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System and method for radiation dose calculation within sub-volumes of a monte carlo based particle transport grid

United States Patent

6,148,272
November 14, 2000
View the Complete Patent at the US Patent & Trademark Office
Lawrence Livermore National Laboratory - Visit the Industrial Partnerships Office Website
A system and method is disclosed for radiation dose calculation within sub-volumes of a particle transport grid. In a first step of the method voxel volumes enclosing a first portion of the target mass are received. A second step in the method defines dosel volumes which enclose a second portion of the target mass and overlap the first portion. A third step in the method calculates common volumes between the dosel volumes and the voxel volumes. A fourth step in the method identifies locations in the target mass of energy deposits. And, a fifth step in the method calculates radiation doses received by the target mass within the dosel volumes. A common volume calculation module inputs voxel volumes enclosing a first portion of the target mass, inputs voxel mass densities corresponding to a density of the target mass within each of the voxel volumes, defines dosel volumes which enclose a second portion of the target mass and overlap the first portion, and calculates common volumes between the dosel volumes and the voxel volumes. A dosel mass module, multiplies the common volumes by corresponding voxel mass densities to obtain incremental dosel masses, and adds the incremental dosel masses corresponding to the dosel volumes to obtain dosel masses. A radiation transport module identifies locations in the target mass of energy deposits. And, a dose calculation module, coupled to the common volume calculation module and the radiation transport module, for calculating radiation doses received by the target mass within the dosel volumes.
Bergstrom; Paul M. (Livermore, CA), Daly; Thomas P. (Livermore, CA), Moses; Edward I. (Livermore, CA), Patterson, Jr.; Ralph W. (Livermore, CA), Schach von Wittenau; Alexis E. (Livermore, CA), Garrett; Dewey N. (Livermore, CA), House; Ronald K. (Tracy, CA), Hartmann-Siantar; Christine L. (Livermore, CA), Cox; Lawrence J. (Los Alamos, NM), Fujino; Donald H. (San Leandro, CA)
The Regents of the University of California (Oakland, CA)
09/ 238,297
January 28, 1999
The United States Government has rights in this invention pursuant to Contract No. W-7405-ENG-48 between the United States Department of Energy and the University of California for the operation of Lawrence Livermore National Laboratory.