CT理论与应用研究2025，Vol.34Issue(3)：345-350,6.DOI:10.15953/j.ctta.2024.318
颅脑CT扫描中不同基线下铋屏蔽以及器官剂量调制技术的应用
Application of Bismuth Shielding and Organ Dose Modulation Techniques in Brain CT Scanning with Different Scanning Baselines
任悦 1张永县 1刘丹丹 1马文涛 1郭森林1
作者信息
- 1. 首都医科大学附属北京同仁医院放射科,北京 100730
- 折叠
摘要
Abstract
Objective:To investigate the effects of bismuth shielding and organ dose modulation(ODM)on image quality and lens radiation dose in brain computed tomography(CT)with different scanning baselines.Methods:GE(General Electric Company)Revolution CT was used to scan isolated skull specimens,with the glabellomeatal and orbitomeatal lines established as the scanning baselines.The volume CT dose index(CTDIvol)remained constant.Four scanning methods were adopted as follows:fixed mA,fixed mA combined with bismuth shielding,ODM,and ODM combined with bismuth shielding.The lens radiation dose for each scan was measured using a dosimeter.CT values and image noise levels were measured in the left cerebellum,temporal lobe of the brain,and left adipose body of the orbit.Results:The lens dose was highest when the baseline was the orbitomeatal line with a fixed mA(43.49mGy),while the dose was lowest when the baseline was the glabellomeatal line with ODM combined with bismuth shielding(14.81mGy).The CT values and image noise levels in the adipose body of the orbit increased when bismuth shielding and ODM combined with bismuth shielding were used.No significant difference was observed in image quality among the other groups.Conclusion:The organ dose of the eye lens could be reduced using the glabellomeatal line,and bismuth shielding combined with ODM were used for brain CT.However,the image quality of the intraorbital soft tissue might be decreased.In clinical practice,appropriate scanning methods can be used according to different patient conditions and diagnostic requirements.关键词
CT/铋屏蔽/器官剂量调制技术/眼晶状体/辐射剂量Key words
CT/bismuth shielding/organ dose modulation/eye lens/radiation dose分类
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任悦,张永县,刘丹丹,马文涛,郭森林..颅脑CT扫描中不同基线下铋屏蔽以及器官剂量调制技术的应用[J].CT理论与应用研究,2025,34(3):345-350,6.
