A direct sinogram correction method to reduce metal-related beam-hardening in computed tomography

Sung Min Lee, Taigyntuya Bayaraa, Hosan Jeong, Chang Min Hyun, Jin Keun Seo

Research output: Contribution to journalArticle

Abstract

This paper proposes a direct sinogram correction method that does not require metal segmentation and prior knowledge to reduce metal-related artifacts in polychromatic computerized tomography (CT). The metal-related artifacts, being common in dental conebeam CT images, are caused by beam hardening-induced sinogram inconsistency associated with complicated metal-bone-tissue interactions and other factors including scattering. This paper carefully analyzed artifact-causing factors and developed a direct method for sinogram correction to reduce the mismatch between sinogram data and the mathematical model for CT reconstruction. The proposed method attempts to project the beam-hardening affected data to the range space of the Radon transform so that the mathematical model is more consistent with the corrected data, with keeping a part of data where beam hardening effects are small. We tested the performance of the proposed method in numerical simulations and experiments using dental conebeam CT. The results demonstrate that the proposed method successfully reduces beam-hardening artifacts.

Original languageEnglish
Article number8825822
Pages (from-to)128828-128836
Number of pages9
JournalIEEE Access
Volume7
DOIs
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)

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