Sparsity constrained sinogram inpainting for metal artifact reduction in x-ray computed tomography

A. Mehranian, M. R. Ay, A. Rahmim, H. Zaidi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we proposed a new projection completion metal artifact reduction (MAR) algorithm in x-ray computed tomography (CT) using a sparsity based sinogram inpainting (interpolation) technique. We developed the MAR algorithm on a Bayesian framework in which a wavelet-based generalized Gaussian (ℓp) prior was applied and then the inpainting problem was formulated as a constrained optimization problem. For the optimization, we derived a projected gradient descent algorithm using a majorization-minimization technique. The gradient step was performed by a soft thresholding operator for an ℓ1 prior, and a hard thresholding with a decaying threshold for an ℓ0 prior. We utilized a tight frame of translation-invariant wavelets implemented by undecimated discrete wavelet transform. As in the clinical setting there is no ground truth CT image to objectively evaluate the performance of a proposed MAR algorithm, we also introduced a novel approach to simulate metal artifacts in a real CT dataset. The results showed that the proposed MAR algorithm using hard thresholding efficiently recovers and inpaints the sinogram projections corrupted by metallic implants.

Original languageEnglish (US)
Title of host publication2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3694-3699
Number of pages6
ISBN (Print)9781467301183
DOIs
StatePublished - Jan 1 2011
Event2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011 - Valencia, Spain
Duration: Oct 23 2011Oct 29 2011

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Other

Other2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
CountrySpain
CityValencia
Period10/23/1110/29/11

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

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    Mehranian, A., Ay, M. R., Rahmim, A., & Zaidi, H. (2011). Sparsity constrained sinogram inpainting for metal artifact reduction in x-ray computed tomography. In 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011 (pp. 3694-3699). (IEEE Nuclear Science Symposium Conference Record). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/NSSMIC.2011.6153697