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Characterization of Markerless Tumor Tracking Using the On-Board Imager of a Commercial Linear Accelerator Equipped With Fast-kV Switching Dual-Energy Imaging

PURPOSE: To describe and characterize fast-kV switching, dual-energy (DE) imaging implemented within the on-board imager of a commercial linear accelerator for markerless tumor tracking (MTT). METHODS AND MATERIALS: Fast-kV switching, DE imaging provides for rapid switching between programmed tube v...

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Autores principales: Roeske, John C., Mostafavi, Hassan, Haytmyradov, Maksat, Wang, Adam, Morf, Daniel, Cortesi, Luca, Surucu, Murat, Patel, Rakesh, Cassetta, Roberto, Zhu, Liangjia, Lehmann, Mathias, Harkenrider, Matthew M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7560565/
https://www.ncbi.nlm.nih.gov/pubmed/33089019
http://dx.doi.org/10.1016/j.adro.2020.01.008
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author Roeske, John C.
Mostafavi, Hassan
Haytmyradov, Maksat
Wang, Adam
Morf, Daniel
Cortesi, Luca
Surucu, Murat
Patel, Rakesh
Cassetta, Roberto
Zhu, Liangjia
Lehmann, Mathias
Harkenrider, Matthew M.
author_facet Roeske, John C.
Mostafavi, Hassan
Haytmyradov, Maksat
Wang, Adam
Morf, Daniel
Cortesi, Luca
Surucu, Murat
Patel, Rakesh
Cassetta, Roberto
Zhu, Liangjia
Lehmann, Mathias
Harkenrider, Matthew M.
author_sort Roeske, John C.
collection PubMed
description PURPOSE: To describe and characterize fast-kV switching, dual-energy (DE) imaging implemented within the on-board imager of a commercial linear accelerator for markerless tumor tracking (MTT). METHODS AND MATERIALS: Fast-kV switching, DE imaging provides for rapid switching between programmed tube voltages (ie, 60 and 120 kVp) from one image frame to the next. To characterize this system, the weighting factor used for logarithmic subtraction and signal difference-to-noise ratio were analyzed as a function of time and frame rate. MTT was evaluated using a thorax motion phantom and fast kV, DE imaging was compared versus single energy (SE) imaging over 360 degrees of rotation. A template-based matching algorithm was used to track target motion on both DE and SE sequences. Receiver operating characteristics were used to compare tracking results for both modalities. RESULTS: The weighting factor was inversely related to frame rate and stable over time. After applying the frame rate–dependent weighting factor, the signal difference-to-noise ratio was consistent across all frame rates considered for simulated tumors ranging from 5 to 25 mm in diameter. An analysis of receiver operating characteristics curves showed improved tracking with DE versus SE imaging. The area under the curve for the 10-mm target ranged from 0.821 to 0.858 for SE imaging versus 0.968 to 0.974 for DE imaging. Moreover, the residual tracking errors for the same target size ranged from 2.02 to 2.18 mm versus 0.79 to 1.07 mm for SE and DE imaging, respectively. CONCLUSIONS: Fast-kV switching, DE imaging was implemented on the on-board imager of a commercial linear accelerator. DE imaging resulted in improved MTT accuracy over SE imaging. Such an approach may have application for MTT of patients with lung cancer receiving stereotactic body radiation therapy, particularly for small tumors where MTT with SE imaging may fail.
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spelling pubmed-75605652020-10-20 Characterization of Markerless Tumor Tracking Using the On-Board Imager of a Commercial Linear Accelerator Equipped With Fast-kV Switching Dual-Energy Imaging Roeske, John C. Mostafavi, Hassan Haytmyradov, Maksat Wang, Adam Morf, Daniel Cortesi, Luca Surucu, Murat Patel, Rakesh Cassetta, Roberto Zhu, Liangjia Lehmann, Mathias Harkenrider, Matthew M. Adv Radiat Oncol Scientific Article PURPOSE: To describe and characterize fast-kV switching, dual-energy (DE) imaging implemented within the on-board imager of a commercial linear accelerator for markerless tumor tracking (MTT). METHODS AND MATERIALS: Fast-kV switching, DE imaging provides for rapid switching between programmed tube voltages (ie, 60 and 120 kVp) from one image frame to the next. To characterize this system, the weighting factor used for logarithmic subtraction and signal difference-to-noise ratio were analyzed as a function of time and frame rate. MTT was evaluated using a thorax motion phantom and fast kV, DE imaging was compared versus single energy (SE) imaging over 360 degrees of rotation. A template-based matching algorithm was used to track target motion on both DE and SE sequences. Receiver operating characteristics were used to compare tracking results for both modalities. RESULTS: The weighting factor was inversely related to frame rate and stable over time. After applying the frame rate–dependent weighting factor, the signal difference-to-noise ratio was consistent across all frame rates considered for simulated tumors ranging from 5 to 25 mm in diameter. An analysis of receiver operating characteristics curves showed improved tracking with DE versus SE imaging. The area under the curve for the 10-mm target ranged from 0.821 to 0.858 for SE imaging versus 0.968 to 0.974 for DE imaging. Moreover, the residual tracking errors for the same target size ranged from 2.02 to 2.18 mm versus 0.79 to 1.07 mm for SE and DE imaging, respectively. CONCLUSIONS: Fast-kV switching, DE imaging was implemented on the on-board imager of a commercial linear accelerator. DE imaging resulted in improved MTT accuracy over SE imaging. Such an approach may have application for MTT of patients with lung cancer receiving stereotactic body radiation therapy, particularly for small tumors where MTT with SE imaging may fail. Elsevier 2020-03-02 /pmc/articles/PMC7560565/ /pubmed/33089019 http://dx.doi.org/10.1016/j.adro.2020.01.008 Text en © 2020 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 Scientific Article
Roeske, John C.
Mostafavi, Hassan
Haytmyradov, Maksat
Wang, Adam
Morf, Daniel
Cortesi, Luca
Surucu, Murat
Patel, Rakesh
Cassetta, Roberto
Zhu, Liangjia
Lehmann, Mathias
Harkenrider, Matthew M.
Characterization of Markerless Tumor Tracking Using the On-Board Imager of a Commercial Linear Accelerator Equipped With Fast-kV Switching Dual-Energy Imaging
title Characterization of Markerless Tumor Tracking Using the On-Board Imager of a Commercial Linear Accelerator Equipped With Fast-kV Switching Dual-Energy Imaging
title_full Characterization of Markerless Tumor Tracking Using the On-Board Imager of a Commercial Linear Accelerator Equipped With Fast-kV Switching Dual-Energy Imaging
title_fullStr Characterization of Markerless Tumor Tracking Using the On-Board Imager of a Commercial Linear Accelerator Equipped With Fast-kV Switching Dual-Energy Imaging
title_full_unstemmed Characterization of Markerless Tumor Tracking Using the On-Board Imager of a Commercial Linear Accelerator Equipped With Fast-kV Switching Dual-Energy Imaging
title_short Characterization of Markerless Tumor Tracking Using the On-Board Imager of a Commercial Linear Accelerator Equipped With Fast-kV Switching Dual-Energy Imaging
title_sort characterization of markerless tumor tracking using the on-board imager of a commercial linear accelerator equipped with fast-kv switching dual-energy imaging
topic Scientific Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7560565/
https://www.ncbi.nlm.nih.gov/pubmed/33089019
http://dx.doi.org/10.1016/j.adro.2020.01.008
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