Relationship between assistant's lens exposure and dose information during computed tomography examinations.

IF 1.4 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
Hajime Ito, Kosuke Matsubara, Ikuo Kobayashi, Yurie Shimakawa, Daichi Murayama, Takayuki Sakai, Tomonori Isobe, Noriyuki Yanagawa, Shigehiro Ochi
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Abstract

According to International Commission of Radiological Protection, the equivalent dose limit for the eye lens for occupational exposure is recommended to be 20 mSv yr-1, averaged over 5 years, with no single year above 50 mSv. Some studies reported the measurement of assistant's lens exposure in diagnostic computed tomography (CT) examinations, but further investigation is still required in the association between the lens dose for assistants and various dose parameters. Therefore, we measured the assistant's lens exposure using small optically stimulated luminescence dosimeters. The type of occupation, type of assistance, total scan time, total mAs, total scan length, and dose-length product (DLP) were recorded and analyzed in association with air kerma at the lens position. The assistance was classified into four types: 'assisted ventilation,' 'head holding,' 'body holding,' and 'raising patient's arm.' The air kerma of lens position was not significantly different for each assistance type (p< 0.05, Kruskal-Wallis test). Further, the lens doses for assistants correlated with DLP, but with various strengths of correlation with the assistance type and were influenced by the distance from the CT gantry. In conclusion, lens dose during assistance and DLP demonstrated the strongest correlation. 'Raising patient's arm' and 'head holding' exhibited stronger correlations, which required less table movement during the CT scan than 'assisted ventilation' and 'body holding'.

计算机断层扫描检查过程中助手的镜头暴露与剂量信息之间的关系。
根据国际辐射防护委员会的建议,职业性暴露于眼球晶状体的当量剂量限值为 20 毫希沃特/年,5 年的平均值为 50 毫希沃特/年,任何一年都不能超过 50 毫希沃特。一些研究报告称,在计算机断层扫描(CT)诊断检查中测量了助手的镜片暴露量,但仍需进一步研究助手的镜片剂量与各种剂量参数之间的关联。因此,我们使用小型光刺激发光剂量计测量了助手的镜片暴露量。我们记录并分析了职业类型、辅助类型、总扫描时间、总 mAs、总扫描长度和剂量-长度乘积(DLP)与镜片位置处空气珍珠层的关联。辅助分为四种类型:"辅助通气"、"头部固定"、"身体固定 "和 "抬起患者手臂"。每种辅助类型的镜片位置空气切迹均无明显差异(P < 0.05,Kruskal-Wallis 检验)。此外,辅助人员的镜片剂量与 DLP 相关,但与辅助类型的相关性强弱不一,并且受到与 CT 机架距离的影响。总之,辅助过程中的镜头剂量与 DLP 的相关性最强。与 "辅助通气 "和 "扶住身体 "相比,"抬起病人手臂 "和 "扶住头部 "的相关性更强,在 CT 扫描期间所需的工作台移动更少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Radiological Protection
Journal of Radiological Protection 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
2.60
自引率
26.70%
发文量
137
审稿时长
18-36 weeks
期刊介绍: Journal of Radiological Protection publishes articles on all aspects of radiological protection, including non-ionising as well as ionising radiations. Fields of interest range from research, development and theory to operational matters, education and training. The very wide spectrum of its topics includes: dosimetry, instrument development, specialized measuring techniques, epidemiology, biological effects (in vivo and in vitro) and risk and environmental impact assessments. The journal encourages publication of data and code as well as results.
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