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Radiological Physics and Technology

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04.04.2018

Output factor determination based on Monte Carlo simulation for small cone field in 10-MV photon beam

verfasst von: Kyohei Fukata, Satoru Sugimoto, Chie Kurokawa, Akito Saito, Tatsuya Inoue, Keisuke Sasai

Erschienen in: Radiological Physics and Technology | Ausgabe 2/2018

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Abstract

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.

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Titel: Output factor determination based on Monte Carlo simulation for small cone field in 10-MV photon beam
verfasst von: Kyohei Fukata
Satoru Sugimoto
Chie Kurokawa
Akito Saito
Tatsuya Inoue
Keisuke Sasai
Publikationsdatum: 04.04.2018
Verlag: Springer Singapore
Erschienen in: Radiological Physics and Technology / Ausgabe 2/2018
Print ISSN: 1865-0333
Elektronische ISSN: 1865-0341
DOI: https://doi.org/10.1007/s12194-018-0455-4

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Output factor determination based on Monte Carlo simulation for small cone field in 10-MV photon beam

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