NDLI: Multi-resolution approach to strain imaging

Content Provider	IEEE Xplore Digital Library
Author	Dey, J. Mai, J.J. Insana, M.F.
Copyright Year	2000
Description	Author affiliation: Biomed. Eng., California Univ., Davis, CA, USA (Dey, J.)
Abstract	An essential goal of a strain imaging experiment is to balance the desire to apply large deformations, and thereby maximize contrast, with the need to maintain waveform coherence between echoes recorded before and after deformation, and thereby minimize decorrelation noise. The tools available to achieve an optimal balance include control of boundary conditions and application of reconstruction algorithms that use all the available waveform information. This paper describes our work with a multi-resolution strain algorithm employing the maximum-likelihood strategy of filtering and waveform warping at several spatial scales. We found that echo waveform filtering improves the strain CNR when the echo SNR>30 dB and the applied strain >5%. We found that envelope-detected echoes provide more robust estimates than low-pass filtered RF echoes under most practical conditions. The benefits of echo-signal filtering for minimizing decorrelation noise are modest.
Starting Page	1853
Ending Page	1856
File Size	467484
Page Count	4
File Format	PDF
ISBN	0780363655
ISSN	10510117
DOI	10.1109/ULTSYM.2000.921685
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	Capacitive sensors Low pass filters Decorrelation Coherence Optimal control Boundary conditions Reconstruction algorithms Filtering algorithms Maximum likelihood estimation Noise robustness
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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