Development and accuracy evaluation of a single-camera intra-bore surface scanning system for radiotherapy in an O-ring linac
BACKGROUND AND PURPOSE: Current commercial surface scanning systems are not able to monitor patients during radiotherapy fractions in closed-bore linacs during adaptive workflows. In this work a surface scanning system for monitoring in an O-ring linac is proposed. METHODS AND MATERIALS: A depth cam...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807582/ https://www.ncbi.nlm.nih.gov/pubmed/33458272 http://dx.doi.org/10.1016/j.phro.2019.07.003 |
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author | Delombaerde, Laurence Petillion, Saskia Michiels, Steven Weltens, Caroline Depuydt, Tom |
author_facet | Delombaerde, Laurence Petillion, Saskia Michiels, Steven Weltens, Caroline Depuydt, Tom |
author_sort | Delombaerde, Laurence |
collection | PubMed |
description | BACKGROUND AND PURPOSE: Current commercial surface scanning systems are not able to monitor patients during radiotherapy fractions in closed-bore linacs during adaptive workflows. In this work a surface scanning system for monitoring in an O-ring linac is proposed. METHODS AND MATERIALS: A depth camera was mounted at the backend of the bore. The acquired surface point cloud was transformed to the linac coordinate system after a cube detection calibration step. The real-time surface was registered using an Iterative Closest Point algorithm to a reference region-of-interest of the body contour from the planning CT and of a depth camera surface acquisition from the first fraction. The positioning accuracy was investigated using anthropomorphic 3D-printed phantoms with embedded markers: a head, hand and breast. To simulate clinically observed positioning errors, each phantom was placed 24 times with 0–10 mm and 0–8° offsets from the planned position. At every position a cone-beam CT (CBCT) was acquired and a surface registration performed. The surface registration error was determined as the difference between the surface registration and the CBCT-to-CT fiducial marker registration. RESULTS: The registration errors were (mean ± SD): lat: 0.4 ± 0.8 mm, vert: −0.2 ± 0.2 mm, long: 0.3 ± 0.5 mm and Yaw: −0.2 ± 0.6°, Pitch: 0.4 ± 0.2°, Roll: 0.5 ± 0.8° for the body contour reference, and lat: −0.7 ± 0.7 mm, vert: 0.3 ± 0.2 mm, long: 0.2 ± 0.5 mm and Yaw: −0.5 ± 0.5°, Pitch: 0.1 ± 0.3°, Roll: −0.7 ± 0.7° for the captured surface reference. CONCLUSION: The proposed single camera intra-bore surface system was capable of accurately detecting phantom displacements and allows intrafraction motion monitoring for surface guided radiotherapy inside the bore of O-ring gantries. |
format | Online Article Text |
id | pubmed-7807582 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-78075822021-01-14 Development and accuracy evaluation of a single-camera intra-bore surface scanning system for radiotherapy in an O-ring linac Delombaerde, Laurence Petillion, Saskia Michiels, Steven Weltens, Caroline Depuydt, Tom Phys Imaging Radiat Oncol Original Research Article BACKGROUND AND PURPOSE: Current commercial surface scanning systems are not able to monitor patients during radiotherapy fractions in closed-bore linacs during adaptive workflows. In this work a surface scanning system for monitoring in an O-ring linac is proposed. METHODS AND MATERIALS: A depth camera was mounted at the backend of the bore. The acquired surface point cloud was transformed to the linac coordinate system after a cube detection calibration step. The real-time surface was registered using an Iterative Closest Point algorithm to a reference region-of-interest of the body contour from the planning CT and of a depth camera surface acquisition from the first fraction. The positioning accuracy was investigated using anthropomorphic 3D-printed phantoms with embedded markers: a head, hand and breast. To simulate clinically observed positioning errors, each phantom was placed 24 times with 0–10 mm and 0–8° offsets from the planned position. At every position a cone-beam CT (CBCT) was acquired and a surface registration performed. The surface registration error was determined as the difference between the surface registration and the CBCT-to-CT fiducial marker registration. RESULTS: The registration errors were (mean ± SD): lat: 0.4 ± 0.8 mm, vert: −0.2 ± 0.2 mm, long: 0.3 ± 0.5 mm and Yaw: −0.2 ± 0.6°, Pitch: 0.4 ± 0.2°, Roll: 0.5 ± 0.8° for the body contour reference, and lat: −0.7 ± 0.7 mm, vert: 0.3 ± 0.2 mm, long: 0.2 ± 0.5 mm and Yaw: −0.5 ± 0.5°, Pitch: 0.1 ± 0.3°, Roll: −0.7 ± 0.7° for the captured surface reference. CONCLUSION: The proposed single camera intra-bore surface system was capable of accurately detecting phantom displacements and allows intrafraction motion monitoring for surface guided radiotherapy inside the bore of O-ring gantries. Elsevier 2019-07-25 /pmc/articles/PMC7807582/ /pubmed/33458272 http://dx.doi.org/10.1016/j.phro.2019.07.003 Text en © 2019 The Authors http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Original Research Article Delombaerde, Laurence Petillion, Saskia Michiels, Steven Weltens, Caroline Depuydt, Tom Development and accuracy evaluation of a single-camera intra-bore surface scanning system for radiotherapy in an O-ring linac |
title | Development and accuracy evaluation of a single-camera intra-bore surface scanning system for radiotherapy in an O-ring linac |
title_full | Development and accuracy evaluation of a single-camera intra-bore surface scanning system for radiotherapy in an O-ring linac |
title_fullStr | Development and accuracy evaluation of a single-camera intra-bore surface scanning system for radiotherapy in an O-ring linac |
title_full_unstemmed | Development and accuracy evaluation of a single-camera intra-bore surface scanning system for radiotherapy in an O-ring linac |
title_short | Development and accuracy evaluation of a single-camera intra-bore surface scanning system for radiotherapy in an O-ring linac |
title_sort | development and accuracy evaluation of a single-camera intra-bore surface scanning system for radiotherapy in an o-ring linac |
topic | Original Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807582/ https://www.ncbi.nlm.nih.gov/pubmed/33458272 http://dx.doi.org/10.1016/j.phro.2019.07.003 |
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