摘要
探究自动管电流调制技术下胸部CT中体外异物对辐射剂量的影响,分析定位像重扫的必要性。采集历史数据,将数据分为有异物组和无异物组。用倾向性评分匹配法平衡受检者性别、检查年龄、图像层数、扫描床高度以及受检者平均横截面积5个协变量。配平后,分析异物对容积CT剂量指数(CTDI_(vol))和剂量长度乘积(DLP)的影响,比较剂量增量与定位像剂量的差异。研究纳入17 342例数据,处理组4 740例(27.3%)。匹配前,处理组5个协变量均低于对照组;匹配获得3 944对均衡样本,5个协变量在两组间无差异,处理组CTDI_(vol)和DLP略高于对照组。体外异物可导致辐射剂量微小增加,但其增量与定位像剂量无差异。操作人员可根据具体情况灵活决定是否需要重扫定位像。
To investigate the effect of external foreign bodies on radiation dose during chest computed tomography(CT)scans under automatic tube current-modulation technology and to assess the necessity of re-scanning a scout image,we retrospectively categorize historical data into foreign body and non-foreign body cohorts.Propensity score matching is employed to balance five covariates:patient gender,examination age,number of image layers,scanning-bed height,and average cross-sectional area of patients.After balancing,we statistically analyze the effect of foreign bodies on the volume CT dose index(CTDI_(vol))and dose-length product(DLP),and compare the dose increment with the scout-image dose.The study includes 17342 cases,with 4740 cases(27.3%)in the treatment group.Before matching,all five covariates in the treatment group are significantly lower than those in the control group.After matching,3944 pairs of balanced samples are obtained and no significant differences are observed between the two groups in the five covariates.The treatment group shows slightly higher CTDI_(vol) and DLP values compared with the control group.External foreign bodies can slightly increase the radiation dose,although the incremental dose does not differ statistically from that of the scout image.Operators should flexibly determine whether to re-scan the scout image based on specific clinical circumstances.
作者
胡艳军
魏璇
张禹
田心
王丽坤
江桂莲
牛延涛
HU Yanjun;WEI Xuan;ZHANG Yu;TIAN Xin;WANG Likun;JIANG Guilian;NIU Yantao(Department of Radiology,Beijing Friendship Hospital,Capital Medical University,Beijing 100050,China)
出处
《CT理论与应用研究(中英文)》
2025年第5期898-903,共6页
Computerized Tomography Theory and Applications
关键词
倾向性评分匹配法
自动管电流调制技术
胸部CT
定位像
体外异物
辐射剂量
propensity score matching
automatic tube current modulation
thoracic computed tomography
scout view
external foreign body
radiation dose
