用于放射治疗运动管理质量保证的动态拟人胸廓模型

IF 3.4 Q2 ONCOLOGY
Sara Abdollahi , Ali Asghar Mowlavi , Mohammad Hadi Hadizadeh Yazdi , Sofie Ceberg , Marianne Camille Aznar , Fatemeh Varshoee Tabrizi , Roham Salek , Matthias Guckenberger , Stephanie Tanadini-Lang
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引用次数: 0

摘要

背景和目的运动管理技术对于充分保护健康组织非常重要。然而,这些技术非常复杂,需要专门的质量保证。本研究的目的是创建一个动态模型,用于质量保证,并复制患者的体型、解剖结构和组织密度。材料和方法使用癌症患者的计算机断层扫描(CT),通过增材制造技术创建肺、心脏、肋骨和椎体的模具。开发了一个泵系统和软件来模拟呼吸动力学。使用 4DCT 扫描量化了呼吸运动的程度。结果在呼吸过程中,胸壁向前方移动了 4 毫米到 13 毫米,向侧方移动了 2 毫米到 7 毫米。膈肌在左肺和右肺的上下移动范围分别为 5 毫米至 16 毫米和 10 毫米至 36 毫米。左肺肿瘤向上下和前后移动了 ± 7 毫米。肺部的 CT 数值为-716±108HU(模型)和-713±70HU(患者);骨骼:460 ± 20 HU(模型)和 458 ± 206 HU(患者);软组织:92 ± 9 HU(模型)和 60 ± 25 HU(患者)。端对端测试表明,离子室和胶片剂量测定的测量剂量与计算剂量之间的一致性极佳。结论建议将该模型用于质量保证,通过端对端测试或作为外部审计模型,评估机构的具体规划和运动管理策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dynamic anthropomorphic thorax phantom for quality assurance of motion management in radiotherapy

Background and purpose

Motion management techniques are important to spare the healthy tissue adequately. However, they are complex and need dedicated quality assurance. The aim of this study was to create a dynamic phantom designed for quality assurance and to replicate a patient’s size, anatomy, and tissue density.

Materials and methods

A computed tomography (CT) scan of a cancer patient was used to create molds for the lungs, heart, ribs, and vertebral column via additive manufacturing. A pump system and software were developed to simulate respiratory dynamics. The extent of respiratory motion was quantified using a 4DCT scan. End-to-end tests were conducted to evaluate two motion management techniques for lung stereotactic body radiotherapy (SBRT).

Results

The chest wall moved between 4 mm and 13 mm anteriorly and 2 mm to 7 mm laterally during the breathing. The diaphragm exhibited superior-inferior movement ranging from 5 mm to 16 mm in the left lung and 10 mm to 36 mm in the right lung. The left lung tumor displaced ± 7 mm superior-inferiorly and anterior-posteriorly. The CT numbers were for lung: −716 ± 108 HU (phantom) and −713 ± 70 HU (patient); bone: 460 ± 20 HU (phantom) and 458 ± 206 HU (patient); soft tissue: 92 ± 9 HU (phantom) and 60 ± 25 HU (patient). The end-to-end testing showed an excellent agreement between the measured and the calculated dose for ion chamber and film dosimetry.

Conclusions

The phantom is recommended for quality assurance, evaluating the institution’s specific planning and motion management strategies either through end-to-end testing or as an external audit phantom.

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来源期刊
Physics and Imaging in Radiation Oncology
Physics and Imaging in Radiation Oncology Physics and Astronomy-Radiation
CiteScore
5.30
自引率
18.90%
发文量
93
审稿时长
6 weeks
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