Effect of the collimator angle on dosimetric verification of volumetric modulated arc therapy

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• 作者：Yong Ho Kim ; Ha Ryung Park ; Won Taek Kim…
• 关键词：VMAT ; Patient specific QA ; Collimator angle
• 刊名：Journal of the Korean Physical Society
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：67
• 期：1
• 页码：243-247
• 全文大小：675 KB
• 参考文献：[1]F. K. Lee, C. W. Yip, F. C. Cheung, A. K. Leung, R. M. Chau and R. K. Ngan, Med. Dosim. 39, 44 (2014).View Article
  [2]M. W. K. Kan, W. Wong, L. H. T. Leung, P. K. N. Yu, R. W. K. So and A. C. K. Cheong, J. Appl. Clin. Medi. Phys. 13, 6 (2012).
  [3]S. A. Syam Kumar, R. Holla, P. Sukumar, S. Padmanaban and N. Vivekanandan, Rep. Pract. Oncol. Radiother. 8, 87 (2013).View Article
  [4]A. Holt, D. V. Gestel, M. P. Arends, E. W. Korevaar, D. Schuring, M. C. Kunze-Busch, R. JW. Louwe and C. Vliet-Vroegindeweij, Radiat. Oncol. 8, 26 (2013).View Article
  [5]J. Alvarez-Moret, F. Pohl, O. Koelbl and B. Dobler, Raiat. Oncol. 5, 110 (2010).View Article
  [6]T. Lee, P. Chao, H. Ting, S. Lo, Y. Wang, C. Tuan, F. Fang and T. Su, J. Appl. Clin. Medi. Phys. 12, 4 (2011).
  [7]X. Jin, J. Yi, Y. Zhou, H. Yan, C. Han and C. Xie, Med. Dosim. 38, 418 (2013).View Article
  [8]J. Herzen, M. Todorovic, F. Cremers, V. Platz, D. Albers, A. Bartels and R. Schmidt, Phys. Med. Biol. 52, 1197 (2007).View Article
  [9]L. D. Wolfsberger, M. Wagar, P Nitsch, M. S. Bhagwat and P. Zygmanski, J. Appl. Clin. Medi. Phys. 11, 1 (2010).
  [10]M. Rao, W. Yang, F. Chen, K. Sheng, J. Ye, V. Mehta, D. Shepard and D. Cao, Med. Phys. 37, 1350 (2010)View Article
  [11]S. Korreman, J. Medin and F. Kjaer-Kristoffersen, Acta Oncologica. 45, 185 (2009)View Article
  [12]M. Stasi, S. Bresciani, A. Miranti, A. Maggio, V. Sapino and P. Gabriele, Med. Phys. 39, 7626 (2012).View Article
  [13]G. A. Ezzell et al., Med. Phys. 36, 5359 (2009).View Article
  [14]C. C. Ling, P. Zhang, Y. Archambault, J. Bocanek, G. Tang, M. Phil and T. Losasso, Int. J. Radiat. Oncol. Biol. Phys. 72, 575 (2008).View Article
  [15]M. Okumura, Y. Obata, K. Shimomura, M. Tamura and Y. Nishimura, Phys. Med. Biol. 55, 3101 (2010).View Article
  
• 作者单位：Yong Ho Kim (1)
  Ha Ryung Park (1)
  Won Taek Kim (1)
  Dong Won Kim (1)
  Yongkan Ki (1)
  Juhye Lee (1)
  Jinsuk Bae (1)
  Dahl Park (1)
  Hosang Jeon (2)
  Ji Ho Nam (2)
  
  1. Department of Radiation Oncology, Pusan National University School of Medicine, Biomedical Research Institute, Pusan National University Hospital, Busan, 602-739, Korea
  2. Department of Radiation Oncology, Pusan National University Yangsan Hospital, Yangsan, 626-770, Korea
  
• 刊物主题：Physics, general; Theoretical, Mathematical and Computational Physics; Particle and Nuclear Physics;
• 出版者：Springer Netherlands
• ISSN：1976-8524

文摘

The collimator is usually rotated when planning volumetric modulated arc therapy (VMAT) due to the leakage of radiation between the multi-leaf collimator (MLC) leaves. We studied the effect of the collimator angle on the results of dosimetric verification of VMAT plans for head and neck patients. We studied VMAT plans for 10 head and neck patients. We made two sets of VMAT plans for each patient. Each set was composed of 10 plans with collimator angles of 0, 5, 10, 15, 20, 25, 30, 35, 40, 45 degrees. Plans in the first set were optimized individually, and plans in the second set shared the 30-degree collimator-angle optimization. The two sets of plans were verified by using the 2-dimensional ion chamber array MatriXX (IBA Dosimetry, Germany). The comparisons between the calculation and the measurements were made by using a γ-index analysis. The γ-index (2%/2 mm) and (3%/3 mm) passing rates had negative correlations with the collimator angle. The maximum difference between γ-index (3%/3 mm) passing rates of different collimator angles for each patient ranged from 1.46% to 5.60% with an average of 3.67%. There were significant differences (maximum 5.6%) in the passing rates for different collimator angles. The results suggested that the accuracy of the delivered dose depended on the collimator angle. These findings are informative when choosing a collimator angle for VMAT plans.