• Title/Summary/Keyword: Central electrode correction

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Monte Carlo study on the effect of reference depth change to the central electrode correction factor (기준깊이 변화에 따른 중심전극 보정인수(Pcel)변화)

  • Mln, Chul-Hee;Kim, Sung-Hun;Shin, Dong-Oh;Kim, Chan-Hyeong
    • Proceedings of the Korean Society of Medical Physics Conference
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    • 2004.11a
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    • pp.39-42
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    • 2004
  • The Central Electrode Correction Factor that corrects the effect due to the electrode being made of non-air material is base on the data from the depth of 5cm in water. But TG-51 protocol proposes the reference depth of 10cm in water. The purpose of this research is to check the alteration of Central Electrode Correction Factor due to the change of reference depth from 5cm to 10cm in water using Monte Carlo Computing Methods. The results showed that the change of Central Electrode Correction Factor is ignorable in the statistical errors of 2% for two different depth, 5cm and 10cm.

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Study on the Evaluation of TRS-398 Quality Factors with Central Electrode Corrections for Small Cylindrical Chambers (소형 전리함에 대한 TRS-398 선질인자 계산과 중심전극 보정에 관한 연구)

  • Kang, Yeong-Rok;Lee, Chang-Yeol;Kim, Jin-Ho;Moon, Young-Min;Kwak, Dong-Won;Kang, Sang-Koo;Kim, Jeung-Kee;Yang, Kwang-Mo;Jeong, Dong-Hyeok
    • Progress in Medical Physics
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    • v.22 no.3
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    • pp.148-154
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    • 2011
  • The quality factors ($k_{Q,Q_0}$) were evaluated by appling the results recently studied for the effect of central electrode in TRS-398 protocol. The PTW-31010 and IBA-CC13 chambers were used in this study. The quality factors were calculated as a function of beam quality for high energy electron and photon beams and compared with data currently used in TRS-398 protocol. In the PTW-31010 chamber using aluminium electrode, appling the new central electrode collections, the quality factors were 0.4% and 0.9% higher than current TRS-398 data for high energy photon and electron beams respectively. In the IBA-CC13 chamber using C-552 electrode, there are no variations in quality factors compared to TRS-398 data currently used.