Geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology
Background and purpose: Surface guided radiotherapy can be used to improve patient setup and for accurate intra-fraction motion monitoring in correspondence to the isocenter. For a clinical relevant motion analysis the actual displacement of the entire clinical target volume (CTV) is necessary. Ther...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-10-01
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| Series: | Physics and Imaging in Radiation Oncology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405631621000701 |
| _version_ | 1818403875328098304 |
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| author | Janita Dekker Teun Pieter van Wagenberg Mariska de Smet Marion Essers Martijn Kusters Willy de Kruijf |
| author_facet | Janita Dekker Teun Pieter van Wagenberg Mariska de Smet Marion Essers Martijn Kusters Willy de Kruijf |
| author_sort | Janita Dekker |
| collection | DOAJ |
| description | Background and purpose: Surface guided radiotherapy can be used to improve patient setup and for accurate intra-fraction motion monitoring in correspondence to the isocenter. For a clinical relevant motion analysis the actual displacement of the entire clinical target volume (CTV) is necessary. Therefore, the aim of this study was to develop a novel assessment method for intra-fraction motion for rigid body structures based on motion data and a geometrical analysis. Materials and methods: A threshold value on the volume coverage (VC(t)) of the CTV by the planning target volume (PTV) was proposed as online motion monitoring method. Moreover, offline analysis was performed by using heat maps and by calculating VCx, the volume coverage for at least x% of treatment time. The method was applied retrospectively to patient treatment data for whole brain radiation treatment without a thermoplastic mask. Results: In 132 out of 142 fractions in total the proportion of the CTV that was inside the PTV for at least 99% of the time (VC99) was more than 95%, for a CTV-to-PTV margin of 5 mm. The source-voxel heat map showed which part of the CTV had a reduced coverage and the target heat map showed the movement of the CTV. Conclusion: Instead of using an action threshold on the movements of the isocenter, a threshold on the VC(t) of the CTV by the PTV was proposed. The heat maps and resulting values of VCx can be used to adapt the VC(t) threshold or the CTV-to-PTV margin for subsequent fractions. |
| first_indexed | 2024-12-14T08:31:12Z |
| format | Article |
| id | doaj.art-2fb4060576fe4cba99c97729e9dd317c |
| institution | Directory Open Access Journal |
| issn | 2405-6316 |
| language | English |
| last_indexed | 2024-12-14T08:31:12Z |
| publishDate | 2021-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics and Imaging in Radiation Oncology |
| spelling | doaj.art-2fb4060576fe4cba99c97729e9dd317c2022-12-21T23:09:30ZengElsevierPhysics and Imaging in Radiation Oncology2405-63162021-10-0120105110Geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncologyJanita Dekker0Teun Pieter van Wagenberg1Mariska de Smet2Marion Essers3Martijn Kusters4Willy de Kruijf5Instituut Verbeeten, Klinische Fysica & Instrumentatie, Postbus 90120, 5000 LA Tilburg, The Netherlands; Corresponding author.Instituut Verbeeten, Klinische Fysica & Instrumentatie, Postbus 90120, 5000 LA Tilburg, The Netherlands; Department of Biomedical Engineering, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The NetherlandsInstituut Verbeeten, Klinische Fysica & Instrumentatie, Postbus 90120, 5000 LA Tilburg, The NetherlandsInstituut Verbeeten, Klinische Fysica & Instrumentatie, Postbus 90120, 5000 LA Tilburg, The NetherlandsDepartment of Radiation Oncology, Radboud University Medical Center, Geert Grooteplein 32, 6525 GA Nijmegen, The NetherlandsInstituut Verbeeten, Klinische Fysica & Instrumentatie, Postbus 90120, 5000 LA Tilburg, The NetherlandsBackground and purpose: Surface guided radiotherapy can be used to improve patient setup and for accurate intra-fraction motion monitoring in correspondence to the isocenter. For a clinical relevant motion analysis the actual displacement of the entire clinical target volume (CTV) is necessary. Therefore, the aim of this study was to develop a novel assessment method for intra-fraction motion for rigid body structures based on motion data and a geometrical analysis. Materials and methods: A threshold value on the volume coverage (VC(t)) of the CTV by the planning target volume (PTV) was proposed as online motion monitoring method. Moreover, offline analysis was performed by using heat maps and by calculating VCx, the volume coverage for at least x% of treatment time. The method was applied retrospectively to patient treatment data for whole brain radiation treatment without a thermoplastic mask. Results: In 132 out of 142 fractions in total the proportion of the CTV that was inside the PTV for at least 99% of the time (VC99) was more than 95%, for a CTV-to-PTV margin of 5 mm. The source-voxel heat map showed which part of the CTV had a reduced coverage and the target heat map showed the movement of the CTV. Conclusion: Instead of using an action threshold on the movements of the isocenter, a threshold on the VC(t) of the CTV by the PTV was proposed. The heat maps and resulting values of VCx can be used to adapt the VC(t) threshold or the CTV-to-PTV margin for subsequent fractions.http://www.sciencedirect.com/science/article/pii/S2405631621000701Intra-fraction motion monitoringSurface guided radiotherapyRigid bodyIsocenter movement |
| spellingShingle | Janita Dekker Teun Pieter van Wagenberg Mariska de Smet Marion Essers Martijn Kusters Willy de Kruijf Geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology Physics and Imaging in Radiation Oncology Intra-fraction motion monitoring Surface guided radiotherapy Rigid body Isocenter movement |
| title | Geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology |
| title_full | Geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology |
| title_fullStr | Geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology |
| title_full_unstemmed | Geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology |
| title_short | Geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology |
| title_sort | geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology |
| topic | Intra-fraction motion monitoring Surface guided radiotherapy Rigid body Isocenter movement |
| url | http://www.sciencedirect.com/science/article/pii/S2405631621000701 |
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