Computational science

Beam (structure)

Statistics

Visualization

Computer graphics (images)

Computed tomography

Set (abstract data type)

Computer science

Code (set theory)

Radiology

Imaging phantom

Hounsfield scale

Physics

Voxel

Simulation

Mathematics

Optics

Artificial intelligence

Monte Carlo method

Medicine

Programming language

Computer vision

DOSXYZnrc is an EGSnrc-based Monte Carlo simulation code for calculating dose distributions in a rectilinear voxel phantom and is based directly on the DOSXYZ code developed for the EGS4 code system (see NRC Report PIRS-509B). DOSXYZnrc is part of the OMEGABEAM system of codes developed at NRC. Density and material in every voxel may vary. A variety of beams may be incident on the phantom, including full phase-space files from BEAMnrc and beams characterized using Beam Characterization models. The companion program ctcreate is capable of reading in a CT data set of Hounsfield numbers and converting it into the information needed by DOSXYZnrc to simulate transport in a phantom (i.e. the appropriate material and density are specified in each voxel). Any of the available beams can be incident on this CT phantom. The code includes a restart facility and can be run on parallel computing platforms. The statistical analysis is based on a history by history method as opposed to the batch method used in DOSXYZ. This user’s manual covers general DOSXYZnrc inputs, geometries and outputs. It contains information on how to compile and run DOSXYZnrc using the EGSnrcMP system. It also describes the use of ctcreate. The figure on the front page shows a PAW visualisation of the isodose curves from a DOSXYZ simulation in which a Clinac 2100c 18MeV electron beam (simulated using a multiple-source model–with 35 million initial histories) was incident on the head and neck of a CT phantom. The visualisation was implemented by Daryoush Sheikh-Bagheri. NRCC Report PIRS-794(revB) 3

DOSXYZnrc Users Manual