Performance evaluation of a second‐generation O‐ring‐shaped image‐guided radiotherapy system with a gimbal‐mounted linear accelerator and real‐time tracking capabilities

Purpose OXRAY, a state‐of‐the‐art radiation therapy system commercialized by Hitachi High‐Tech Ltd. in 2023, integrates unique beam delivery and image‐guided radiation therapy (IGRT) technologies as the successor to Vero4DRT. This study evaluated the performance of this second‐generation O‐ring‐shap...

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Vydáno v:Journal of applied clinical medical physics Ročník 26; číslo 11; s. e70329 - n/a
Hlavní autoři: Kawata, Kohei, Kishigami, Yukako, Hirashima, Hideaki, Sawada, Yohei, Urago, Maika, Fujimoto, Takahiro, Fukuda, Tetsuo, Mizowaki, Takashi, Nakamura, Mitsuhiro
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States John Wiley & Sons, Inc 01.11.2025
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ISSN:1526-9914, 1526-9914
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Abstract Purpose OXRAY, a state‐of‐the‐art radiation therapy system commercialized by Hitachi High‐Tech Ltd. in 2023, integrates unique beam delivery and image‐guided radiation therapy (IGRT) technologies as the successor to Vero4DRT. This study evaluated the performance of this second‐generation O‐ring‐shaped linear accelerator. Methods The percentage depth dose (PDD) and off‐center ratio (OCR) were calculated using the RayStation 2023B treatment planning system with multileaf collimator‐shaped square fields. PDDs were evaluated up to a depth of 250 mm and OCRs at depths of 15, 100, and 200 mm, compared with measurements. Patient‐specific quality assurance (PSQA) was conducted for 28 volumetric‐modulated arc therapy plans and evaluated using gamma pass rates (GPRs) based on a 3%/2 mm criterion. The biaxial rotational dynamic radiation therapy (BROAD‐RT) performance was validated with 25 trajectories. A tracking experiment under rotational irradiation was performed to assess the tracking accuracy. Additionally, image‐guidance systems (kV X‐ray and kV cone‐beam computed tomography) were evaluated using anthropomorphic phantoms. The localization accuracy (LA) was determined by comparing the known offsets with the noted differences between the initial and corrected positions. Results Differences between the calculated and measured data were within the tolerance limits defined in European Society for Radiotherapy and Oncology Booklet 7 and American Association of Physicists in Medicine (AAPM) Medical Physics Practice Guideline 5.b. The median PSQA GPRs exceeded 95%, satisfying AAPM Task Group‐218 criteria. BROAD‐RT demonstrated submillimeter accuracy (within 0.4 mm), even for complex trajectories. The tracking accuracy remained within 1 mm even during rotational delivery. LA was within 0.5 mm for translational shifts and 0.5° for rotational adjustments. Conclusion OXRAY demonstrated clinically acceptable beam quality and high‐precision dose delivery outcomes. The tracking accuracy was maintained under rotational irradiation. Automatic image registration enabled accurate, reproducible patient positioning, supporting reliable IGRT implementation. These findings offer practical guidance and technical benchmarks for institutions adopting OXRAY.
