publication . Article . Other literature type . 2009

Rayleigh scatter in kilovoltage x-ray imaging: is the independent atom approximation good enough?

Name: Rayleigh scatter in kilovoltage x-ray imaging: is the independent atom approximation good enough?
Keywords: Radiological and Ultrasound Technology, Radiology Nuclear Medicine and imaging

Steve Webb; G Poludniowski; Philip M. Evans;

Open Access

Published: 21 Nov 2009 Journal: Physics in Medicine and Biology, volume 54, pages 6,931-6,942 (issn: 0031-9155, eissn: 1361-6560,

Publisher: IOP Publishing

Country: United Kingdom

Summary

Abstract

Monte Carlo simulation is the gold standard method for modelling scattering processes in medical x-ray imaging. General-purpose Monte Carlo codes, however, typically use the independent atom approximation (IAA). This is known to be inaccurate for Rayleigh scattering, for many materials, in the forward direction. This work addresses whether the IAA is sufficient for the typical modelling tasks in medical kilovoltage x-ray imaging. As a means of comparison, we incorporate a more realistic 'interference function' model into a custom-written Monte Carlo code. First, we conduct simulations of scatter from isolated voxels of soft tissue, adipose, cortical bone and spo...

doi: 10.1088/0031-9155/54/22/012

Subjects

free text keywords: Radiological and Ultrasound Technology, Radiology Nuclear Medicine and imaging, Data set, Scattering, Physics, Voxel, computer.software_genre, computer, Interference (wave propagation), Cylinder, Optics, business.industry, business, Rayleigh scattering, symbols.namesake, symbols, Monte Carlo method, Hounsfield scale

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