医学信息2025，Vol.38Issue(18)：42-46,5.DOI:10.3969/j.issn.1006-1959.2025.18.009
基于BMI的正位定位像技术在个性化低剂量CT肺结节筛查中应用价值
Application Value of BMI-based Anteroposterior Positioning Technology in Personalized Low-dose CT Screening for Lung Nodule
摘要
Abstract
Objective To investigate the application value of BMI-based anteroposterior positioning technology in personalized low-dose CT screening for lung nodules.Methods From September to November 2023,patients who underwent low-dose CT screening for lung nodules in our hospital were randomly divided into two groups for chest low-dose CT examination by using the random number table,with 112 patients in each group.Group A was the conventional low-dose group,using a tube voltage of 110 kV,automatic tube current technology,with a fixed reference of 50 mA,and positioning via conventional chest CT scan(positioning method from the lung apex to the lung base).Group B was the personalized low-dose group,using a tube voltage of 110 kV,automatic tube current technology,with a reference range of 40-60 mA,and the tube current was adjusted based on the BMI of the subjects to provide corresponding scan doses.Group B was further divided into B1 and B2 subgroups based on different positioning methods.Group B1 used conventional chest CT scan positioning(from the lung apex to the lung base),while group B2 used BMI-based anteroposterior positioning for personalized positioning:for subjects with BMI ≥20.85 kg/m2,the scan range was from the upper margin of the T,vertebral spinous process to the lower margin of the T12 vertebral spinous process;for subjects with BMI＜20.85 kg/m2,the scan range was from the upper margin of the T1 vertebral spinous process to the lower margin of the L1 vertebral spinous process.Subjective and objective evaluation methods were used to analyze the images,and various indexes[volumetric CT dose index(CTDIvol),dose-length product(DLP),and effective dose(ED)]of radiation dose in groups A and B were calculated.The number of 1mm thin-slice images without excessive scanning of lung tissue at the lung base was also compared between groups B1 and B2.Results The CTDI,DLP and ED indexes of group B were lower than those of group A(P＜0.05).The consistency of image quality evaluation by two senior doctors was good(Kappa=0.701),and all image quality scores were 3 scores or more,which could meet the diagnostic requirements.The subjective score of group A was(4.42±0.49)scores,and that of group B was(4.51±0.53)scores,but there was no significant difference between the two groups(P＞0.05).There were no significant differences in lung SNR,lung-air CNR,aortic SNR and aortic-erector spinae CNR between groups A and B(P＞0.05).The number of 1 mm image layers without lung tissue in group B1 was(29±18)layers,which was more than(17±12)layers in group B2,and the difference was statistically significant(P＜0.05).Conclusion BMI-based anteroposterior positioning technology can effectively complete lung nodule screening in personalized low-dose CT screening,satisfying diagnostic needs,effectively reducing radiation dose,reducing excessive scanning,achieving personalized screening without affecting image quality.关键词
肺结节/辐射剂量/低剂量螺旋CT/体重指数Key words
Lung nodule/Radiation dose/Low-dose spiral CT/body mass index分类
医药卫生引用本文复制引用
周国华,李建伟,沈海平,邵国华,李浩,王刚..基于BMI的正位定位像技术在个性化低剂量CT肺结节筛查中应用价值[J].医学信息,2025,38(18):42-46,5.基金项目
东莞市科技特派员项目(编号:20221800500222) （编号:20221800500222）
