Dosimetric Comparison of Noncoplanar VMAT Without Rotating the Patient Couch Versus Conventional Coplanar/Noncoplanar VMAT for Head and Neck Cancer: First Report of Dynamic Swing Arc
Purpose: This retrospective planning study aimed to verify the usefulness of a clinically available method, dynamic swing arc (DSA), a noncoplanar volumetric modulated arc therapy (VMAT) technique, of the new accelerator OXRAY for head and neck squamous cell carcinoma (HNSCC). We performed dosimetri...
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Elsevier
2025-03-01
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| Series: | Advances in Radiation Oncology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2452109424002690 |
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| author | Kouta Hirotaki, MS Kento Tomizawa, MD, PhD Satoe Kitou, BS Shunta Jinno, MS Shunsuke Moriya, PhD Takeshi Fujisawa, MD Sadamoto Zenda, MD, PhD Takeji Sakae, PhD Masashi Ito, BS |
| author_facet | Kouta Hirotaki, MS Kento Tomizawa, MD, PhD Satoe Kitou, BS Shunta Jinno, MS Shunsuke Moriya, PhD Takeshi Fujisawa, MD Sadamoto Zenda, MD, PhD Takeji Sakae, PhD Masashi Ito, BS |
| author_sort | Kouta Hirotaki, MS |
| collection | DOAJ |
| description | Purpose: This retrospective planning study aimed to verify the usefulness of a clinically available method, dynamic swing arc (DSA), a noncoplanar volumetric modulated arc therapy (VMAT) technique, of the new accelerator OXRAY for head and neck squamous cell carcinoma (HNSCC). We performed dosimetric comparisons between DSA and conventional coplanar/noncoplanar VMAT (C-VMAT/NC-VMAT) plans for HNSCC. Methods and Materials: We selected 32 patients with oropharyngeal and hypopharyngeal cancer treated with C-VMAT at National Cancer Center Hospital East between September 2018 and July 2023. DSA and C/NC-VMAT plans were generated using OXRAY and TrueBeam, respectively. DSA employed noncoplanar 2-arc beams with an O-ring gantry swing, whereas C-VMAT and NC-VMAT used coplanar and noncoplanar 2-arc beams, respectively. Dosimetric parameters, normal tissue complication probability, and delivery times were compared pairwise using the Wilcoxon signed-rank test with Bonferroni correction. Results: For high-risk planning target volume (PTV), D98 values in NC-VMAT plans were closest to the prescribed dose, significantly differing from C-VMAT and DSA plans. DSA plans showed significantly better median conformity and homogeneity indices (0.97 and 7.33, respectively) compared to C-VMAT (0.95 and 8.36) and NC-VMAT (0.96 and 7.96) plans. DSA plans significantly reduced the mean ipsilateral/contralateral parotid gland dose by 5.78/6.93 and 2.88/1.56 Gy (median) compared to C-VMAT and NC-VMAT. NC-VMAT and DSA plans significantly decreased the mean oral cavity dose by 2.16 and 3.22 Gy (median) compared to C-VMAT. DSA plans had the lowest median normal tissue complication for xerostomia with significant differences, followed by NC-VMAT and C-VMAT. The delivery time for DSA plans was longer than VMAT (151 seconds vs 124 seconds), but shorter than NC-VMAT. Conclusions: DSA plans using OXRAY for HNSCC maintained PTV coverage while reducing parotid gland and oral cavity mean doses compared to coplanar VMAT plans, although delivery times increased. DSA plans reduced parotid gland doses and delivery times compared to noncoplanar VMAT plans. |
| format | Article |
| id | doaj-art-4fb881a761d541ee8ecbb6498e9e60cd |
| institution | Kabale University |
| issn | 2452-1094 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
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| series | Advances in Radiation Oncology |
| spelling | doaj-art-4fb881a761d541ee8ecbb6498e9e60cd2025-01-23T05:27:22ZengElsevierAdvances in Radiation Oncology2452-10942025-03-01103101706Dosimetric Comparison of Noncoplanar VMAT Without Rotating the Patient Couch Versus Conventional Coplanar/Noncoplanar VMAT for Head and Neck Cancer: First Report of Dynamic Swing ArcKouta Hirotaki, MS0Kento Tomizawa, MD, PhD1Satoe Kitou, BS2Shunta Jinno, MS3Shunsuke Moriya, PhD4Takeshi Fujisawa, MD5Sadamoto Zenda, MD, PhD6Takeji Sakae, PhD7Masashi Ito, BS8Doctoral Program in Medical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan; Department of Radiological Technology, National Cancer Center Hospital East, Chiba, JapanDepartment of Radiation Oncology, National Cancer Center Hospital East, Kashiwa, Japan; Corresponding author: Kento Tomizawa, MD, PhDDepartment of Radiological Technology, National Cancer Center Hospital East, Chiba, JapanHealthcare Business Group, Hitachi High-Tech