CT image correction for beam hardening using simulated projection data

Author

Meagher, J.M. ; Mote, C.D., Jr. ; Skinner, H.B.

Author_Institution

Dept. of Mech. Eng., California Polytech. State Univ., San Luis Obispo, CA, USA

Volume

37

Issue

4

fYear

1990

fDate

8/1/1990 12:00:00 AM

Firstpage

1520

Lastpage

1524

Abstract

A general beam-hardening correction technique is presented. Knowledge of the CT (computerized tomography) scanner X-ray spectrum is necessary. This postreconstruction method does not require the original projection data. Simulated projections through an uncorrected reconstructed image are used to correct for beam hardening. Errors in the mean linear attenuation coefficient are decreased from 30% to 5% with virtual elimination of the visual streaking artifact. The theoretical image improvement equals that of projection linearization postreconstruction methods using the original projection data. The correction is limited to cases where the material causing the beam hardening is contained within the reconstruction space

Keywords

computerised picture processing; computerised tomography; digital simulation; X-ray spectrum; beam hardening; computerized tomography; errors; image correction; image improvement; mean linear attenuation coefficient; postreconstruction method; simulated projection data; visual streaking; Attenuation; Biological tissues; Bones; Composite materials; Computed tomography; Head; Image reconstruction; Polynomials; Structural beams; X-ray imaging;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.55865

Filename

55865