器官剂量调制技术在双下肢CT血管造影中的应用  

Application of organ dose modulation technique in CTA for both lower extremities

作　　者：李然 袁颖[1] 徐辉 原媛[1] 江桂莲[1] Li Ran;Yuan Ying;Xu Hui;Yuan Yuan;Jiang Guilian(Department of Radiology,Beijing Friendship Hospital,Capital Medical University,Beijing 100050,China)

机构地区：[1]首都医科大学附属北京友谊医院放射科,北京100050

出　　处：《中国医学装备》2025年第3期1-4,共4页China Medical Equipment

基　　金：科技部重点研发计划(2022YFC2409403)。

摘　　要：目的:探讨在双下肢动脉CT血管造影(CTA)中应用器官剂量调制(ODM)技术对辐射剂量及图像质量的影响。方法:回顾性选取2024年3月至6月于首都医科大学附属北京友谊医院接受双下肢CTA检查的60例疑似下肢动脉闭塞患者,采取随机数表法将其分为ODM组和非ODM组,每组30例,所有患者均行CTA检查,扫描参数相同,记录两组患者盆腔区域(前、左、后、右)4个方向的管电流,测量盆腔区域股动脉和髂外动脉各感兴趣区域(ROI)的CT值、SD值、容积CT剂量指数(CTDI_(vol))和剂量-长度乘积(DLP),并对图像质量进行主观评分。结果:ODM组在盆腔前方的管电流为(109.17±35.62)mA,较非ODM组的(185.58±55.38)mA下降42%,差异有统计学意义(t=-4.781,P<0.05);两组患者CTDI_(vol)、DLP、盆腔区域股动脉和髂外动脉CT值及信噪比(SNR)比较,差异均无统计学意义(P>0.05)。两组图像质量主观评分均≥4分,差异无统计学意义(P>0.05)。结论:ODM技术用于双下肢CTA检查中,在确保图像质量的同时可对表层性腺器官起到保护作用;ODM技术在双下肢CTA中降低盆腔区域辐射剂量的应用具有可行性,能够实现辐射防护的优化原则。Objective:To investigate the effect of organ dose modulation(ODM)technique on radiation dose and image quality in computed tomography angiography(CTA)for arteries of both lower extremities.Methods:A total of sixty patients with suspected lower extremity arterial occlusion who underwent CTA examination on both lower extremities at Beijing Friendship Hospital affiliated to Capital Medical University from March 2024 to June 2024 were selected.They were randomly divided into an ODM group and a non-ODM group,with 30 patients in each group.All patients underwent CTA examination with the same scanning parameters.The tube currents in the pelvic region,which included 4 directions(anterior,left,posterior and right),of two groups of patients were recorded,and the CT values,SD values,volumetric CT dose index(CTDI_(vol))and dose-length product(DLP)of femoral artery and external iliac artery of the regions of interest(ROI)in the pelvic region were respectively measured,and the image quality of them was analyzed by subjective scores.Results:The tube current in front of the pelvic cavity was(109.17±35.62)mA in ODM group,which decreased by 42%than(185.58±55.38)mA in non-ODM group,and the difference was statistically significant(t=-4.781,P<0.05).There were no statistically significant differences in CTDI_(vol) values,DLP values,and CT values and signal noise ratio(SNR)of femoral artery and external iliac artery of the regions of interest(ROI)in the pelvic region between two groups(P>0.05).The subjective scores for image quality of two groups were≥4 points,and there was not statistically significant difference in that between two groups(P>0.05).Conclusion:The application of ODM technique in CTA examination for both lower extremities can realize protective function for surface gonadal organs when ensures image quality,which can meet the needs of clinical diagnosis.It has clinical application value.

关 键 词：双下肢CT血管造影(CTA) 器官剂量调节(ODM) 辐射敏感器官 

分 类 号：R814.2[医药卫生—影像医学与核医学]