“三低剂量”扫描在头颈CT血管成像检查中的应用价值  

The application value of"three low dose"scanning in head and neck CTA examination

作　　者：张芳 张磊[1] 汝海燕 王晓峰 任千里 赵伟 ZHANG Fang;ZHANG Lei;RU Hai-Yan(Department of Medical Imaging,Huaibei People′s Hospital directly under Bengbu Medical College,Huaibei 235000,Anhui,China)

机构地区：[1]蚌埠医学院直属淮北市人民医院影像科,安徽淮北235000

出　　处：《吉林医学》2024年第7期1544-1548,共5页Jilin Medical Journal

基　　金：淮北市市级科技计划项目[项目编号:2022HK001]。

摘　　要：目的:探讨“三低剂量”扫描在头颈CT血管成像(CTA)中的应用价值。方法:选取2022年9月~2023年4月淮北市人民医院行头颈CTA检查18.5 kg/m^(2)≤体重指数(BMI)<30 kg/m^(2)的120例患者为研究对象,随机分成A组与B组各60例。其中A组采用常规扫描,B组采用低管电压、低对比剂、低流速注射扫描。扫描完成后,对图像质量进行主观评分和客观评价。在头颈CTA图像上测量主动脉弓(OAR),左、右颈总动脉(L/R CCA),左、右颈内动脉(L/R IC),左、右大脑中动脉M1段(L/R MC)的CT值及图像噪声(SD值),计算各部位的信号噪声比(SNR)和对比噪声比(CNR),记录有效辐射剂量(ED)。并对图像质量进行主观评价和对各组测量、计算结果进行统计学分析。结果:两组血管整体评分比较差异无统计学意义(P>0.05)。两组OAR处CT值比较差异有统计学意义(P<0.05)。两组L/R CCA、L/R IC、L/R MC的CT值比较差异无统计学意义(P>0.05)。两组的SNR及CNR进行比较,差异无统计学意义(P>0.05)。两组总体剂量长度乘积(DLP)值比较,差异有统计学意义(P<0.05)。两组ED值比较,差异有统计学意义(P<0.05)。结论:当18.5 kg/m^(2)≤BMI<30 kg/m^(2),“三低剂量”扫描可满足诊断要求,减低辐射剂量,降低对比剂的不良影响,增加患者的依从性。Objective To investigate the application value of"three low dose"scanning in head and neck CT angiography(CTA).Method A total of 120 patients who underwent head and neck CTA examination of 18.5 kg/m^(2)≤BMI<30 kg/m^(2) from September 2022 to April 2023 were collected as research subjects,and they were divided into group A and group B by simple random method,with 60 patients in each group.Group A was scanned conventionally,group B was scanned by injection with low tube voltage,low contrast agent and low flow rate.After scanning,the image quality was evaluated subjectively and objectively.The CT values and image noise(SD value)of aortic arch(OAR),left and right common carotid artery(L/R CCA),left and right internal carotid artery(L/R IC),left and right middle cerebral artery M1 segment(L/R MC)were measured on head and neck CTA images,and the signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)of each location were calculated.The effective radiation dose(ED)was recorded.The image quality was evaluated subjectively and the results of measurement and calculation were analyzed statistically.Results There was no significant difference in overall vascular scores between group A and group B(P>0.05).The CT value of aortic arch(OAR)in group A was significantly different from that in group B(P<0.05).The CT values of left and right common carotid artery(L/R CCA),left and right internal carotid artery(L/R IC),and left and right middle cerebral artery M1 segment(L/R MC)were not significantly different between group A and group B(P>0.05).There was no significant difference in SNR and CNR among all groups(P>0.05).There was a statistically significant difference in DLP of group A and group B(P<0.05).There was a statistically significant difference in the ED value of group A and group B(P<0.05).Conclusion When 18.5 kg/m^(2)≤BMI<30 kg/m^(2),the"three low dose"scan can meet the diagnostic requirements,reduce the radiation dose,reduce the adverse effects of contrast agents,and increase the patient compliance.

关 键 词：扫描模式 头颈CT血管成像 体层摄影术 图像质量 辐射剂量 

分 类 号：R445[医药卫生—影像医学与核医学]