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. 2015 Nov 8;16(6):51–64. doi: 10.1120/jacmp.v16i6.5391

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© 2015 The Authors.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Schematic diagram of the LLUMC Gantry 1 treatment nozzle with radiosurgery cone geometry used in Monte Carlo simulations. From left to right the components are: the secondary emission monitor (SEM) and titanium exit window, multiwire ion chamber (MWIC), initial scatterer (two lead wedges) (S1), first proton transmission ionization chamber (pTIC1), first steel fixed aperture (FA1), second pTIC2, second fixed aperture (FA2), Perspex modulation wheel, third fixed aperture (FA3), multielement transmission ion chamber (MTIC), brass precollimator (PCOL), ridge filter (RFIL), and radiosurgery cone (RSC).