Simplification of head and neck volumetric modulated arc therapy patient-specific quality assurance, using a Delta4 PT

Sasaki, Motoharu; Sugimoto, Wataru; Ikushima, Hitoshi

doi:10.1016/j.rpor.2020.07.004

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Details of the selection of measurement points are described below. The measurement points were selected in three sections: axial, coronal, and sagittal, using the TPS profile tool, following the method by Sasaki et al [ 12 ]. The dose at the selected measurement points was < ±1% within ±1 cm in the anteroposterior, lateral, and vertical directions from the selected measurement points.…”

Section: Methodsmentioning

confidence: 99%

Predicting the complexity of head-and-neck volumetric-modulated arc therapy planning using a radiation therapy planning quality assurance software

Sasaki

Nakaguchi

Kamomae

et al. 2022

Rep Pract Oncol Radiother.

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background/Aim: The more complex the treatment plan, the higher the possibility of errors in dose verification. recently, a treatment planning quality assurance (QA) software (planIQ) with a function to objectively evaluate the quality of volumetric-modulated arc therapy (VMAT) treatment plans by scoring and calculating the ideal dose-volume histogram has been marketed. This study aimed to assess the association between the scores of ideal treatment plans identified using planIQ and the results of dose verification and to investigate whether the results of dose verification can be predicted based on the complexity of treatment plans.Materials and methods: Dose verification was performed using an ionization chamber dosimeter, a radiochromic film, and a three-dimensional dose verification system, Delta4 pT. Correlations between the ideal treatment plan scores obtained by planIQ and the results of the absolute dose verification and dose distribution verification were obtained, and it was examined whether dose verifications could be predicted from the complexity of the treatment plans.results: even when the score from the ideal treatment plan was high, the results of absolute dose verification and dose distribution verification were sometimes poor. however, even when the score from the ideal treatment plan was low, the absolute volume verification and dose distribution verification sometimes yielded good results. conclusions: Treatment plan complexity can be determined in advance from the ideal treatment plan score calculated by planIQ. however, it is difficult to predict the results of dose verification using an ideal treatment plan.

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Section: Methodsmentioning

confidence: 99%

Predicting the complexity of head-and-neck volumetric-modulated arc therapy planning using a radiation therapy planning quality assurance software

Sasaki

Nakaguchi

Kamomae

et al. 2022

Rep Pract Oncol Radiother.

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Assessing the out-of-field dose calculation accuracy by eclipse treatment planning system in sliding window IMRT of prostate cancer patients

Moghaddam

Bakhshandeh

Ghorbani

et al. 2020

Computers in Biology and Medicine

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Delta4-based Dosimetric Error Detection in Volumetric-modulated Arc Therapy: Clinical Significance and Implications

Udee,

Commukchik,

Khamfongkhruea

et al. 2024

Journal of Medical Physics

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Background: Volumetric-modulated arc therapy (VMAT) is an efficient method of administering intensity-modulated radiotherapy beams. The Delta4 device was employed to examine patient data. Aims and Objectives: The utility of the Delta4 device in identifying errors for patient-specific quality assurance of VMAT plans was studied in this research. Materials and Methods: Intentional errors were purposely created in the collimator rotation, gantry rotation, multileaf collimator (MLC) position displacement, and increase in the number of monitor units (MU). Results: The results show that when the characteristics of the treatment plans were changed, the gamma passing rate (GPR) decreased. The largest percentage of erroneous detection was seen in the increasing number of MU, with a GPR ranging from 41 to 92. Gamma analysis was used to compare the dose distributions of the original and intentional error designs using the 2%/2 mm criteria. The percentage of dose errors (DEs) in the dose-volume histogram (DVH) was also analyzed, and the statistical association was assessed using logistic regression. A modest association (Pearson’s R-values: 0.12–0.67) was seen between the DE and GPR in all intentional plans. The findings indicated a moderate association between DVH and GPR. The data reveal that Delta4 is effective in detecting mistakes in treatment regimens for head-and-neck cancer as well as lung cancer. Conclusion: The study results also imply that Delta4 can detect errors in VMAT plans, depending on the details of the defects and the treatment plans employed.

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Simplification of head and neck volumetric modulated arc therapy patient-specific quality assurance, using a Delta4 PT

Cited by 3 publications

References 13 publications

Predicting the complexity of head-and-neck volumetric-modulated arc therapy planning using a radiation therapy planning quality assurance software

Predicting the complexity of head-and-neck volumetric-modulated arc therapy planning using a radiation therapy planning quality assurance software

Assessing the out-of-field dose calculation accuracy by eclipse treatment planning system in sliding window IMRT of prostate cancer patients

Delta4-based Dosimetric Error Detection in Volumetric-modulated Arc Therapy: Clinical Significance and Implications

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