Seong Soo Shin1, Sohyun Ahn2, Seung-Hyup Baek3, Jungwon Kwak4, Jin Sung Kim2, Woo Sang Ahn5. 1. Department of Radiation Oncology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Republic of Korea. 2. Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea. 3. Department of Integrative Medicine, Yonsei University, Seoul, Republic of Korea. 4. Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea. 5. Department of Radiation Oncology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Republic of Korea; anidol@ulsan.ac.kr.
Abstract
BACKGROUND/AIM: To assess the dosimetric influence of a semi-cylindrical beam spoiler (sCBS) for the treatment of early glottic cancer using a 6 MV photon beam. PATIENTS AND METHODS: The 2D dose distributions were also calculated and measured with and without the sCBS and with a 0.5 cm thick bolus. A retrospective study of 8 patients treated between 2012 and 2018 was performed. RESULTS: The 2D dose distributions obtained from the treatment planning system (TPS) and film measurements were in good agreement. In the planning study, the V95%, V100%, conformal index (CI), and homogeneity index (HI) of all pPTVs for the sCBS plans were better than those for the open field plans (p<0.01). Especially, sCBS plans had better skin sparing effect than bolus plans (p<0.05). CONCLUSION: The sCBS of the 6 MV photon beam could be a useful tool for the treatment of early glottic cancers.
BACKGROUND/AIM: To assess the dosimetric influence of a semi-cylindrical beam spoiler (sCBS) for the treatment of early glottic cancer using a 6 MV photon beam. PATIENTS AND METHODS: The 2D dose distributions were also calculated and measured with and without the sCBS and with a 0.5 cm thick bolus. A retrospective study of 8 patients treated between 2012 and 2018 was performed. RESULTS: The 2D dose distributions obtained from the treatment planning system (TPS) and film measurements were in good agreement. In the planning study, the V95%, V100%, conformal index (CI), and homogeneity index (HI) of all pPTVs for the sCBS plans were better than those for the open field plans (p<0.01). Especially, sCBS plans had better skin sparing effect than bolus plans (p<0.05). CONCLUSION: The sCBS of the 6 MV photon beam could be a useful tool for the treatment of early glottic cancers.
Authors: Shu-Hui Hsu; Peter L Roberson; Yu Chen; Robin B Marsh; Lori J Pierce; Jean M Moran Journal: Phys Med Biol Date: 2008-04-25 Impact factor: 3.609
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