Dynamic anthropomorphic thorax phantom for quality assurance of motion management in radiotherapy
(2024) In Physics and imaging in radiation oncology 30.- Abstract
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... (More)
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.
(Less)
- author
- Abdollahi, Sara ; Mowlavi, Ali Asghar ; Yazdi, Mohammad Hadi Hadizadeh ; Ceberg, Sofie LU ; Aznar, Marianne Camille ; Tabrizi, Fatemeh Varshoee ; Salek, Roham ; Guckenberger, Matthias and Tanadini-Lang, Stephanie
- organization
- publishing date
- 2024-04
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Dynamic anthropomorphic phantom, End-to-end test, Lung SBRT
- in
- Physics and imaging in radiation oncology
- volume
- 30
- article number
- 100587
- publisher
- Elsevier
- external identifiers
-
- pmid:38818304
- scopus:85193622012
- ISSN
- 2405-6316
- DOI
- 10.1016/j.phro.2024.100587
- language
- English
- LU publication?
- yes
- id
- e594e617-d21c-4fb1-bcb7-dd287fcfe898
- date added to LUP
- 2024-05-31 14:00:39
- date last changed
- 2025-11-02 14:00:24
@article{e594e617-d21c-4fb1-bcb7-dd287fcfe898,
abstract = {{<p>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.</p>}},
author = {{Abdollahi, Sara and Mowlavi, Ali Asghar and Yazdi, Mohammad Hadi Hadizadeh and Ceberg, Sofie and Aznar, Marianne Camille and Tabrizi, Fatemeh Varshoee and Salek, Roham and Guckenberger, Matthias and Tanadini-Lang, Stephanie}},
issn = {{2405-6316}},
keywords = {{Dynamic anthropomorphic phantom; End-to-end test; Lung SBRT}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Physics and imaging in radiation oncology}},
title = {{Dynamic anthropomorphic thorax phantom for quality assurance of motion management in radiotherapy}},
url = {{http://dx.doi.org/10.1016/j.phro.2024.100587}},
doi = {{10.1016/j.phro.2024.100587}},
volume = {{30}},
year = {{2024}},
}