Intrafraction target shift comparison using two breath-hold systems in lung stereotactic body radiotherapy

Prado, Alejandro; Zucca, D.; Casa, M.Á. De la; Martí, Jaime; Alonso, L.; Acilu, P. Garcia de; García, Juan Diego Mediavilla; Hernando, O.; Fernandez-Leton, P.; Rubio, Carmen

doi:10.1016/j.phro.2022.04.004

Cited by 10 publications

(7 citation statements)

References 33 publications

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“…The mean difference between values and CBCT shifts remained <0.03 mm in the vertical direction and <0.4 mm in the other five directions, and the tumor remained within the planning target volume (PTV) whenever the surface position was within SGRT tolerance. Previous studies have reported similar findings 15,16 . Sarudis et al 17 .…”

Section: Introductionsupporting

confidence: 73%

“…Previous studies have reported similar findings. 15,16 Sarudis et al 17 demonstrated that SGRT is a viable approach for lung SBRT. Many studies have found the results of SGRT and CBCT are in good agreement, it can improve the radiation protection of patients and save treatment time, so as to monitor the patients' fractional movement without additional CBCT.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have reported similar findings. 15 , 16 Sarudis et al. 17 demonstrated that SGRT is a viable approach for lung SBRT.…”

Section: Introductionmentioning

confidence: 99%

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SGRT‐based stereotactic body radiotherapy for lung cancer setup accuracy and margin of the PTV

Guo,

Wu,

Huan

et al. 2023

J Applied Clin Med Phys

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ObjectiveSurface‐guided radiation therapy (SGRT, AlignRT) was used to analyze motion during stereotactic body radiotherapy (SBRT) in lung cancer patients and to explore the margin of the planning target volume (PTV).MethodsThe residual errors of the AlignRT were evaluated based on grayscale cone‐beam computed tomography registration results before each treatment. AlignRT log file was used to analyze the correlation between the frequency and longest duration of errors larger than 2 mm and lasting longer than 2 s and maximum error with age and treatment duration. The displacement value at the end of treatment, the average displacement value, and the 95% probability density displacement interval were defined as intrafraction errors, and PTV1, PTV2, PTV3 were calculated by Van Herk formula or Z score analysis. Organ dosimetric differences were compared after the experience‐based margin was replaced with PTV3.ResultsThe interfraction residual errors were Vrt0, 0.06 ± 0.18 cm; Lng0, ‐0.03 ± 0.19 cm; Lat0, 0.02 ± 0.15 cm; Pitch0, 0.23 ± 0.7°; Roll0, 0.1 ± 0.69°; Rtn0, ‐0.02 ± 0.79°. The frequency, longest duration and maximum error in vertical direction were correlated with treatment duration (r = 0.404, 0.353, 0.283, p < 0.05, respectively). In the longitudinal direction, the frequency was correlated with age and treatment duration (r = 0.376, 0.283, p < 0.05, respectively), maximum error was correlated with age (r = 0.4, P < 0.05). Vertical, longitudinal, lateral margins of PTV1, PTV2, PTV3 were 2 mm, 4 mm, 2 mm; 2 mm, 2 mm, 2 mm, 3 mm, 5 mm, 3 mm, respectively. After replacing the original PTV, mean lung dose (MLD), 2‐cm3 chest wall dose (CD), lung V20 decreased by 0.2 Gy, 2.1 Gy, 0.5%, respectively (p < 0.05).ConclusionAlignRT can be used for interfraction setup and monitoring intrafraction motion. It is more reasonable to use upper and lower limits of the 95% probability density interval as an intrafraction error.

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Section: Introductionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

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SGRT‐based stereotactic body radiotherapy for lung cancer setup accuracy and margin of the PTV

Guo,

Wu,

Huan

et al. 2023

J Applied Clin Med Phys

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show abstract

“…The correlation between the lung tumor and fiducial markers was low, with approximately 30 % of the fiducial markers obtained by comparison between lung tumor and lung volume. Therefore, the lung volume cannot completely track slight respiratory movements; however, it is effective for stable and auxiliary monitoring [16] .…”

Section: Discussionmentioning

confidence: 99%

Statistical evaluation of the effectiveness of dual amplitude-gated stereotactic body radiotherapy using fiducial markers and lung volume

Tanabe

Tanaka

2022

Physics and Imaging in Radiation Oncology

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“…The spatial coordinates of the fiducial marker may be displaced during SBRT, and the amplitude difference between the lung tumor and fiducial marker should be observed during SBRT [20] . In the future, we believe that more robust and dynamic tracking during SBRT may be realized by combining magnetic resonance imaging and respiration by lung volume in addition to fiducial marker [9] , [12] , [21] , [22] .…”

Section: Discussionmentioning

confidence: 99%

Patient-specific respiratory motion management using lung tumors vs fiducial markers for real-time tumor-tracking stereotactic body radiotherapy

Tanabe¹,

Kiritani²,

Deguchi³

et al. 2023

Physics and Imaging in Radiation Oncology

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Intrafraction target shift comparison using two breath-hold systems in lung stereotactic body radiotherapy

Cited by 10 publications

References 33 publications

SGRT‐based stereotactic body radiotherapy for lung cancer setup accuracy and margin of the PTV

SGRT‐based stereotactic body radiotherapy for lung cancer setup accuracy and margin of the PTV

Statistical evaluation of the effectiveness of dual amplitude-gated stereotactic body radiotherapy using fiducial markers and lung volume

Patient-specific respiratory motion management using lung tumors vs fiducial markers for real-time tumor-tracking stereotactic body radiotherapy

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