MO-B-BRA-01: Clinical Implementation and Application of Monte Carlo in Photon and Electron Dose Calculations

2010 ◽  
Vol 37 (6Part14) ◽  
pp. 3336-3337
Author(s):  
J DeMarco ◽  
J Cygler
Keyword(s):  
Monte Carlo ◽  
Dose Calculations ◽  
Clinical Implementation ◽  
Electron Dose

Monte Carlo calculations of an Elekta Precise SL-25 photon beam model

2015 ◽  
pp. 1-12
Author(s):  
Fátima Padilla-Cabal ◽  
Mailyn Pérez-Liva ◽  
Elier Lara ◽  
Rodolfo Alfonso ◽  
Neivy Lopez-Pino
Keyword(s):  
Monte Carlo ◽  
Measurement Data ◽  
Dose Calculation ◽  
Photon Beam ◽  
Beam Model ◽  
Dose Calculations ◽  
Clinical Implementation ◽  
Dose Distributions ◽  
Major Barrier ◽  
Reconstruction Methods

AbstractBackgroundMonte Carlo (MC) simulations have been used extensively for benchmarking photon dose calculations in modern radiotherapy using linear accelerators (linacs). Moreover, a major barrier to widespread clinical implementation of MC dose calculation is the difficulty in characterising the radiation source using data reported from manufacturers.PurposeThis work aims to develop a generalised full MC histogram source model of an Elekta Precise SL-25 linac (electron exit window, target, flattening filter, monitor chambers and collimators) for 6 MV photon beams used in standard therapies. The inclusion of many different probability processes such as scatter, nuclear reactions, decay, capture cross-sections and more led to more realistic dose calculations in treatment planning and quality assurance.Materials and methodsTwo different codes, MCNPX 2·6 and EGSr-BEAM, were used for the calculation of particle transport, first in the geometry of the internal/external accelerator source, and then followed by tracking the transport and energy deposition in phantom-equivalent tissues. A full phase space file was scored directly above the upper multilayer collimator’s jaws to derive the beam characteristics such as planar fluence, angular distribution and energy spectrum. To check the quality of the generated photon beam, its depth dose curves and cross-beam profiles were calculated and compared with measured data.ResultsIn-field dose distributions calculated using the accelerator models were tuned to match measurement data with preliminary calculations performed using the accelerator information provided by the manufacturer. Field sizes of 3×3, 5×5, 10×10, 15×15 and 20×20 cm2were analysed. Local differences between calculated and measured curve doses beneath 2% were obtained for all the studied field sizes. Higher discrepancies were obtained in the air–water interface, where measurements of dose distributions with the ionisation chamber need to be shifted for the effective point of measurement.ConclusionThe agreements between MC-calculated and measured dose distributions were excellent for both codes, showing the strength and stability of the proposed model. Beam reconstruction methods as direct input to dose-calculation codes using the recorded histograms can be implemented for more accurate patient dose estimation.

scholarly journals Effects of Hounsfield number conversion on CT based proton Monte Carlo dose calculations

2007 ◽  
Vol 34 (4) ◽  
pp. 1439-1449 ◽  
Author(s):  
Hongyu Jiang ◽  
Joao Seco ◽  
Harald Paganetti
Keyword(s):  
Monte Carlo ◽  
Dose Calculations

Effect of using an initial polyenergetic spectrum with the pencil-beam redefinition algorithm for electron-dose calculations in water

1998 ◽  
Vol 25 (11) ◽  
pp. 2176-2185 ◽  
Author(s):  
Robert A. Boyd ◽  
Kenneth R. Hogstrom ◽  
Isaac I. Rosen
Keyword(s):  
Pencil Beam ◽  
Dose Calculations ◽  
Electron Dose

Accelerated Monte Carlo based dose calculations for brachytherapy planning using correlated sampling

2002 ◽  
Vol 47 (3) ◽  
pp. 351-376 ◽  
Author(s):  
Håkan Hedtjärn ◽  
Gudrun Alm Carlsson ◽  
Jeffrey F Williamson
Keyword(s):  
Monte Carlo ◽  
Dose Calculations ◽  
Correlated Sampling
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