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An Efficient Motion Estimation and Compensation Method for Ultrasound Synthetic Aperture Imaging  

김강식 (서강대학교 전자공학과)
황재섭 (서강대학교 전자공학과)
정종섭 (서강대학교 전자공학과)
송태경 (서강대학교 전자공학과)
Publication Information
Journal of Biomedical Engineering Research / v.23, no.2, 2002 , pp. 87-99 More about this Journal
Abstract
This paper describes a method for overcoming the motion artifacts inherent in synthetic aperture(SA) imaging. based on the investigation results as to the influence of a target motion on synthetic aperture techniques. This method uses a region-based motion compensation approach in which only the axial motion is estimated and compensated for a given region of interest(ROI) under the assumption that the whole ROI moves uniformly The estimated axial motion is calculated with a crosscorrelation(CC) method at the Point where the focused signal has the maximum energy within the ROI. We also presents a method for estimating the axial motion using the autocorrelation(AC) method that is widely used to estimate average Doppler frequency Both computer simulations and in vivo experiments show that the proposed methods can improve greatly the spatial resolution and SNR of ultrasound imaging by implementing the SA techniques for two-way dynamic focusing without motion artifacts. In addition the AC-barred motion compensation method provides almost the same results as the CC-based one, but with a dramatically reduced computational complexity.
Keywords
Medical ultrasound imaging; Synthetic aperture; Motion estimation; Phase distortion; Motion compensation; Spatial resolution;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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