Download Citation on ResearchGate | On Jan 1, , D. W.O. Rogers and others published BEAMnrc users manual }. BEAMnrc: software tool to model radiation beams. BEAMnrc is now part of EGSnrc. Report a problem or mistake on this page. Please select all. BEAMnrc, DOSXYZnrc and BEAMDP GUI users manual.
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manul When photon splitting was used together with the other techniques, only the cases with improved photon and electron fluence were considered, i. All MC simulations were performed on a 2. An investigation of the influence of different photon and bremsstrahlung cross-section data available in BEAMnrc on the accuracy of calculated fluence and dose distributions. The efficiency of BEAMnrc PHSP simulations is significantly improved, with directional bremsstrahlung splitting combined with augmented charged particle range rejection, for the two field sizes studied.
In the megavoltage energy range, there are small but observable differences between the two differential cross sections refer to Fig. Medical Physics, Windsor,pp. The percentage difference between measured and a selection manhal MC calculated central-axis dose profiles is also shown. Estimates of the uncertainty using a significant number of bins e.
Data Tables 35 3— With SBS, the value of NBRSPL is changed in order to maximize the splitting of photons aimed into the field and to minimize unnecessary splitting of photons aimed away from the field.
BEAMnrc: software tool to model radiation beams
Monte Carlo transport parameters Maximum electron step, smax cm 10 Maximum electron loss per step MeV 0. Data Tables 7 6— Data Tables 20 2— ; This efficiency gain is achieved through the use of variance reduction techniques and faster mwnual of the electron transport.
The current version of BEAMnrc allows the user to choose three different photon cross sections: The boundary crossing algorithm together with the electron transport algorithm constitutes the condensed history technique used by a particular MC code system. The major advantage of using aggressive VRTs is the significant improvement in calculation time without a compromise in the accuracy of the patient dose computation.
Support Center Support Center. The parameter values chosen for the different techniques are recommendations from previous published works 1930 or are considered to be reasonable estimates, based on information from the BEAMnrc developers. The uncertainty was calculated in five different ways, i. Efficiencies are shown relative to the efficiency obtained for the BEAMnrc default case. For a particular efficiency enhancing technique used in BEAMnrcthe difference between the relative efficiencies obtained using the various estimates of the uncertainty increases as one changes from planar fluence to spectral distribution; this situation is clearly more evident for the larger field size see Figs.
A 3— There is another viewpoint concerning PHSP simulations of the linac treatment head, which should be considered. It has been reported that this option increases the efficiency of homogeneous phantom calculations, 38 however, no photon splitting or charged particle range rejection were employed.
BEAMnrc, DOSXYZnrc and BEAMDP GUI users manual – NRC Publications Archive –
The percentage difference between the two MC calculations is also shown. The use of sophisticated variance reduction and approximate efficiency improving techniques, combined with parallel processing in computer clusters and the continuing increase in computing power, will help make MC-based treatment planning a mainstay option in radiation oncology departments.
On manuxl other hand, the scattered photon can be forced to interact again in the forcing zone, depending on how many forced interactions are still available. Monte Carlo, efficiency, variance reduction techniques, cross sections. This is essential if one is considering real-time MC simulation of the treatment head and patient. VRTs do not change the physics and therefore do not bias the results.
The percentage difference between measured and a selection of MC calculated central and off-axis dose profiles is also shown.