Monte Carlo simulations of organ and effective doses and dose-length product for dental cone-beam CT.

IF 1.6 3区医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Oral Radiology Pub Date : 2024-01-01 Epub Date: 2023-08-19 DOI:10.1007/s11282-023-00705-7

Shingo Terashima, Junta Sano, Minoru Osanai, Keisuke Toshima, Kentaro Ohuchi, Yoichiro Hosokawa

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Abstract

Objectives: The use of dental cone-beam CT (CBCT) has increased in recent years. We aimed to calculate the organ and effective doses in dental CBCT using Monte Carlo simulation (MCS) and to correlate the effective dose with the dose-length product (DLP), which is a radiation dose index.

Methods: Organ and effective doses were calculated by MCS using the adult male and female reference phantoms of the International Commission on Radiological Protection publication 110 in a half-rotation scan of the CBCT scanner Veraviewepocs 3Df. The simulations were performed by setting nine protocols in combination with the field-of-view (FOV) and imaging region. In addition, DLPs were calculated by MCS using the virtual CT Dose Index (CTDI) and CBCT phantoms, with the same protocol.

Results: The effective doses were 55 and 195 μSv at the minimum FOV of Φ40 × H40 mm and maximum FOV of Φ 80 × H80 mm, respectively. The organs with the major contribution to the effective dose were the red bone marrow (11.0‒12.8%), thyroid gland (4.0‒12.7%), salivary gland (21.8‒33.2%), and remaining tissues (35.1‒45.7%). Positive correlations were obtained between the effective dose and calculated DLP using the CTDI and CBCT phantoms.

Conclusions: Organ and effective doses for each protocol of dental CBCT could be estimated using MCS. There was a positive correlation between the effective dose and DLP, suggesting that DLP can be used to estimate the effective dose of CBCT.

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蒙特卡罗模拟牙科锥形束 CT 的器官和有效剂量以及剂量-长度乘积。

目的：近年来，牙科锥形束 CT（CBCT）的使用越来越多。我们旨在使用蒙特卡罗模拟（MCS）计算牙科锥束 CT 的器官剂量和有效剂量，并将有效剂量与作为辐射剂量指数的剂量-长度乘积（DLP）相关联：方法：使用国际放射防护委员会出版物 110 中的成年男性和女性参考模型，在 CBCT 扫描仪 Veraviewepocs 3Df 的半旋转扫描中，通过 MCS 计算器官剂量和有效剂量。模拟是通过结合视场（FOV）和成像区域设置九种协议进行的。此外，MCS 还利用虚拟 CT 剂量指数（CTDI）和 CBCT 模型计算了 DLP，并采用了相同的方案：在最小 FOV Φ40 × H40 mm 和最大 FOV Φ 80 × H80 mm 时，有效剂量分别为 55 和 195 μSv。对有效剂量贡献最大的器官是红骨髓（11.0-12.8%）、甲状腺（4.0-12.7%）、唾液腺（21.8-33.2%）和其他组织（35.1-45.7%）。使用 CTDI 和 CBCT 模型计算的有效剂量和 DLP 之间呈正相关：使用 MCS 可以估算出牙科 CBCT 各方案的器官剂量和有效剂量。有效剂量和 DLP 之间呈正相关，表明 DLP 可用于估算 CBCT 的有效剂量。

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

Oral Radiology DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

4.20

自引率

13.60%

发文量

审稿时长

>12 weeks

期刊介绍： As the official English-language journal of the Japanese Society for Oral and Maxillofacial Radiology and the Asian Academy of Oral and Maxillofacial Radiology, Oral Radiology is intended to be a forum for international collaboration in head and neck diagnostic imaging and all related fields. Oral Radiology features cutting-edge research papers, review articles, case reports, and technical notes from both the clinical and experimental fields. As membership in the Society is not a prerequisite, contributions are welcome from researchers and clinicians worldwide.