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Monte Carlo simulated correction factors for output factor measurement with the CyberKnife system—results for new detectors and correction factor dependence on measurement distance and detector orientation This content has been downloaded from IOPscience. Please scroll down to see the full text. 2014 Phys. Med. Biol. 59 N11 (http://iopscience.iop.org/0031-9155/59/6/N11) View the table of contents for this issue, or go to the journal homepage for more
Download details: IP Address: 81.118.214.164 This content was downloaded on 06/03/2014 at 16:13
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Institute of Physics and Engineering in Medicine Phys. Med. Biol. 59 (2014) N11–N17
Physics in Medicine and Biology
doi:10.1088/0031-9155/59/6/N11
Note
Monte Carlo simulated correction factors for output factor measurement with the CyberKnife system—results for new detectors and correction factor dependence on measurement distance and detector orientation P Francescon 1 , W Kilby 2 and N Satariano 1 1 2
Department of Medical Physics, ULSS6-36100, Vicenza, Italy Accuray Incorporated, 1310 Chesapeake Terrace, Sunnyvale, CA 94089, USA
E-mail:
[email protected] Received 8 November 2013, revised 9 January 2014 Accepted for publication 21 January 2014 Published 5 March 2014 Abstract
A previous study of the corrections needed for output factor measurements with the CyberKnife system has been extended to include new diode detectors (IBA SFD and Exradin D1V), an air filled microchamber (Exradin CC01) and a scintillation detector (Exradin W1). The dependence of the corrections on detector orientation (detector long axis parallel versus perpendicular to the beam axis) and source to detector distance (SDD) was evaluated for these new detectors and for those in our previous study. The new diodes are found to over-respond at the smallest (5 mm) field size by 2.5% (D1V) and 3.3% (SFD) at 800 mm SDD, while the CC01 under-responds by 7.4% at the same distance when oriented parallel to the beam. Corrections for all detectors tend to unity as field size increases. The W1 corrections are
