Fast new simulation of x-ray signals for arbitrary geometries

Author:

Wang Xinlei,Joy David C.

Abstract

The Bremsstrahlung spectrum from a bulk specimen has been successfully studied with high accuracy by Monte Carlo techniques. However, such procedures take considerable computing time since any change of experimental parameters requires a fresh computation. This paper describes an alternative approach which allows x-ray signals for a given structure to be computed within a fraction of a second. The method is illustrated here by an application to Bremsstrahlung. The procedure used is that of a diffusion matrix in which the strength of individual diffusion sources is derived by an initial Monte Carlo computation.The grid of a diffusion matrix Φ(yi,zj,Ek) which is established by Monte Carlo simulation contains the intensity of Bremsstrahlung x-ray coordinated at yi,zj with the photon energy of Ek. In the simplest case the matrix can be computed so that any photon crossing all the cells is accumulated. The results are stored in a 20×40×30 matrix for -R<zj<R and 0<yiR in steps of R/20 where R is the Bethe electron range, and 0<Ek<E0 in steps of E0/30. The accuracy of the matrix depends on the quality of the Monte Carlo simulation used to generate it.

Publisher

Cambridge University Press (CUP)

Subject

General Medicine

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