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Original Article

Korean Journal of Medical Physics 2009; 20(2): 106-111

Published online June 25, 2009

Copyright © Korean Society of Medical Physics.

Determination of Phantom Scatter Factors for Small Photon Fields

소조사면 광자선의 팬톰산란인수 결정

Young-Kee Oh, Tae-Jin Choi*, Jin-Hee Kim, Ok-Bae Kim

오영기■최태진*■김진희■김옥배

Departments of Radiation Oncology, *Medical Engineering, Keimyung University Dongsan Medical Center, Deagu, Korea

계명대학교 동산의료원 방사선종양학과, *의공학과

Abstract

Total scatter factor (Scp), head scatter factor (Sc) and phantom scatter factor (Sp) are very important for accurate radiation therapy at stereotactic radiosurgery (SRS) with irregular field shape using micro-MLC and intensity modulated radiation therapy (IMRT) including many small field sizes. In this study we measured and compared Scp with reference ion chamber, pinpoint chamber and diode detector and adapted the resuls form diode detector. Head scatter factors for small field sizes were also measured with diode detector covered 1.5 cm-thick solid water build-up cap. Some errors like as electron contamination of 1∼3% were included in the values of Sc but trend of total results of Sc was coincided with basic theory. Phantom scatter factors for small field sizes were calculated form Scp and Sc. The results of Sp were compared and were well-agreed with those of other authors.

KeywordsSmall field size, Output factor, Head scatter factor, Phantom scatter factor

Korean Society of Medical Physics

Vol.35 No.1
March 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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