Monte Carlo dose voxel kernel calculations of beta-emitting and Auger-emitting radionuclides for internal dosimetry: A comparison between EGSnrcMP and EGS4
- Laboratory of Medical Physics and Expert Systems, National Cancer Institute Regina Elena, Rome, 00144 (Italy)
Dose-point kernels (DPKs) can be widely applied to therapeutic nuclear medicine to obtain more accurate absorbed dose assessments in internal dosimetry assuming a spherical geometry. Recently, EGSnrc--the latest in the family of EGS Monte Carlo codes--has been tested for isotropic monoenergetic electrons and Y-90 beta spectrum in spherical geometry. The availability of SPECT images allows one to take into account heterogeneities in activity distribution within tumors, and to perform dose calculations using voxel dosimetry based on Monte Carlo simulations in a Cartesian geometry. The purpose of this study is to evaluate the differences of dose distributions scored in Cartesian voxels also known as Dose Voxel Kernels (DVKs) for five beta-emitting ({sup 131}I, {sup 89}Sr, {sup 153}Sm, {sup 186}Re, and {sup 90}Y) and Auger-emitting ({sup 111}In) radionuclides, when their computation is made using these two Monte Carlo codes from the same family to check if the new physics in EGSnrc simulation system produces DVK very different from those calculated with EGS4. We have calculated the DVKs for point and voxel sources in Cartesian scoring grids of different spatial resolutions. Our results for the point source, scored in the finer spatial resolution, show a poor agreement between EGSnrc and EGS4 (up to about 20%) for voxels closer to the origin, and a better agreement (below 5%) for longer distances for all radionuclides. For the voxel source, where doses were scored in the coarser spatial resolution, dose deposition in the central voxel is in good agreement for all the radionuclides; while surrounding voxels exhibit a slightly worse agreement.
- OSTI ID:
- 20853458
- Journal Information:
- Medical Physics, Vol. 33, Issue 9; Other Information: DOI: 10.1118/1.2266255; (c) 2006 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-2405
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BETA SPECTRA
COMPUTERIZED SIMULATION
DOSIMETRY
GEOMETRY
IMAGES
INDIUM 111
IODINE 131
MONTE CARLO METHOD
NEOPLASMS
POINT KERNELS
POINT SOURCES
RADIATION DOSE DISTRIBUTIONS
RADIATION DOSES
RADIOIMMUNOTHERAPY
RHENIUM 186
SAMARIUM 153
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
SPATIAL RESOLUTION
STRONTIUM 89
YTTRIUM 90