Document Detail

Empirical mode decomposition and tissue harmonic imaging.
MedLine Citation:
PMID:  16085096     Owner:  NLM     Status:  MEDLINE    
Empirical mode decomposition (EMD) is a relatively new technique used in the analysis of nonlinear and nonstationary time series. Previous signal-processing methods used for medical ultrasound have been based on the assumption of a linear time-invariant system. More recently, the technique of tissue harmonic imaging (THI) has become prevalent. This technique relies on the nonlinear propagation of the sound wave through the medium to disperse the signal energy into the harmonic frequencies of the transmitted signal. In this paper, results are presented from using EMD to process received ultrasound echo signals that have passed through nonlinear media. The Hilbert spectrum is used to demonstrate an interpretation of the physical process underlying THI that is based on the concept of intrawave frequency modulation, rather then the spreading of signal energy into harmonic frequencies. The technique of EMD is shown to be able to produce superior results to the bandpass filtering method of THI, even when the band width of the transducer was such that the second harmonic would be suppressed.
Michael Bennett; Steve McLaughlin; Tom Anderson; Norman McDicken
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ultrasound in medicine & biology     Volume:  31     ISSN:  0301-5629     ISO Abbreviation:  Ultrasound Med Biol     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-08-08     Completed Date:  2006-03-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410553     Medline TA:  Ultrasound Med Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1051-61     Citation Subset:  IM    
School of Engineering and Electronics, University of Edinburgh, Edinburgh, UK.
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MeSH Terms
Equipment Design
Image Enhancement / methods
Models, Biological
Phantoms, Imaging
Reproducibility of Results
Signal Processing, Computer-Assisted
Ultrasonography / methods*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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