NDLI: Spatial covariance analysis for tissue harmonic imaging

Content Provider	IEEE Xplore Digital Library
Author	Che-Chou Shen Pal-Chi Li
Copyright Year	2000
Description	Author affiliation: Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan (Che-Chou Shen)
Abstract	Spatial covariance contains important information in the context of correlation-based correction of sound velocity inhomogeneities. Previous work was primarily based on spatial covariance analysis for linear imaging. In this paper, we extend the analysis to tissue harmonic imaging. Specifically, we investigate effects of the signal-to-noise ratio (SNR) and sound velocity inhomogeneities on spatial covariance. It is shown that linear imaging at f/sub 0/ and second harmonic imaging at 2f/sub 0/ have similar spatial covariance at high SNRs, regardless the presence of sound velocity inhomogeneities. At low SNRs, however, spatial covariance of tissue harmonic imaging is significantly affected. It is concluded that the linear signal is more suitable for correlation-based correction of sound velocity inhomogeneities despite the fact that tissue harmonic imaging generally has improved image quality over linear imaging.
Starting Page	1739
Ending Page	1742
File Size	332476
Page Count	4
File Format	PDF
ISBN	0780363655
ISSN	10510117
DOI	10.1109/ULTSYM.2000.921658
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-10-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Harmonic analysis Image analysis Ultrasonic transducers Acoustic imaging Ultrasonic imaging Delay effects Ultrasonic variables measurement Signal to noise ratio Image quality Degradation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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