Subramaniam, Suba R. and Hon, Tsz K. and Ling, Wing-Kuen and Georgakis, Apostolos (2011) Optimal two-stage filtering of elastograms. In: The 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, August 30th - September 3rd 2011, Boston Marriott Copley Place, Boston, Mass..

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Abstract

In ultrasound elastography, tissue axial strains are obtained through the differentiation of measured axial displacements. However, during the measurement process, the displacement signals are often contaminated with de-correlation noise caused by changes in the speckle pattern in the tissue. Thus, the application of the gradient operator on the displacement signals results in the presence of amplified noise in the axial strains, which severely obscures the useful information. The use of an effective denoising scheme is therefore imperative. In this paper, a method based on a two-stage consecutive filtering approach is proposed for the accurate estimation of axial strains. The presented method considers a cascaded system of a frequency filter and a time window, which are both designed such that the overall system operates optimally as a minimum variance estimator. Experimentation on simulated signals shows that the two-stage scheme employed in this study has good potential as a denoising method for ultrasound elastograms.

Item Type:	Conference or Workshop Item (Lecture)
Additional Information:	In ultrasound elastography, tissue axial strains are obtained through the differentiation of measured axial displacements. However, during the measurement process, the displacement signals are often contaminated with de-correlation noise caused by changes in the speckle pattern in the tissue. Thus, the application of the gradient operator on the displacement signals results in the presence of amplified noise in the axial strains, which severely obscures the useful information. The use of an effective denoising scheme is therefore imperative. In this paper, a method based on a two-stage consecutive filtering approach is proposed for the accurate estimation of axial strains. The presented method considers a cascaded system of a frequency filter and a time window, which are both designed such that the overall system operates optimally as a minimum variance estimator. Experimentation on simulated signals shows that the two-stage scheme employed in this study has good potential as a denoising method for ultrasound elastograms.
Keywords:	optimization, two stage filtering, elastograms
Subjects:	H Engineering > H673 Bioengineering
Divisions:	College of Sciences > Faculty of Science > Lincoln School of Engineering
Depositing User:	Wing-Kuen Ling
Date Deposited:	09 Jun 2011 09:35
Last Modified:	13 Mar 2013 09:00
URI:	http://eprints.lincoln.ac.uk/id/eprint/4534

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