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Superficial Dosimetry for Helical Tomotherapy

Other Titles
 토모테라피를 이용한 표면 치료 계획과 선량 분석 
Authors
 Song Yih Kim  ;  Sei Hwan You  ;  Taesoo Song  ;  Yong Nam Kim  ;  Ki Chang Keum  ;  Jae Ho Cho  ;  Chang Geol Lee  ;  Jinsil Seong 
Citation
 Journal of the Korean Society for Therapeutic Radiology and Oncology (대한방사선종양학회지), Vol.27(2) : 103-110, 2009 
Journal Title
 Journal of the Korean Society for Therapeutic Radiology and Oncology (대한방사선종양학회지) 
ISSN
 1229-8719 
Issue Date
2009
Keywords
Helical tomotherapy ; Tangential beam ; Skin dose ; Surface dose ; Cheese phantom
Abstract
Purpose To investigate the feasibility of helical tomotherapy on a wide curved area of the skin, and its accuracy in calculating the absorbed dose in the superficial region. Materials and Methods Two types of treatment plans were made with the cylinder-shaped 'cheese phantom'. In the first trial, 2 Gy was prescribed to a 1-cm depth from the surface. For the other trial, 2 Gy was prescribed to a 1-cm depth from the external side of the surface by 5 mm. The inner part of the phantom was completely blocked. To measure the surface dose and the depth dose profile, an EDR2 film was inserted into the phantom, while 6 TLD chips were attached to the surface. Results The film indicated that the surface dose of the former case was 118.7 cGy and the latter case was 130.9 cGy. The TLD chips indicated that the surface dose was higher than these, but it was due to the finite thickness of the TLD chips. In the former case, 95% of the prescribed dose was obtained at a 2.1 mm depth, while the prescribed does was at 2.2 mm in the latter case. The maximum dose was about 110% of the prescribed dose. As the depth became deeper, the dose decreased rapidly. Accordingly, at a 2-cm depth, the dose was 20% of the prescribed dose. Conclusion Helical tomotherapy could be a useful application in the treatment of a wide area of the skin with curvature. However, for depths up to 2 mm, the planning system overestimated the superficial dose. For shallower targets, the use of a compensator such as a bolus is required
Files in This Item:
T200903082.pdf Download
DOI
10.3857/jkstro.2009.27.2.103
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Radiation Oncology (방사선종양학교실) > 1. Journal Papers
Yonsei Authors
Keum, Ki Chang(금기창) ORCID logo https://orcid.org/0000-0003-4123-7998
Kim, Yong Nam(김용남)
Seong, Jin Sil(성진실) ORCID logo https://orcid.org/0000-0003-1794-5951
Lee, Chang Geol(이창걸) ORCID logo https://orcid.org/0000-0002-8702-881X
Cho, Jae Ho(조재호) ORCID logo https://orcid.org/0000-0001-9966-5157
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/104655
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