AbstractList OXRAY, a state-of-the-art radiation therapy system commercialized by Hitachi High-Tech Ltd. in 2023, integrates unique beam delivery and image-guided radiation therapy (IGRT) technologies as the successor to Vero4DRT. This study evaluated the performance of this second-generation O-ring-shaped linear accelerator.PURPOSEOXRAY, a state-of-the-art radiation therapy system commercialized by Hitachi High-Tech Ltd. in 2023, integrates unique beam delivery and image-guided radiation therapy (IGRT) technologies as the successor to Vero4DRT. This study evaluated the performance of this second-generation O-ring-shaped linear accelerator.The percentage depth dose (PDD) and off-center ratio (OCR) were calculated using the RayStation 2023B treatment planning system with multileaf collimator-shaped square fields. PDDs were evaluated up to a depth of 250 mm and OCRs at depths of 15, 100, and 200 mm, compared with measurements. Patient-specific quality assurance (PSQA) was conducted for 28 volumetric-modulated arc therapy plans and evaluated using gamma pass rates (GPRs) based on a 3%/2 mm criterion. The biaxial rotational dynamic radiation therapy (BROAD-RT) performance was validated with 25 trajectories. A tracking experiment under rotational irradiation was performed to assess the tracking accuracy. Additionally, image-guidance systems (kV X-ray and kV cone-beam computed tomography) were evaluated using anthropomorphic phantoms. The localization accuracy (LA) was determined by comparing the known offsets with the noted differences between the initial and corrected positions.METHODSThe percentage depth dose (PDD) and off-center ratio (OCR) were calculated using the RayStation 2023B treatment planning system with multileaf collimator-shaped square fields. PDDs were evaluated up to a depth of 250 mm and OCRs at depths of 15, 100, and 200 mm, compared with measurements. Patient-specific quality assurance (PSQA) was conducted for 28 volumetric-modulated arc therapy plans and evaluated using gamma pass rates (GPRs) based on a 3%/2 mm criterion. The biaxial rotational dynamic radiation therapy (BROAD-RT) performance was validated with 25 trajectories. A tracking experiment under rotational irradiation was performed to assess the tracking accuracy. Additionally, image-guidance systems (kV X-ray and kV cone-beam computed tomography) were evaluated using anthropomorphic phantoms. The localization accuracy (LA) was determined by comparing the known offsets with the noted differences between the initial and corrected positions.Differences between the calculated and measured data were within the tolerance limits defined in European Society for Radiotherapy and Oncology Booklet 7 and American Association of Physicists in Medicine (AAPM) Medical Physics Practice Guideline 5.b. The median PSQA GPRs exceeded 95%, satisfying AAPM Task Group-218 criteria. BROAD-RT demonstrated submillimeter accuracy (within 0.4 mm), even for complex trajectories. The tracking accuracy remained within 1 mm even during rotational delivery. LA was within 0.5 mm for translational shifts and 0.5° for rotational adjustments.RESULTSDifferences between the calculated and measured data were within the tolerance limits defined in European Society for Radiotherapy and Oncology Booklet 7 and American Association of Physicists in Medicine (AAPM) Medical Physics Practice Guideline 5.b. The median PSQA GPRs exceeded 95%, satisfying AAPM Task Group-218 criteria. BROAD-RT demonstrated submillimeter accuracy (within 0.4 mm), even for complex trajectories. The tracking accuracy remained within 1 mm even during rotational delivery. LA was within 0.5 mm for translational shifts and 0.5° for rotational adjustments.OXRAY demonstrated clinically acceptable beam quality and high-precision dose delivery outcomes. The tracking accuracy was maintained under rotational irradiation. Automatic image registration enabled accurate, reproducible patient positioning, supporting reliable IGRT implementation. These findings offer practical guidance and technical benchmarks for institutions adopting OXRAY.CONCLUSIONOXRAY demonstrated clinically acceptable beam quality and high-precision dose delivery outcomes. The tracking accuracy was maintained under rotational irradiation. Automatic image registration enabled accurate, reproducible patient positioning, supporting reliable IGRT implementation. These findings offer practical guidance and technical benchmarks for institutions adopting OXRAY.
