Technical note: Overprediction of dose with default PRESTA-I boundary crossing in DOSXYZnrc and BEAMnrc

Use of the PRESTA-I (current default) boundary crossing algorithm for charged particles in DOSXYZnrc and BEAMnrc is shown to result in dose overprediction by up to 2.5% in photon and electron beams (less in high-energy electron beams). The effect is most pronounced when charged particle equilibrium...

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Veröffentlicht in:	Medical physics (Lancaster) 2007-02, Vol.34 (2), p.647-650
Hauptverfasser:	Walters, B. R. B., Kawrakow, I.
Format:	Artikel
Sprache:	eng
Schlagworte:	accurate dose calculations ALGORITHMS Alternating current power transmission Ancillary equipment Charged particle spectroscopy CHARGED PARTICLES Computer Simulation DOSIMETRY Dosimetry/exposure assessment EGSnrc ELECTRON BEAMS Electron scattering Electronic transport Field size Ionization chambers Models, Biological Parallel processing PHANTOMS PHOTON BEAMS Photons Protons - therapeutic use RADIATION DOSES radiation therapy RADIOLOGY AND NUCLEAR MEDICINE Radiometry - methods RADIOTHERAPY Radiotherapy Dosage Radiotherapy Planning, Computer-Assisted - methods Radiotherapy, High-Energy - methods Reproducibility of Results SCATTERING Sensitivity and Specificity Software Software Validation
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Beschreibung
Zusammenfassung:	Use of the PRESTA-I (current default) boundary crossing algorithm for charged particles in DOSXYZnrc and BEAMnrc is shown to result in dose overprediction by up to 2.5% in photon and electron beams (less in high-energy electron beams). The effect is most pronounced when charged particle equilibrium does not exist or when the phantom is not divided into uniform voxels throughout. As a result, the default boundary crossing algorithm in BEAMnrc will be changed to “exact” (single scattering).
ISSN:	0094-2405 2473-4209
DOI:	10.1118/1.2402342