Comparative evaluation of absorbed doses in silver wedge-filter-based chest CT versus chest radiography: A Monte Carlo study

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2025-08-29 DOI:10.1016/j.radphyschem.2025.113274

Yusei Nishihara , Masanao Kobayashi , Akari Satake , Tsuzuki Tadasuke , Rei Ito , Tomonobu Haba , Shigeki Kobayashi

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Abstract

In the silver (Ag) wedge-filter-fitted computed tomography (CT) scanner, we estimated organ doses during chest CT examinations and chest radiography to assess the Ag-filter-based dose reduction in six scan protocols for chest CT: three conventional protocols with standard filters (clinical standard, low-dose, and ultra-low-dose) and three corresponding Ag-filter-based protocols; the tube current was adjusted to maintain similar standard deviations (SD) and two protocols for chest radiography: posteroanterior (PA) projection (medical checkups) and posteroanterior with right-left (PA + RL) projection (clinical protocols). Using the Monte Carlo simulation software (ImpactMC), we estimated absorbed doses by simulating photon transport in computational phantoms (adult males and females) based on average values for organ doses (lungs, breast tissue, heart, stomach, and liver) and the maximum value for the skin dose. Despite similar SD, the organ and tissue doses in the Ag filter-based ultra-low-dose chest CT protocol (vs. no-Ag filter) were lower for females: skin (39.6 %), lung (17.4 %), breast tissue (20.1 %), heart (16.5 %), stomach (14.4 %), and liver (16.7 %), with similar dose reductions across other scan protocols. In the ultra-low-dose Ag-filter-based chest CT protocol, the absorbed doses resembled those of PA + RL radiography (clinical protocol). During chest CT examinations, the Ag filter-based effective reduction of the radiation dose conferred a potentially significant impact on the risk–benefit balance in CT-based lung cancer screening; this potentially influences the screening targets and overall effectiveness. By balancing radiation risk and diagnostic benefits, the Ag filter facilitates a paradigm shift from radiography to ultra-low-dose CT examinations in conventional diagnosis and follow-up.

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基于银楔滤片的胸部CT与胸部x线摄影吸收剂量的比较评价：一项蒙特卡洛研究

在装有银（Ag）楔形过滤器的计算机断层扫描（CT）扫描仪中，我们估计了胸部CT检查和胸部x线摄影期间的器官剂量，以评估六种胸部CT扫描方案中基于银过滤器的剂量减少：三种使用标准过滤器的常规方案（临床标准、低剂量和超低剂量）和三种相应的基于银过滤器的方案；调整管电流以保持相似的标准偏差（SD）和两种胸片方案：后前位（PA）投影（医学检查）和后前位右左（PA + RL）投影（临床方案）。使用蒙特卡罗模拟软件（ImpactMC），我们根据器官剂量（肺、乳房组织、心脏、胃和肝脏）的平均值和皮肤剂量的最大值，通过模拟计算幻影（成年男性和女性）中的光子传输来估计吸收剂量。尽管SD相似，但在基于银过滤器的超低剂量胸部CT方案中（与无银过滤器相比），女性的器官和组织剂量更低：皮肤（39.6%）、肺（17.4%）、乳房组织（20.1%）、心脏（16.5%）、胃（14.4%）和肝脏（16.7%），其他扫描方案的剂量降低幅度相似。在超低剂量ag滤片胸部CT方案中，吸收剂量与PA + RL x线摄影（临床方案）相似。在胸部CT检查中，基于银滤器的有效降低辐射剂量对基于CT的肺癌筛查的风险-收益平衡具有潜在的显著影响；这可能会影响筛查目标和整体有效性。通过平衡辐射风险和诊断益处，Ag过滤器促进了常规诊断和随访中从x线摄影到超低剂量CT检查的范式转变。

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.