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Marshall H, Selvan T, Ahmad R, Bento M, Veiga C, Sands G, Malone C, King RB, Clark CH, McGarry CK. Evaluation of a novel phantom for the quality assurance of a six-degree-of-freedom couch 3D-printed at multiple centres. Phys Med 2023; 114:103136. [PMID: 37769414 DOI: 10.1016/j.ejmp.2023.103136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 08/18/2023] [Accepted: 09/13/2023] [Indexed: 09/30/2023] Open
Abstract
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.
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Affiliation(s)
- Hannah Marshall
- Patrick G. Johnston Centre for Cancer Research, Queen's University Belfast, Belfast, UK.
| | - Tamil Selvan
- Department of Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, Belfast, UK
| | - Reem Ahmad
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
| | - Mariana Bento
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
| | - Catarina Veiga
- Department of Medical Physics and Biomedical Engineering, University College London, London, UK
| | - Gordon Sands
- Radiotherapy Physics, UCLH NHS Foundation Trust, London, UK
| | - Ciaran Malone
- Radiotherapy Physics, St. Luke's Radiation Oncology Network, Dublin, Ireland
| | - Raymond B King
- Department of Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, Belfast, UK
| | - Catharine H Clark
- 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
| | - Conor K McGarry
- 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
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A novel end-to-end test for combined dosimetric and geometric treatment verification using a 3D-printed phantom. Med Dosim 2022; 47:177-183. [DOI: 10.1016/j.meddos.2022.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 12/20/2021] [Accepted: 02/04/2022] [Indexed: 11/22/2022]
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