Is It Appropriate to Completely Eliminate Contact Shielding during CT Examination? A Discourse Based on Experimental Findings.

IF 1 4区 医学 Q4 ENVIRONMENTAL SCIENCES Health physics Pub Date : 2024-01-01 Epub Date: 2023-10-04 DOI:10.1097/HP.0000000000001742
Jiwei Chen, Jianchun Tu, Shengyan Huang, Zhenhua Zhu, Yu Tu
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Abstract

Objective: Through the integration of experimental data and literature, this study examines whether complete elimination of contact shielding during CT examination is warranted, with a particular focus on potential impacts to children's thyroid and pregnant women, as well as limitations associated with contact shielding. Methods: The thermoluminescent dosimeter (TLD) tablets were inserted into the phantom's five organs and tissues. Select fixed exposure, automatic exposure control (AEC), and use contact shielding combined into four experimental modes, with scanning of the phantom's four parts. Obtain the absorbed dose measurements within or outside the FOV. Statistical analysis was conducted using SPSS software. Results: (1) The AEC significantly reduces dose within and outside the FOV, with a dose reduction of 40%-60%. (2) The application of contact shielding outside the FOV significantly reduced the dose adjoin the FOV. (3) Both the use of AEC mode and contact shielding can effectively minimize the dose, with a reduction of 50-80%. (4) The shielding within the FOV may introduce image artifacts or interfere with AEC, the implementation of contact shielding outside FOV provides little reduction in radiation exposure risk through previous literature. (5) Contact shielding exhibits certain drawbacks in all aspects. Conclusion: The utilization of AEC mode in clinical CT should be widely adopted to minimize patient radiation exposure. In general, contact shielding both inside and outside the FOV should be avoided during exposure. However for children under 12 years old with thyroid gland examination, contact shielding could maximally reduce external radiation and may be appropriate. Pregnant women require careful evaluation when considering the use of contact shielding. Contact shielding should not be entirely abandoned.

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在CT检查中完全消除接触屏蔽是否合适?基于实验发现的话语。
目的:通过整合实验数据和文献,本研究考察了在CT检查中是否有必要完全消除接触屏蔽,特别关注对儿童甲状腺和孕妇的潜在影响,以及与接触屏蔽相关的限制。方法:将热释光剂量计(TLD)片插入体模的五个器官和组织中。选择固定曝光、自动曝光控制(AEC)和使用接触屏蔽组合成四种实验模式,扫描体模的四个部分。获取视场内外的吸收剂量测量值。采用SPSS软件进行统计分析。结果:(1)AEC显著降低了FOV内外的剂量,剂量降低了40%-60%。(2) FOV外部接触屏蔽的应用显著降低了FOV附近的剂量。(3) AEC模式和接触屏蔽的使用都可以有效地将剂量降至最低,减少50-80%。(4) FOV内的屏蔽可能会引入图像伪影或干扰AEC,通过先前的文献,FOV外接触屏蔽的实施几乎没有降低辐射暴露风险。(5) 接触屏蔽在所有方面都表现出某些缺点。结论:临床CT应广泛采用AEC模式,以尽量减少患者的辐射暴露。一般来说,在暴露期间应避免FOV内外的接触屏蔽。然而,对于12岁以下进行甲状腺检查的儿童,接触屏蔽可以最大限度地减少外部辐射,这可能是合适的。孕妇在考虑使用接触屏蔽时需要仔细评估。不应完全放弃接触屏蔽。
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
Health physics
Health physics 医学-公共卫生、环境卫生与职业卫生
CiteScore
4.20
自引率
0.00%
发文量
324
审稿时长
3-8 weeks
期刊介绍: Health Physics, first published in 1958, provides the latest research to a wide variety of radiation safety professionals including health physicists, nuclear chemists, medical physicists, and radiation safety officers with interests in nuclear and radiation science. The Journal allows professionals in these and other disciplines in science and engineering to stay on the cutting edge of scientific and technological advances in the field of radiation safety. The Journal publishes original papers, technical notes, articles on advances in practical applications, editorials, and correspondence. Journal articles report on the latest findings in theoretical, practical, and applied disciplines of epidemiology and radiation effects, radiation biology and radiation science, radiation ecology, and related fields.
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