Purpose OXRAY, a state‐of‐the‐art radiation therapy system commercialized by Hitachi High‐Tech Ltd. in 2023, integrates unique beam delivery and image‐guided radiation therapy (IGRT) technologies as the successor to Vero4DRT. This study evaluated the performance of this second‐generation O‐ring‐shaped linear accelerator. Methods The percentage depth dose (PDD) and off‐center ratio (OCR) were calculated using the RayStation 2023B treatment planning system with multileaf collimator‐shaped square fields. PDDs were evaluated up to a depth of 250 mm and OCRs at depths of 15, 100, and 200 mm, compared with measurements. Patient‐specific quality assurance (PSQA) was conducted for 28 volumetric‐modulated arc therapy plans and evaluated using gamma pass rates (GPRs) based on a 3%/2 mm criterion. The biaxial rotational dynamic radiation therapy (BROAD‐RT) performance was validated with 25 trajectories. A tracking experiment under rotational irradiation was performed to assess the tracking accuracy. Additionally, image‐guidance systems (kV X‐ray and kV cone‐beam computed tomography) were evaluated using anthropomorphic phantoms. The localization accuracy (LA) was determined by comparing the known offsets with the noted differences between the initial and corrected positions. Results Differences between the calculated and measured data were within the tolerance limits defined in European Society for Radiotherapy and Oncology Booklet 7 and American Association of Physicists in Medicine (AAPM) Medical Physics Practice Guideline 5.b. The median PSQA GPRs exceeded 95%, satisfying AAPM Task Group‐218 criteria. BROAD‐RT demonstrated submillimeter accuracy (within 0.4 mm), even for complex trajectories. The tracking accuracy remained within 1 mm even during rotational delivery. LA was within 0.5 mm for translational shifts and 0.5° for rotational adjustments. Conclusion OXRAY demonstrated clinically acceptable beam quality and high‐precision dose delivery outcomes. The tracking accuracy was maintained under rotational irradiation. Automatic image registration enabled accurate, reproducible patient positioning, supporting reliable IGRT implementation. These findings offer practical guidance and technical benchmarks for institutions adopting OXRAY.
Purpose OXRAY, a state‐of‐the‐art radiation therapy system commercialized by Hitachi High‐Tech Ltd. in 2023, integrates unique beam delivery and image‐guided radiation therapy (IGRT) technologies as the successor to Vero4DRT. This study evaluated the performance of this second‐generation O‐ring‐shaped linear accelerator. Methods The percentage depth dose (PDD) and off‐center ratio (OCR) were calculated using the RayStation 2023B treatment planning system with multileaf collimator‐shaped square fields. PDDs were evaluated up to a depth of 250 mm and OCRs at depths of 15, 100, and 200 mm, compared with measurements. Patient‐specific quality assurance (PSQA) was conducted for 28 volumetric‐modulated arc therapy plans and evaluated using gamma pass rates (GPRs) based on a 3%/2 mm criterion. The biaxial rotational dynamic radiation therapy (BROAD‐RT) performance was validated with 25 trajectories. A tracking experiment under rotational irradiation was performed to assess the tracking accuracy. Additionally, image‐guidance systems (kV X‐ray and kV cone‐beam computed tomography) were evaluated using anthropomorphic phantoms. The localization accuracy (LA) was determined by comparing the known offsets with the noted differences between the initial and corrected positions. Results Differences between the calculated and measured data were within the tolerance limits defined in European Society for Radiotherapy and Oncology Booklet 7 and American Association of Physicists in Medicine (AAPM) Medical Physics Practice Guideline 5.b. The median PSQA GPRs exceeded 95%, satisfying AAPM Task Group‐218 criteria. BROAD‐RT demonstrated submillimeter accuracy (within 0.4 mm), even for complex trajectories. The tracking accuracy remained within 1 mm even during rotational delivery. LA was within 0.5 mm for translational shifts and 0.5° for rotational adjustments. Conclusion OXRAY demonstrated clinically acceptable beam quality and high‐precision dose delivery outcomes. The tracking accuracy was maintained under rotational irradiation. Automatic image registration enabled accurate, reproducible patient positioning, supporting reliable IGRT implementation. These findings offer practical guidance and technical benchmarks for institutions adopting OXRAY.
