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Monte Carlo simulated corrections for beam commissioning measurements with circular and MLC shaped fields on the CyberKnife M6 System: a study including diode, microchamber, point scintillator, and synthetic microdiamond detectors

Monte Carlo simulation was used to calculate correction factors for output factor (OF), percentage depth-dose (PDD), and off-axis ratio (OAR) measurements with the CyberKnife M6 System. These include the first such data for the InCise MLC. Simulated detectors include diodes, air-filled microchambers...

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Bibliographic Details
Published in:Physics in medicine & biology 2017-02, Vol.62 (3), p.1076-1095
Main Authors: Francescon, P, Kilby, W, Noll, J M, Masi, L, Satariano, N, Russo, S
Format: Article
Language:English
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Summary:Monte Carlo simulation was used to calculate correction factors for output factor (OF), percentage depth-dose (PDD), and off-axis ratio (OAR) measurements with the CyberKnife M6 System. These include the first such data for the InCise MLC. Simulated detectors include diodes, air-filled microchambers, a synthetic microdiamond detector, and point scintillator. Individual perturbation factors were also evaluated. OF corrections show similar trends to previous studies. With a 5 mm fixed collimator the diode correction to convert a measured OF to the corresponding point dose ratio varies between  −6.1% and  −3.5% for the diode models evaluated, while in a 7.6 mm  ×  7.7 mm MLC field these are  −4.5% to  −1.8%. The corresponding microchamber corrections are  +9.9% to  +10.7% and  +3.5% to  +4.0%. The microdiamond corrections have a maximum of  −1.4% for the 7.5 mm and 10 mm collimators. The scintillator corrections are  15%, reducing to    dmax were  
ISSN:0031-9155
1361-6560
DOI:10.1088/1361-6560/aa5610