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Adaptive sparse representation for MRI noise removal

Khalilzadeh, M. M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1142/S1016237212500342
  3. Publisher: World Scientific , 2012
  4. Abstract:
  5. Sparse representation is a powerful tool for image processing, including noise removal. It is an effective method for Gaussian noise removal by taking advantage of a fixed and learned dictionary. In this study, the variable distribution of Rician noise is reduced in magnetic resonance (MR) images by sparse representation based on reconstruction error sets. Standard deviation of Gaussian noise is used to find these errors locally. The proposed method represents two formulas for local error calculation using standard deviation of noise. The acquired results from the real and simulated images are comparable, and in some cases, better than the best Rician noise removal method due to the advantages of stability and low sensitivity to the parameters. Additionally, the devised algorithm acts automatically, because the proposed method includes the phase that estimates the noise properties
  6. Keywords:
  7. MR image filtering ; Sparse representation ; Adaptive ; Local error ; Low sensitivity ; MR images ; Noise properties ; Noise removal ; Reconstruction error ; Rician noise ; Simulated images ; Standard deviation ; Variable distribution ; Gaussian noise (electronic) ; Image processing ; Magnetic resonance ; Magnetic resonance imaging ; Statistics ; Image denoising ; Artifact ; Controlled study ; Diagnostic error ; Image reconstruction ; Kernel method ; Noise reduction ; Nuclear magnetic resonance imaging ; Sensitivity and specificity ; Simulation
  8. Source: Biomedical Engineering - Applications, Basis and Communications ; Volume 24, Issue 5 , October , 2012 , Pages 383-394 ; 10162372 (ISSN)
  9. URL: http://www.worldscientific.com/doi/abs/10.4015/S1016237212500342