title: Reduced Imaging Rate in Liver Elastometery Using Shear Wave Interference Patterns.
abstract: Inducing interference patterns of shear wave is one of the proposed methods for reducing the frame rate in measuring wave speed during tissue elastography. Previously, the Nyquist rate must be met in order to provide an appropriate image for extracting the patterns with a reasonable accuracy. In this article we propose a technique based on image registration, and apply it to ultrasound images acquired before and after inducing the shear waves to estimate the amplitude of displacement. The displacement of the tissue is then used to form the interference pattern of shear waves. The method does not induce any restrictions on the time interval between images, so the tissue elasticity can be calculated independent of the imaging rate. The average error in measuring the elasticity of the simulated phantom is 13.7%.
authors.affiliation: Department of Medical Physics and Biomedical Engineering, Tehran University of medical sciences, Tehran, Iran.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Soozande
authors.affiliation: Department of Medical Physics and Biomedical Engineering, Tehran University of medical sciences, Tehran, Iran.
authors.forename: Hossein
authors.initials: H
authors.lastname: Arabalibeik
authors.affiliation: Center for Gastroenterology and Liver Disease, Baqiyatallah University of Medical Sciences, Tehran, Iran.
authors.forename: Seyed Moayed
authors.initials: SM
authors.lastname: Alavian
mesh_terms: D000818:Animals; D055119:Elastic Modulus / Q000502:physiology; D054459:Elasticity Imaging Techniques / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods*; D008099:Liver / Q000000981:diagnostic imaging* / Q000502:physiology*; D015203:Reproducibility of Results; D018401:Sample Size; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted