X-ray CT metal artifact reduction using wavelet domain L0 sparse regularization

Abolfazl Mehranian, Mohammad Reza Ay, Arman Rahmim, Habib Zaidi

Research output: Contribution to journalArticle

Abstract

X-ray computed tomography (CT) imaging of patients with metallic implants usually suffers from streaking metal artifacts. In this paper, we propose a new projection completion metal artifact reduction (MAR) algorithm by formulating the completion of missing projections as a regularized inverse problem in the wavelet domain. The Douglas-Rachford splitting (DRS) algorithm was used to iteratively solve the problem. Two types of prior information were exploited in the algorithm: 1) the sparsity of the wavelet coefficients of CT sinograms in a dictionary of translation-invariant wavelets and 2) the detail wavelet coefficients of a prior sinogram obtained from the forward projection of a segmented CT image. A pseudo-L0 synthesis prior was utilized to exploit and promote the sparsity of wavelet coefficients. The proposed L 0-DRS MAR algorithm was compared with standard linear interpolation and the normalized metal artifact reduction (NMAR) approach proposed by Meyer using both simulated and clinical studies including hip prostheses, dental fillings, spine fixation and electroencephalogram electrodes in brain imaging. The qualitative and quantitative evaluations showed that our algorithm substantially suppresses streaking artifacts and can outperform both linear interpolation and NMAR algorithms.

Original languageEnglish (US)
Article number6522894
Pages (from-to)1707-1722
Number of pages16
JournalIEEE Transactions on Medical Imaging
Volume32
Issue number9
DOIs
StatePublished - 2013

Fingerprint

X Ray Computed Tomography
Artifacts
Tomography
Metals
X rays
Interpolation
Hip prostheses
Imaging techniques
Hip Prosthesis
Dental prostheses
Glossaries
Electroencephalography
Inverse problems
Neuroimaging
Brain
Tooth
Electrodes
Spine

Keywords

  • L sparse regularization
  • Metal artifact reduction (MAR)
  • streaking artifacts
  • wavelets
  • X-ray computed tomography (CT)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Radiological and Ultrasound Technology
  • Software

Cite this

X-ray CT metal artifact reduction using wavelet domain L0 sparse regularization. / Mehranian, Abolfazl; Ay, Mohammad Reza; Rahmim, Arman; Zaidi, Habib.

In: IEEE Transactions on Medical Imaging, Vol. 32, No. 9, 6522894, 2013, p. 1707-1722.

Research output: Contribution to journalArticle

Mehranian, Abolfazl ; Ay, Mohammad Reza ; Rahmim, Arman ; Zaidi, Habib. / X-ray CT metal artifact reduction using wavelet domain L0 sparse regularization. In: IEEE Transactions on Medical Imaging. 2013 ; Vol. 32, No. 9. pp. 1707-1722.
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