Evaluation of a novel phantom for the quality assurance of a six-degree-of-freedom couch 3D-printed at multiple centres.

Autor: Marshall H; Patrick G. Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK. Electronic address: hannah.marshall@belfasttrust.hscni.net., Selvan T; Department of Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, Belfast, UK., Ahmad R; Department of Medical Physics and Biomedical Engineering, University College London, London, UK., Bento M; Department of Medical Physics and Biomedical Engineering, University College London, London, UK., Veiga C; Department of Medical Physics and Biomedical Engineering, University College London, London, UK., Sands G; Radiotherapy Physics, UCLH NHS Foundation Trust, London, UK., Malone C; Radiotherapy Physics, St. Luke's Radiation Oncology Network, Dublin, Ireland., King RB; Department of Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, Belfast, UK., Clark CH; Department of Medical Physics and Biomedical Engineering, University College London, London, UK; Radiotherapy Physics, UCLH NHS Foundation Trust, London, UK; Metrology for Medical Physics, National Physical Laboratory, Teddington, UK., McGarry CK; Patrick G. Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK; Department of Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, Belfast, UK.
Jazyk: angličtina
Zdroj: Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB) [Phys Med] 2023 Oct; Vol. 114, pp. 103136. Date of Electronic Publication: 2023 Sep 26.
DOI: 10.1016/j.ejmp.2023.103136
Abstrakt: This study aimed to validate a bespoke 3D-printed phantom for use in quality assurance (QA) of a 6 degrees-of-freedom (6DoF) treatment couch. A novel phantom design comprising a main body with internal cube structures, was fabricated at five centres using Polylactic Acid (PLA) material, with an additional phantom produced incorporating a PLA-stone hybrid material. Correctional setup shifts were determined using image registration by 3D-3D matching of high HU cube structures between obtained cone-beam computer tomography (CBCT) images to reference CTs, containing cubes with fabricated rotational offsets of 3.5°, 1.5° and -2.5° in rotation, pitch, and roll, respectively. Average rotational setup shifts were obtained for each phantom. The reproducibility of 3D-printing was probed by comparing the internal cube size as well as Hounsfield Units between each of the uniquely produced phantoms. For the five PLA phantoms, the average rot, pitch and roll correctional differences from the fabricated offsets were -0.3 ± 0.2°, -0.2 ± 0.5° and 0.2 ± 0.3° respectively, and for the PLA hybrid these differences were -0.09 ± 0.14°, 0.30 ± 0.00° and 0.03 ± 0.10°. There was found to be no statistically significant difference in average cube size between the five PLA printed phantoms, with the significant difference (P < 0.05) in HU of one phantom compared to the others attributed to setup choice and material density. This work demonstrated the capability producing a novel 3D-printed 6DoF couch QA phantom design, at multiple centres, with each unique model capable of sub-degree couch correction.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Associazione Italiana di Fisica Medica e Sanitaria. Published by Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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