X-ray computed tomography for structural ceramic applications: beam hardening corrections: 39102 Ellingson, W.A.; Segal, E.; Vannier, M.W. Argonne National Laboratory, Argonne, Illinois (United States), ANL-87-24, DE88-005891, 29 pp. (May 1987)

Abstract

Beam hardening (BH), caused by the energy dependence of x-ray attenuation in materials, reduces the reliability of images generated by computed tomographic (CT) when polychromatic x-ray sources are used. The magnitude of the BH effect was calculated, and four different approaches to BH correction for CT imaging of ceramics were investigated: the ''water bag'' approach, pre-hardening of the beam by use of a filter, linearization correction, and dual-energy methods. The dual-energy approach appears to be a promising means of BH correction for CT imaging of ceramics.