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

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)192-201
Number of pages10
JournalRadiological Physics and Technology
Volume11
Issue number2
DOIs
Publication statusPublished - 2018 Jun 1

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photon beams
Photons
cones
Ions
Water
output
detectors
simulation
chambers
ionization chambers
collimators
diodes
water

Keywords

  • Dosimetry
  • Monte Carlo
  • Small field
  • SRS

ASJC Scopus subject areas

  • Radiation
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Radiology Nuclear Medicine and imaging

Cite this

Output factor determination based on Monte Carlo simulation for small cone field in 10-MV photon beam. / Fukata, Kyohei; Sugimoto, Satoru; Kurokawa, Chie; Saito, Akito; Inoue, Tatsuya; Sasai, Keisuke.

In: Radiological Physics and Technology, Vol. 11, No. 2, 01.06.2018, p. 192-201.

Research output: Contribution to journalArticle

Fukata, Kyohei ; Sugimoto, Satoru ; Kurokawa, Chie ; Saito, Akito ; Inoue, Tatsuya ; Sasai, Keisuke. / Output factor determination based on Monte Carlo simulation for small cone field in 10-MV photon beam. In: Radiological Physics and Technology. 2018 ; Vol. 11, No. 2. pp. 192-201.
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