Monte Carlo simulation study of the effect of thyroid shielding on radiation dose in dental cone beam CT in an adult male phantom.

IF 0.8 4区环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES

Radiation protection dosimetry Pub Date : 2024-12-06 DOI:10.1093/rpd/ncae206

Guolin Chen, Yuchen Yin, Liang Sun, Zichun Tang, Jianguo Chen

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引用次数: 0

Abstract

In this paper, the effect of thyroid collars on radiation dose during dental cone-beam computed tomography (CBCT) was evaluated using Monte Carlo simulations and to calculate the effective dose underestimated for the actual CBCT examination due to accounting only for the head and neck. Three thyroid collar models that covered the surface of the phantom were established according to the International Commission on Radiological Protection (ICRP) adult-male mesh-type reference computational phantoms, and a Particle and Heavy Ion Transport code System was used to calculate the equivalent and effective doses of ICRP phantom when different thyroid shielding protocols were used in NewTom VGi evo CBCT, considering one medium (12 × 8 cm) and one small (8 × 5 cm) fields of view (FOVs), and two centre positions were used for each FOV. In four CBCT scanning scenarios, thyroid shielding reduced the equivalent dose for many tissues. The results indicate that the portion of the thyroid collar that wraps around the neck has the main role in reducing the effective dose during dental CBCT examinations, and the higher the axial level of the top of the shielding, the better the effectiveness of the shielding. In this study, the underestimation of the effective dose due to considering only the head and neck was 3.1%-8.1%, and the underestimation was more pronounced in larger FOVs.

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甲状腺屏蔽对成年男性模型牙科锥形束 CT 辐射剂量影响的蒙特卡罗模拟研究。

本文采用蒙特卡洛模拟法评估了甲状腺衣领对牙科锥束计算机断层扫描（CBCT）过程中辐射剂量的影响，并计算了实际 CBCT 检查中因只考虑头颈部而低估的有效剂量。根据国际辐射防护委员会（ICRP）的成年男性网格型参考计算模型，建立了三个覆盖模型表面的甲状腺衣领模型、并使用粒子和重离子传输代码系统计算了在 NewTom VGi evo CBCT 中使用不同甲状腺屏蔽方案时 ICRP 模型的等效剂量和有效剂量，考虑了一个中视场（12 × 8 厘米）和一个小视场（8 × 5 厘米），每个视场使用两个中心位置。在四种 CBCT 扫描方案中，甲状腺屏蔽降低了许多组织的等效剂量。结果表明，在牙科 CBCT 检查中，甲状腺环绕颈部的部分在减少有效剂量方面起主要作用，屏蔽顶部的轴向水平越高，屏蔽效果越好。在这项研究中，仅考虑头颈部导致的有效剂量低估率为 3.1%-8.1%，在较大的 FOV 中低估率更为明显。

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

Radiation protection dosimetry 环境科学-公共卫生、环境卫生与职业卫生

CiteScore

1.40

自引率

10.00%

发文量

223

审稿时长

6-12 weeks

期刊介绍： Radiation Protection Dosimetry covers all aspects of personal and environmental dosimetry and monitoring, for both ionising and non-ionising radiations. This includes biological aspects, physical concepts, biophysical dosimetry, external and internal personal dosimetry and monitoring, environmental and workplace monitoring, accident dosimetry, and dosimetry related to the protection of patients. Particular emphasis is placed on papers covering the fundamentals of dosimetry; units, radiation quantities and conversion factors. Papers covering archaeological dating are included only if the fundamental measurement method or technique, such as thermoluminescence, has direct application to personal dosimetry measurements. Papers covering the dosimetric aspects of radon or other naturally occurring radioactive materials and low level radiation are included. Animal experiments and ecological sample measurements are not included unless there is a significant relevant content reason.