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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Autores principales:	Janita Dekker, Teun Pieter van Wagenberg, Mariska de Smet, Marion Essers, Martijn Kusters, Willy de Kruijf
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Intra-fraction motion monitoring Surface guided radiotherapy Rigid body Isocenter movement Medical physics. Medical radiology. Nuclear medicine R895-920 Neoplasms. Tumors. Oncology. Including cancer and carcinogens RC254-282
Acceso en línea:	https://doaj.org/article/2fb4060576fe4cba99c97729e9dd317c
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spelling	oai:doaj.org-article:2fb4060576fe4cba99c97729e9dd317c2021-12-02T05:02:13ZGeometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology2405-631610.1016/j.phro.2021.11.006https://doaj.org/article/2fb4060576fe4cba99c97729e9dd317c2021-10-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2405631621000701https://doaj.org/toc/2405-6316Background 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.Janita DekkerTeun Pieter van WagenbergMariska de SmetMarion EssersMartijn KustersWilly de KruijfElsevierarticleIntra-fraction motion monitoringSurface guided radiotherapyRigid bodyIsocenter movementMedical physics. Medical radiology. Nuclear medicineR895-920Neoplasms. Tumors. Oncology. Including cancer and carcinogensRC254-282ENPhysics and Imaging in Radiation Oncology, Vol 20, Iss , Pp 105-110 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Intra-fraction motion monitoring Surface guided radiotherapy Rigid body Isocenter movement Medical physics. Medical radiology. Nuclear medicine R895-920 Neoplasms. Tumors. Oncology. Including cancer and carcinogens RC254-282
spellingShingle	Intra-fraction motion monitoring Surface guided radiotherapy Rigid body Isocenter movement Medical physics. Medical radiology. Nuclear medicine R895-920 Neoplasms. Tumors. Oncology. Including cancer and carcinogens RC254-282 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
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.
format	article
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
title	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_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_sort	geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/2fb4060576fe4cba99c97729e9dd317c
work_keys_str_mv	AT janitadekker geometricalanalysisformotionmonitoringofrigidbodieswithopticalsurfacescanninginradiationoncology AT teunpietervanwagenberg geometricalanalysisformotionmonitoringofrigidbodieswithopticalsurfacescanninginradiationoncology AT mariskadesmet geometricalanalysisformotionmonitoringofrigidbodieswithopticalsurfacescanninginradiationoncology AT marionessers geometricalanalysisformotionmonitoringofrigidbodieswithopticalsurfacescanninginradiationoncology AT martijnkusters geometricalanalysisformotionmonitoringofrigidbodieswithopticalsurfacescanninginradiationoncology AT willydekruijf geometricalanalysisformotionmonitoringofrigidbodieswithopticalsurfacescanninginradiationoncology
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Geometrical analysis for motion monitoring of rigid bodies with optical surface scanning in radiation oncology

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