Evaluation of collimator rotation for volumetric modulated arc therapy lung stereotactic body radiation therapy using flattening filter free

Sandrini, Emmily Santos; Silva, Ademir Xavier da; Silva, Claudia Menezes da

doi:10.1016/j.apradiso.2018.05.026

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…Conventionally, volumetric modulated arc therapy (VMAT) plans generally only use one fixed collimator angle; however, the quality of VMAT plans are also related to the collimator angles. [32][33][34][35][36][37][38][39][40][41][42] More recently, dynamic collimator optimization has been proven to have a positive influence on dosimetric distribution in VMAT. [43][44][45][46][47] Similarly, acquiring multiple collimator angles during gantry rotation using the CLx technique in VMAT plans also warrants further investigation.…”

Section: Discussionmentioning

confidence: 99%

“…We determined the collimator angle based on 2‐D beam's eye view images; in further studies, it might be useful to obtain the collimator angle in 3‐D directions according to the shape of the target, because it might be better to irradiate the target area and protect the OAR. Conventionally, volumetric modulated arc therapy (VMAT) plans generally only use one fixed collimator angle; however, the quality of VMAT plans are also related to the collimator angles 32–42 . More recently, dynamic collimator optimization has been proven to have a positive influence on dosimetric distribution in VMAT 43–47 .…”

Section: Discussionmentioning

confidence: 99%

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Dosimetric effects related to collimator angle optimization in intensity‐modulated radiotherapy planning for gastric cancer

Zhao

Zhang

et al. 2021

Precision Radiation Oncology

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Objective To investigate the dosimetric impact of different collimator angle optimization methods in intensity‐modulated radiotherapy of gastric cancer. Methods A total of 10 gastric cases were retrospectively selected in this study. Three sets of plans were generated with different collimator angle optimization: setting the collimator angle to 0° (CL0), applying Eclipse automatic collimator angle optimization (CLA), and setting the collimator angle corresponding to the minimum X‐jaw gap (CLX). Different dosimetric metrics were applied in comparison of the target volume and normal tissues. Delivery efficiency was accessed in terms of control points, split fields, monitor units, and treatment time. All plans were verified using the 2‐D array MatriXX, and the γ‐index analysis was carried out by using different criteria. Results There was no significant difference in dosimetric comparison of planning target volume and organs at risk. Compared with CL0, Both CLA and CLX can significantly reduce control points, split fields, and monitor units, except that CLA increased treatment time. For dose verification, the γ passing rate showed a tendency of CLx > CLA > CL0. Conclusion For intensity‐modulated radiotherapy for gastric cancer, CLA and CLX can obtain comparable dosimetry distribution in respect to CL0. However, CLX can significantly increase the dose delivery efficiency and verification passing rates. It was suggested that CLx was beneficial in intensity‐modulated radiotherapy for gastric cancer.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Dosimetric effects related to collimator angle optimization in intensity‐modulated radiotherapy planning for gastric cancer

Zhao

Zhang

et al. 2021

Precision Radiation Oncology

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“…Multiple studies have investigated the impact of Collimator Rotation Angle (CRA) on optimal dose distribution in VMAT treatment plans [7][8][9][10][11][12]. Variations in dose delivery due to differences in CRA angles have been reported.…”

Section: Introductionmentioning

confidence: 99%

Analyzing Collimator Rotation Angle Influence on Half-beam VMAT Outcomes for Prostate Cancer: A Comparative Approach Using Statistical and Machine Learning Methods

Kim,

Choi

et al. 2024

Preprint

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Purpose This study explores the impact of Collimator Rotation Angle (CRA) settings in Half beam Volume Modulated Arc Therapy (HVMAT) for prostate cancer treatment, focusing on dose distribution and treatment efficacy. Materials and Methods Treatment plans (Total 240) for 20 prostate cancer patients were developed using HVMAT. Different CRA settings (n = 12) were employed, specifically comparing 2-arcs and 4-arcs techniques. Data were analyzed using statistical methods and machine learning models, assessing the Mean Relative Error (MRE) across varying CRA settings. Results The analysis revealed no significant impact of CRA settings on the conformity and homogeneity of radiation distribution to the target volume. All treatment plans met the average V95% target for the prescribed dose in the Planning Target Volume (PTV). Machine learning analysis showed consistent predictive accuracy across different CRA settings, with the MRE variance within 2%. Statistical tests further supported these findings, showing no significant differences in treatment plan outcomes based on CRA variations. Conclusion The study demonstrates that CRA settings in HVMAT can be selected with considerable flexibility without compromising the effectiveness of prostate cancer treatment. The results emphasize the importance of employing multi-faceted analysis, including both traditional statistical methods and advanced machine learning techniques, in optimizing HVMAT treatment plans. Although limited by a small sample size and a specific focus on prostate cancer, the findings provide valuable insights into the clinical application of HVMAT and its potential in treatment plan optimization.

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Personalized selection of unequal sub-arc collimator angles in VMAT for multiple brain metastases

Huang,

Yang,

Zeng

et al. 2024

Applied Radiation and Isotopes

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Evaluation of collimator rotation for volumetric modulated arc therapy lung stereotactic body radiation therapy using flattening filter free

Cited by 9 publications

References 11 publications

Dosimetric effects related to collimator angle optimization in intensity‐modulated radiotherapy planning for gastric cancer

Dosimetric effects related to collimator angle optimization in intensity‐modulated radiotherapy planning for gastric cancer

Analyzing Collimator Rotation Angle Influence on Half-beam VMAT Outcomes for Prostate Cancer: A Comparative Approach Using Statistical and Machine Learning Methods

Personalized selection of unequal sub-arc collimator angles in VMAT for multiple brain metastases

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