Corporation, Tokyo, JapanFaculty of Medicine, University of Tsukuba, Ibaraki, JapanDepartment of Radiation Oncology, National Cancer Center Hospital East, Kashiwa, Japan; Division of Radiation Oncology and Particle Therapy, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Kashiwa, JapanDepartment of Radiation Oncology, National Cancer Center Hospital East, Kashiwa, Japan; Division of Radiation Oncology and Particle Therapy, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Kashiwa, JapanFaculty of Medicine, University of Tsukuba, Ibaraki, JapanDepartment of Radiological Technology, National Cancer Center Hospital East, Chiba, JapanPurpose: This retrospective planning study aimed to verify the usefulness of a clinically available method, dynamic swing arc (DSA), a noncoplanar volumetric modulated arc therapy (VMAT) technique, of the new accelerator OXRAY for head and neck squamous cell carcinoma (HNSCC). We performed dosimetric comparisons between DSA and conventional coplanar/noncoplanar VMAT (C-VMAT/NC-VMAT) plans for HNSCC. Methods and Materials: We selected 32 patients with oropharyngeal and hypopharyngeal cancer treated with C-VMAT at National Cancer Center Hospital East between September 2018 and July 2023. DSA and C/NC-VMAT plans were generated using OXRAY and TrueBeam, respectively. DSA employed noncoplanar 2-arc beams with an O-ring gantry swing, whereas C-VMAT and NC-VMAT used coplanar and noncoplanar 2-arc beams, respectively. Dosimetric parameters, normal tissue complication probability, and delivery times were compared pairwise using the Wilcoxon signed-rank test with Bonferroni correction. Results: For high-risk planning target volume (PTV), D98 values in NC-VMAT plans were closest to the prescribed dose, significantly differing from C-VMAT and DSA plans. DSA plans showed significantly better median conformity and homogeneity indices (0.97 and 7.33, respectively) compared to C-VMAT (0.95 and 8.36) and NC-VMAT (0.96 and 7.96) plans. DSA plans significantly reduced the mean ipsilateral/contralateral parotid gland dose by 5.78/6.93 and 2.88/1.56 Gy (median) compared to C-VMAT and NC-VMAT. NC-VMAT and DSA plans significantly decreased the mean oral cavity dose by 2.16 and 3.22 Gy (median) compared to C-VMAT. DSA plans had the lowest median normal tissue complication for xerostomia with significant differences, followed by NC-VMAT and C-VMAT. The delivery time for DSA plans was longer than VMAT (151 seconds vs 124 seconds), but shorter than NC-VMAT. Conclusions: DSA plans using OXRAY for HNSCC maintained PTV coverage while reducing parotid gland and oral cavity mean doses compared to coplanar VMAT plans, although delivery times increased. DSA plans reduced parotid gland doses and delivery times compared to noncoplanar VMAT plans.http://www.sciencedirect.com/science/article/pii/S2452109424002690 |
| spellingShingle | Kouta Hirotaki, MS Kento Tomizawa, MD, PhD Satoe Kitou, BS Shunta Jinno, MS Shunsuke Moriya, PhD Takeshi Fujisawa, MD Sadamoto Zenda, MD, PhD Takeji Sakae, PhD Masashi Ito, BS Dosimetric Comparison of Noncoplanar VMAT Without Rotating the Patient Couch Versus Conventional Coplanar/Noncoplanar VMAT for Head and Neck Cancer: First Report of Dynamic Swing Arc Advances in Radiation Oncology |
| title | Dosimetric Comparison of Noncoplanar VMAT Without Rotating the Patient Couch Versus Conventional Coplanar/Noncoplanar VMAT for Head and Neck Cancer: First Report of Dynamic Swing Arc |
| title_full | Dosimetric Comparison of Noncoplanar VMAT Without Rotating the Patient Couch Versus Conventional Coplanar/Noncoplanar VMAT for Head and Neck Cancer: First Report of Dynamic Swing Arc |
| title_fullStr | Dosimetric Comparison of Noncoplanar VMAT Without Rotating the Patient Couch Versus Conventional Coplanar/Noncoplanar VMAT for Head and Neck Cancer: First Report of Dynamic Swing Arc |
| title_full_unstemmed | Dosimetric Comparison of Noncoplanar VMAT Without Rotating the Patient Couch Versus Conventional Coplanar/Noncoplanar VMAT for Head and Neck Cancer: First Report of Dynamic Swing Arc |
| title_short | Dosimetric Comparison of Noncoplanar VMAT Without Rotating the Patient Couch Versus Conventional Coplanar/Noncoplanar VMAT for Head and Neck Cancer: First Report of Dynamic Swing Arc |
| title_sort | dosimetric comparison of noncoplanar vmat without rotating the patient couch versus conventional coplanar noncoplanar vmat for head and neck cancer first report of dynamic swing arc |
| url | http://www.sciencedirect.com/science/article/pii/S2452109424002690 |
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