头颈联合CTA成像技术中kV值与体质量的关系研究  

Relationship between tube voltage kV value for head and neck CT angiography and body weight

作　　者：邹才盛[1] 梁萍[1] 陈更瑞[1] 叶佳国[1] 王贤坤 陈小妹 高官华 胡宗宇 潘科 文海燕[1] 夏世豪 Zou Caisheng;Liang Ping;Chen Gengrui;Ye Jiaguo;Wang Xiankun;Chen Xiaomei;Gao Guanhua;Hu Zongyu;Pan Ke;Wen Haiyan;Xia Shihao(Department of Radiology,Beihai People's Hospital,Beihai 536000,China)

机构地区：[1]北海市人民医院放射科,北海536000

出　　处：《中国基层医药》2022年第12期1771-1776,共6页Chinese Journal of Primary Medicine and Pharmacy

基　　金：广西壮族自治区北海市科技计划项目(北科合202082049)。

摘　　要：目的探讨低千伏(kV)剂量在头颈联合计算机体层摄影血管造影(CTA)成像技术中kV值与体质量的关系。方法选取北海市人民医院2020年1月至2022年2月拟诊为头颈部血管性疾病行头颈联合CTA检查的患者120例为研究对象,按不同管电压分为三组(A组45例,管电压120 kV;B组45例,管电压100 kV;C组30例,管电压80 kV)。A组、B组根据患者体质量分为A1组15例(<70 kg)、A2组15例(70~85 kg)、A3组15例(>85 kg)、B1组15例(<70 kg)、B2组15例(70~85 kg)、B3组15例(>85 kg),C组根据患者体质量分为C1组15例(<70 kg)、C2组15例(70~85 kg),不设C3组。患者采用的对比剂均为碘佛醇。测量各组图像动脉血管CT值、图像噪声、信噪比(SNR)和对比噪声比(CNR)、有效辐射剂量(ED),并由2名高级职称医师采用5级评分法对图像进行主观评价。结果各组患者图像质量主观评分均≥3级,A1组、A2组和B1组、B2组、C1组评级差异不大,A3组、B3组、C2组与其他组评级差异明显。A1组、B1组、C1组4个不同层面血管CT值差异均有统计学意义(F=76.82、64.62、98.79、71.85,均P<0.001)。A2组、B2组、C2组4个不同层面血管CT值比较,差异均有统计学意义(F=159.82、112.33、108.22、135.18,均P<0.001)。A3组与B3组4个不同层面血管CT值差异均有统计学意义(t=4.40、4.27、3.91、3.59,均P<0.05)。B3组和C2组的图像噪声明显增加,SNR和CNR均较其他组降低。B1组比A1组ED减少47%,C1组比A1组减少73%(F=116.18,P<0.001);B2组比A2组ED减少49%,C2组比A2组减少66%(H=35.40,P<0.001);B3组ED比A3组减少35%(t=3.59,P<0.05)。结论在头颈联合CTA成像技术中kV值的选择与体质量有关,体质量<70 kg适用80 kV,体质量70~85 kg适用100 kV,体质量>85 kg用常规120 kV扫描,既可以降低患者ED又能保证图像质量,满足临床诊断的需要。Objective To investigate the relationship between tube voltage kV value for head and neck CT angiography and body weight.Methods A total of 120 patients with suspected vascular disease of the head and neck who underwent CT angiography of the head and neck in Beihai People's Hospital from January 2020 to May 2022 were included in this study.Patients were divided into three groups according to different tube voltages:group A(tube voltage 120 kV,n=45),group B(tube voltage 100 kV,n=45)and group C(tube voltage 80 kV,n=30).Patients in group A were divided into group A1(<70 kg,n=15),group A2(70-85 kg,n=15)and group A3(>85 kg,n=15)according to different body weights.Patients in group B were divided into group B1(<70 kg,n=15),group B2(70-85 kg,n=15)and group B3(>85 kg,n=15)according to different body weights.Patients in group C were divided into group C1(<70 kg,n=15)and group C2(70-85 kg,n=15)according to different body weights.Group C3 was not used.The contrast medium used was Loversol.The CT value,image noise,signal-to-noise ratio,contrast to noise ratio,and effective radiation dose of arterial vessels in each group were measured.The images were subjectively evaluated by two physicians who had senior professional titles using a 5-point rating scale.Results Subjective score of image quality was all≥3 grade in each group.There was no significant difference in image quality rating between groups A1 and A2 and groups B1,B2,and C1.There was a remarkable difference in image quality rating between groups A3,B3,and C2 and the other groups.There was a significant difference in the CT value of blood vessels at four different levels between groups A1,B1 and C1(F=76.82,64.62,98.79,71.85,all P<0.001).There was a significant difference in CT value of blood vessels at four different levels between groups A2,B2 and C2(F=159.82,112.33,108.22,135.18,all P<0.001).There was a significant difference in CT value of blood vessels at four different levels between groups A3 and B3(t=4.40,4.27,3.91,3.59,all P<0.05).In groups B3 and C2,the imag

关 键 词：计算机体层摄影血管造影术 血管疾病 头颈部 人体质量指数 体重与身体测量 辐射剂量 图像处理 计算机辅助 管电压 

分 类 号：R816.1[医药卫生—放射医学]