Wide cone beam CT dosimetry: Analysis of results and uncertainty evaluation

IF 1.6 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY

Radiation Measurements Pub Date : 2024-08-10 DOI:10.1016/j.radmeas.2024.107266

Fillipe M. de Jesus , Luciana T. Campos , Simone K. Renha , Priscila M.D.S. Dias , Leonardo D.C. Pacífico , Samara C.F. Machado , Vitor M. Sardenberg , Ricardo T. Lopes , Luís A.G. Magalhães

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引用次数: 0

Abstract

Objective

To investigate the consistency of the recommended methodology, we analyzed the dosimetric results obtained for each setup beam shaping filter and tube voltage and evaluated the uncertainty associated with the full dose measurement process.

Methods

A 300-mm PTIC was used to validate the results obtained with the 100-mm PTIC. Considering the other dosimetric parts, a cylindrical 160-mm diameter PMMA phantom and a cylindrical 320-mm diameter PMMA phantom were also used in the experimental protocol.

Results

For the lowest and highest tube voltages available, the CTDI_air,160 values obtained by 1-step dosimetry with the 300-mm PTIC were greater than the respective values obtained by 2- and 3-step dosimetry with the 100-mm PTIC.

Conclusion

This study established that careful positioning of the 100-mm PTIC in 2 or 3 steps, as well as proper execution of the other dosimetric parts recommended by the IAEA, represents a validated approach within up to 20% uncertainty for wide cone beam CT dosimetry.

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宽锥束 CT 剂量测定：结果分析和不确定性评估

为了研究推荐方法的一致性，我们分析了每种设置光束整形滤波器和管电压的剂量测定结果，并评估了与整个剂量测定过程相关的不确定性。考虑到其他剂量测定部分，实验方案中还使用了一个直径为 160 毫米的圆柱形 PMMA 假体和一个直径为 320 毫米的圆柱形 PMMA 假体。结果在可用的最低和最高管电压下，使用 300 毫米 PTIC 进行 1 步剂量测定所获得的 CTDIair,160 值均大于使用 100 毫米 PTIC 进行 2 步和 3 步剂量测定所获得的相应值。结论这项研究证实，将 100 毫米 PTIC 分两步或三步仔细定位，并正确执行 IAEA 建议的其他剂量测定部分，是一种经过验证的宽锥束 CT 剂量测定方法，其不确定性最高可达 20%。

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 Measurements 工程技术-核科学技术

CiteScore

4.10

自引率

20.00%

发文量

116

审稿时长

48 days

期刊介绍： The journal seeks to publish papers that present advances in the following areas: spontaneous and stimulated luminescence (including scintillating materials, thermoluminescence, and optically stimulated luminescence); electron spin resonance of natural and synthetic materials; the physics, design and performance of radiation measurements (including computational modelling such as electronic transport simulations); the novel basic aspects of radiation measurement in medical physics. Studies of energy-transfer phenomena, track physics and microdosimetry are also of interest to the journal. Applications relevant to the journal, particularly where they present novel detection techniques, novel analytical approaches or novel materials, include: personal dosimetry (including dosimetric quantities, active/electronic and passive monitoring techniques for photon, neutron and charged-particle exposures); environmental dosimetry (including methodological advances and predictive models related to radon, but generally excluding local survey results of radon where the main aim is to establish the radiation risk to populations); cosmic and high-energy radiation measurements (including dosimetry, space radiation effects, and single event upsets); dosimetry-based archaeological and Quaternary dating; dosimetry-based approaches to thermochronometry; accident and retrospective dosimetry (including activation detectors), and dosimetry and measurements related to medical applications.