PMID: 15217229Jun 26, 2004Paper

Noise reduction using spatial-angular compounding for elastography

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Udomchai TechavipooErnest L Madsen

Abstract

Ultrasound elastography has developed into an imaging modality suitable for detection and diagnosis of cancers in the breast, prostate, and thyroid and for monitoring ablative therapies in the liver, kidneys, and other sites. In this article, a new approach is described that enables the reduction of noise artifacts in elastography without a significant reduction in either the contrast or spatial resolution. The technique uses angular-weighted compounding of local angular strains estimated from echo signals scanned at different insonification angles. Strain estimated along angular insonification directions can be separated into strain tensor components along the axial (direction of compression) and lateral directions. The mechanical stimulus is applied only along one direction. Angular-weighting factors are derived from the relationship between the axial and lateral strains under the assumption of tissue incompressibility. Experimental results using a uniformly elastic, tissue-mimicking phantom demonstrate the improvement in the signal-to-noise ratio obtained with angular-weighted compounding. Variation in the signal-to-noise ratio obtained using different angular increments also is investigated. Elastograms obtained from an inc...Continue Reading

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Citations

Oct 16, 2012·Ultrasound in Medicine & Biology·Tim IdzengaChris L de Korte
Aug 28, 2010·Ultrasound Clinics·Tomy Varghese
Feb 10, 2009·Ultrasonics·Hao Chen, Tomy Varghese
Feb 19, 2016·IEEE Transactions on Medical Imaging·Hyun Jae KangEmad M Boctor

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