抄録
The difficulty of measuring output factor (OPF) in a small field has been frequently discussed in recent publications. This study is aimed to determine the OPF in a small field using 10-MV photon beam and stereotactic conical collimator (cone). The OPF was measured by two diode detectors (SFD, EDGE detector) and one micro-ion chamber (PinPoint 3D chamber) in a water phantom. A Monte Carlo simulation using simplified detector model was performed to obtain the correction factor for the detector measurements. About 12% OPF difference was observed in the measurement at the smallest field (7.5 mm diameter) for EDGE detector and PinPoint 3D chamber. By applying the Monte Carlo-based correction factor to the measurement, the maximum discrepancy among the three detectors was reduced to within 3%. The results indicate that determination of OPF in a small field should be carefully performed. Especially, detector choice and appropriate correction factor application are very important in this regard.
本文言語 | English |
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ページ(範囲) | 192-201 |
ページ数 | 10 |
ジャーナル | Radiological Physics and Technology |
巻 | 11 |
号 | 2 |
DOI | |
出版ステータス | Published - 2018 6月 1 |
ASJC Scopus subject areas
- 放射線
- 理学療法、スポーツ療法とリハビリテーション
- 放射線学、核医学およびイメージング