第1期69-71,81,共4页
China Medical Devices
关键词
迭代算法
滤波反投影法
小儿胸部
低剂量
多层螺旋CT
iterative algorithm
filtered back projection
children’s chest
low dose
multi-slice spiral computed tomography
作者简介
作者邮箱:994469321@qq.com
