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An iterative approach to the beam hardening correction in cone beam CT. Med Phys 2000 Jan;27(1):23-9

Date

02/05/2000

Pubmed ID

10659734

DOI

10.1118/1.598853

Scopus ID

2-s2.0-0033983855   198 Citations

Abstract

In computed tomography (CT), the beam hardening effect has been known to be one of the major sources of deterministic error that leads to inaccuracy and artifact in the reconstructed images. Because of the polychromatic nature of the x-ray source used in CT and the energy-dependent attenuation of most materials, Beer's law no longer holds. As a result, errors are present in the acquired line integrals or measurements of the attenuation coefficients of the scanned object. In the past, many studies have been conducted to combat image artifacts induced by beam hardening. In this paper, we present an iterative beam hardening correction approach for cone beam CT. An algorithm that utilizes a tilted parallel beam geometry is developed and subsequently employed to estimate the projection error and obtain an error estimation image, which is then subtracted from the initial reconstruction. A theoretical analysis is performed to investigate the accuracy of our methods. Phantom and animal experiments are conducted to demonstrate the effectiveness of our approach.

Author List

Hsieh J, Molthen RC, Dawson CA, Johnson RH

Author

Roger H. Johnson PhD Associate Professor in the Biophysics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Algorithms
Animals
Biophysical Phenomena
Biophysics
Humans
Image Processing, Computer-Assisted
Lung
Phantoms, Imaging
Rats
Tomography, X-Ray Computed