| Impact of harmonic imaging and transducer frequency on 'ventricular volume' measurements using real-time three-dimensional echocardiography: studies in an in vitro model. | |
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MedLine Citation:
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PMID: 11888818 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIMS: Harmonic imaging has increased the yield of quantifiable scans in two-dimensional echocardiography. Although real-time three-dimensional echocardiography avoids geometric assumptions in volume analysis, accurate measurement can be limited by image quality. This study compared volumes from a balloon model mimicking the left ventricle, scanned with and without harmonic imaging, using real time three-dimensional echocardiography. METHODS: Two balloons separated by ultrasound gel were suspended in a water bath. To mimic different chamber volumes, 12 volumes of water within the inner balloon (40-180ml) were scanned using a 3.5MHz probe at fundamental frequency and using a 2.5MHz probe with and without harmonic imaging. RESULTS: Scanning at 3.5MHz, the long axis (B) scans did not significantly underestimate the balloon volume but the 'short axis' (C) scans did (mean difference from actual volumes -0.7-1.4ml, P=0.14 - 3.9 +/- 1.2 ml,P < 0.0001 for B and C scans, respectively). Scanning at 2.5MHz both B and C scans significantly underestimated even more the true volume, C scans to a greater extent (mean difference -6.9 +/- 2.4ml and -11.2 +/- 4.0ml for B and C scans respectively,P < 0.0001 in both cases). However with harmonic imaging, transmitting at 1.7MHz and receiving at 2-4MHz, there was no significant difference of either B or C scans from the reference values (mean difference of B scans -1.2 +/- 1.9ml, P=0.06 and C scans -0.6 +/- 2.2ml, P=0.4). CONCLUSION: The enhanced resolution provided by harmonic imaging improves accuracy of volume analysis by real-time three-dimensional echocardiography. |
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Authors:
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R A Rusk; Y Mori; P S Mehwald; A Kenny; D J Sahn |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: European journal of echocardiography : the journal of the Working Group on Echocardiography of the European Society of Cardiology Volume: 2 ISSN: 1525-2167 ISO Abbreviation: Eur J Echocardiogr Publication Date: 2001 Dec |
Date Detail:
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Created Date: 2002-03-12 Completed Date: 2002-04-29 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 100890618 Medline TA: Eur J Echocardiogr Country: England |
Other Details:
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Languages: eng Pagination: 245-52 Citation Subset: IM |
Affiliation:
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Oregon Health Sciences University, Portland, Oregon, U.S.A. |
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| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Cardiac Volume / physiology* Echocardiography, Three-Dimensional / methods* Heart Ventricles / ultrasonography Linear Models Models, Cardiovascular Ventricular Function, Left / physiology* |
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