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DiBartolo D, Carpenter T, Santoro JP, Lischalk JW, Ebling D, Haas JA, Witten M, Rybstein M, Vaezi A, Repka MC. Novel VMAT planning technique improves dosimetry for head and neck cancer patients undergoing definitive chemoradiotherapy. Acta Oncol 2023; 62:189-193. [PMID: 36790072 DOI: 10.1080/0284186x.2023.2177973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- David DiBartolo
- Department of Medical Physics, Perlmutter Cancer Center at NYU Long Island, Mineola, NY
| | - Todd Carpenter
- Department of Radiation Oncology, Perlmutter Cancer Center at NYU Long Island, Mineola, NY
| | - Joseph P Santoro
- Department of Medical Physics, Perlmutter Cancer Center at NYU Long Island, Mineola, NY
| | - Jonathan W Lischalk
- Department of Radiation Oncology, Perlmutter Cancer Center at NYU Long Island, Mineola, NY.,NYCyberKnife at Perlmutter Cancer Center Manhattan, New York, NY, USA
| | - David Ebling
- Department of Radiation Oncology, Perlmutter Cancer Center at NYU Long Island, Mineola, NY
| | - Jonathan A Haas
- Department of Radiation Oncology, Perlmutter Cancer Center at NYU Long Island, Mineola, NY.,NYCyberKnife at Perlmutter Cancer Center Manhattan, New York, NY, USA
| | - Matthew Witten
- Department of Medical Physics, Perlmutter Cancer Center at NYU Long Island, Mineola, NY
| | - Marissa Rybstein
- Division of Hematology/Oncology, Perlmutter Cancer Center at NYU Long Island, Mineola, NY, USA
| | - Alec Vaezi
- Department of Otolaryngology-Head and Neck Surgery, Perlmutter Cancer Center at NYU Long Island, Mineola, NY, USA
| | - Michael C Repka
- Department of Radiation Oncology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
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Sun W, Chen K, Li Y, Xia W, Dong L, Shi Y, Ge C, Yang X, Wang L, Wang H. Optimization of collimator angles in dual-arc volumetric modulated arc therapy planning for whole-brain radiotherapy with hippocampus and inner ear sparing. Sci Rep 2021; 11:19035. [PMID: 34561504 PMCID: PMC8463591 DOI: 10.1038/s41598-021-98530-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 09/03/2021] [Indexed: 11/29/2022] Open
Abstract
To optimize the collimator angles in dual-arc volumetric modulated arc therapy (VMAT) plans for whole-brain radiotherapy with hippocampus and inner ear sparing (HIS-WBRT). Two sets of dual-arc VMAT plans were generated for 13 small-cell lung cancer patients: (1) The collimator angles of arcs 1 and 2 (θ1/θ2) were 350°/10°, 350°/30°, 350°/45°, 350°/60°, and 350°/80°, i.e., the intersection angle of θ1 and θ2 (Δθ) increased. (2) θ1/θ2 were 280°/10°, 300°/30°, 315°/45°, 330°/60°, and 350°/80°, i.e., Δθ = 90°. The conformity index (CI), homogeneity index (HI), monitor units (MUs), and dosimetric parameters of organs-at-risk were analyzed. Quality assurance for Δθ = 90° plans was performed. With Δθ increasing towards 90°, a significant improvement was observed for most parameters. In 350°/80° plans compared with 350°/10° ones, CI and HI were improved by 1.1% and 25.2%, respectively; MUs were reduced by 16.2%; minimum, maximum, and mean doses (D100%, Dmax, and Dmean, respectively) to the hippocampus were reduced by 5.5%, 6.3%, and 5.4%, respectively; Dmean to the inner ear and eye were reduced by 0.7% and 5.1%, respectively. With Δθ kept at 90°, the plan quality was not significantly affected by θ1/θ2 combinations. The gamma-index passing rates in 280°/10° and 350°/80° plans were relatively lower compared with the other Δθ = 90° plans. Δθ showed a significant effect on dual-arc VMAT plans for HIS-WBRT. With Δθ approaching 90°, the plan quality exhibited a nearly continuous improvement, whereas with Δθ = 90°, the effect of θ1/θ2 combination was insignificant.
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Affiliation(s)
- Wuji Sun
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
| | - Kunzhi Chen
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
| | - Yu Li
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
| | - Wenming Xia
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
| | - Lihua Dong
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
- Jilin Provincial Key Laboratory of Radiation Oncology and Therapy, Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
- NHC Key Laboratory of Radiobiology, School of Public Health, Jilin University, Changchun, 130021, China
| | - Yinghua Shi
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
| | - Chao Ge
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
| | - Xu Yang
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
| | - Libo Wang
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China
| | - Huidong Wang
- Department of Radiation Oncology and Therapy, The First Hospital of Jilin University, Changchun, 130021, China.
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