OXRAY, a state-of-the-art radiation therapy system commercialized by Hitachi High-Tech Ltd. in 2023, integrates unique beam delivery and image-guided radiation therapy (IGRT) technologies as the successor to Vero4DRT. This study evaluated the performance of this second-generation O-ring-shaped linear accelerator. The percentage depth dose (PDD) and off-center ratio (OCR) were calculated using the RayStation 2023B treatment planning system with multileaf collimator-shaped square fields. PDDs were evaluated up to a depth of 250 mm and OCRs at depths of 15, 100, and 200 mm, compared with measurements. Patient-specific quality assurance (PSQA) was conducted for 28 volumetric-modulated arc therapy plans and evaluated using gamma pass rates (GPRs) based on a 3%/2 mm criterion. The biaxial rotational dynamic radiation therapy (BROAD-RT) performance was validated with 25 trajectories. A tracking experiment under rotational irradiation was performed to assess the tracking accuracy. Additionally, image-guidance systems (kV X-ray and kV cone-beam computed tomography) were evaluated using anthropomorphic phantoms. The localization accuracy (LA) was determined by comparing the known offsets with the noted differences between the initial and corrected positions. Differences between the calculated and measured data were within the tolerance limits defined in European Society for Radiotherapy and Oncology Booklet 7 and American Association of Physicists in Medicine (AAPM) Medical Physics Practice Guideline 5.b. The median PSQA GPRs exceeded 95%, satisfying AAPM Task Group-218 criteria. BROAD-RT demonstrated submillimeter accuracy (within 0.4 mm), even for complex trajectories. The tracking accuracy remained within 1 mm even during rotational delivery. LA was within 0.5 mm for translational shifts and 0.5° for rotational adjustments. OXRAY demonstrated clinically acceptable beam quality and high-precision dose delivery outcomes. The tracking accuracy was maintained under rotational irradiation. Automatic image registration enabled accurate, reproducible patient positioning, supporting reliable IGRT implementation. These findings offer practical guidance and technical benchmarks for institutions adopting OXRAY.
Author Urago, Maika
Nakamura, Mitsuhiro
Kishigami, Yukako
Mizowaki, Takashi
Fukuda, Tetsuo
Kawata, Kohei
Fujimoto, Takahiro
Hirashima, Hideaki
Sawada, Yohei
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  givenname: Yukako
  surname: Kishigami
  fullname: Kishigami, Yukako
  organization: Kyoto University
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  givenname: Hideaki
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  surname: Hirashima
  fullname: Hirashima, Hideaki
  organization: Kyoto University
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  givenname: Yohei
  surname: Sawada
  fullname: Sawada, Yohei
  organization: Kyoto University Hospital
– sequence: 5
  givenname: Maika
  surname: Urago
  fullname: Urago, Maika
  organization: Kyoto University Hospital
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  surname: Fujimoto
  fullname: Fujimoto, Takahiro
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  organization: Hitachi High‐Tech Corporation
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  fullname: Mizowaki, Takashi
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  surname: Nakamura
  fullname: Nakamura, Mitsuhiro
  email: m_nkmr@kuhp.kyoto-u.ac.jp
  organization: Kyoto University
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2025 The Author(s). Journal of Applied Clinical Medical Physics published by Wiley Periodicals LLC on behalf of American Association of Physicists in Medicine.
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Issue 11
Keywords TPS verification
tracking performance
IGRT verification
OXRAY
commissioning
Language English
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Notes Kohei Kawata and Yukako Kishigami contributed equally to this work.
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Snippet Purpose OXRAY, a state‐of‐the‐art radiation therapy system commercialized by Hitachi High‐Tech Ltd. in 2023, integrates unique beam delivery and image‐guided...
OXRAY, a state-of-the-art radiation therapy system commercialized by Hitachi High-Tech Ltd. in 2023, integrates unique beam delivery and image-guided radiation...
Purpose OXRAY, a state‐of‐the‐art radiation therapy system commercialized by Hitachi High‐Tech Ltd. in 2023, integrates unique beam delivery and image‐guided...
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StartPage e70329
SubjectTerms commissioning
Dosimetry
Humans
IGRT verification
Image Processing, Computer-Assisted - methods
Neoplasms - radiotherapy
OXRAY
Particle Accelerators - instrumentation
Phantoms, Imaging
Prostate
Quality Assurance, Health Care - standards
Quality control
Radiation therapy
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted - methods
Radiotherapy, Image-Guided - instrumentation
Radiotherapy, Image-Guided - methods
Radiotherapy, Intensity-Modulated - instrumentation
Radiotherapy, Intensity-Modulated - methods
TPS verification
tracking performance
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Title Performance evaluation of a second‐generation O‐ring‐shaped image‐guided radiotherapy system with a gimbal‐mounted linear accelerator and real‐time tracking capabilities
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