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Denoising worm artifacts of elastogram using 2-D wavelet shrinkage / 生物医学工程学杂志
Journal of Biomedical Engineering ; (6): 460-464, 2011.
Artigo em Chinês | WPRIM | ID: wpr-306538
ABSTRACT
This paper proposes a technique to denoise the worm artifacts of elastogram using 2-D wavelet shrinkage denoising method. Firstly, strain estimate matrix including worm artifacts was decomposed to 3 levels by 2-D discrete wavelet transform with Sym8 wavelet function, and the thresholds were obtained using Birg6-Massart algorithm. Secondly, all the high frequency coefficients on different levels were quantized by using hard threshold and soft threshold function. Finally, the strain estimate matrix was reconstructed by using the 3rd layer low frequency coefficients and other layer quantized high frequency coefficients. The simulation results illustrated that the present technique could efficiently denoise the worm artifacts, enhance the elastogram performance indices, such as elastographic signal-to-noise ratio (SNRe) and elastographic contrast-to-noise ratio (CNRe), and could increase the correlation coefficient between the denoised elastogram and the ideal elastogram. In comparison with 2-D low-pass filtering, it could also obtain the higher elastographic SNRe and CNRe, and have clearer hard lesion edge. In addition, the results demonstrated that the proposed technique could suppress worm artifacts of elastograms for various applied strains. This work showed that the 2-D wavelet shrinkage denoising could efficiently denoise the worm artifacts of elastogram and enhance the performance of elastogram.
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Algoritmos / Processamento de Imagem Assistida por Computador / Artefatos / Técnicas de Imagem por Elasticidade / Análise de Ondaletas / Métodos Tipo de estudo: Estudo diagnóstico Limite: Humanos Idioma: Chinês Revista: Journal of Biomedical Engineering Ano de publicação: 2011 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Algoritmos / Processamento de Imagem Assistida por Computador / Artefatos / Técnicas de Imagem por Elasticidade / Análise de Ondaletas / Métodos Tipo de estudo: Estudo diagnóstico Limite: Humanos Idioma: Chinês Revista: Journal of Biomedical Engineering Ano de publicação: 2011 Tipo de documento: Artigo