| Do Doppler color flow algorithms for mapping disturbed flow make sense? | |
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MedLine Citation:
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PMID: 2206548 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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It has been suggested that a major advantage of Doppler color flow mapping is its ability to visualize areas of disturbed ("turbulent") flow, for example, in valvular stenosis or regurgitation and in shunts. To investigate how various color flow mapping instruments display disturbed flow information, color image processing was used to evaluate the most common velocity-variance color encoding algorithms of seven commercially available ultrasound machines. In six of seven machines, green was reportedly added by the variance display algorithms to map areas of disturbed flow. The amount of green intensity added to each pixel along the red and blue portions of the velocity reference color bar was calculated for each machine. In this study, velocities displayed on the reference color bar ranged from +/- 46 to +/- 64 cm/sec, depending on the Nyquist limit. Of note, changing the Nyquist limits depicted on the color reference bars did not change the distribution of the intensities of red, blue, or green within the contour of the reference map, but merely assigned different velocities to the pixels. Most color flow mapping algorithms in our study added increasing intensities of green to increasing positive (red) or negative (blue) velocities along their color reference bars. Most of these machines also added increasing green to red and blue color intensities horizontally across their reference bars as a marker of increased variance (spectral broadening). However, at any given velocity, marked variations were noted between different color flow mapping instruments in the amount of green added to their color velocity reference bars.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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J M Gardin; S M Lobodzinski |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography Volume: 3 ISSN: 0894-7317 ISO Abbreviation: J Am Soc Echocardiogr Publication Date: 1990 Jul-Aug |
Date Detail:
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Created Date: 1990-11-13 Completed Date: 1990-11-13 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8801388 Medline TA: J Am Soc Echocardiogr Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 310-5 Citation Subset: IM |
Affiliation:
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Department of Medicine, University of California, Irvine. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms* Blood Flow Velocity Computer Graphics* Echocardiography, Doppler* / instrumentation Humans Image Processing, Computer-Assisted* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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