| Digital compression of echocardiograms: impact on quantitative interpretation of color Doppler velocity. | |
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MedLine Citation:
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PMID: 8887862 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To test the impact of Joint Photographic Expert Group (JPEG) compression on the quantitative data encoded in color Doppler echocardiographic images, digital images from transesophageal echocardiography and an in vitro model of proximal flow convergence were analyzed before and after JPEG compression with compression ratios (CRs) as high as 65:1. Even at the highest CRs, greater than 95% of the pixels were categorized correctly as representing structure (gray scale) and greater than 98% were categorized correctly as representing velocity (color) data. Furthermore, the velocities and flows recovered from the compressed images agreed well (r = 0.998 [velocities] and r = 0.998 [flows] for CR = 7:1, falling to r = 0.881 [velocities] and r = 0.930 [flows] at CR = 65:1; p < 0.001 for the linear trend with CR). There was similarly little shift in the location of the red-blue aliasing contour, rising from an error of 0.05 +/- 0.19 (mean +/- SD) mm at CR = 7:1 to a maximum error of 0.11 +/- 0.36 mm at CR = 44:1. Thus JPEG compression has little impact on the quantitative velocity data encoded within color Doppler echocardiograms, which should allow widespread acceptance of digital transmission and storage. |
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Authors:
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J D Thomas; S Chandra; T H Karson; M Pu; P M Vandervoort |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography Volume: 9 ISSN: 0894-7317 ISO Abbreviation: J Am Soc Echocardiogr Publication Date: 1996 Sep-Oct |
Date Detail:
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Created Date: 1997-02-12 Completed Date: 1997-02-12 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: 606-15 Citation Subset: IM |
Affiliation:
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Department of Cardiology, Cleveland Clinic Foundation, OH 44195, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Echocardiography, Doppler, Color* Echocardiography, Transesophageal Humans Image Enhancement / methods |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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