| The sensitivity of new color systems in blood-flow diagnosis. The maximum entropy method and angio-color-comparative in vitro flow measurements to determine sensitivity. | |
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MedLine Citation:
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PMID: 9381347 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Two new blood-flow-diagnosis techniques have recently been developed as supplements to the established color techniques: the MEM (maximum entropy method) technique and color flow amplitude (power Doppler). These are capable of representing blood flow in distinctly more slowly flowing areas than is possible with the conventional Doppler technique. METHODS: Both methods make use of the Doppler technique in part, yet analyze the reflected signal in a different manner, in so doing optimizing the relation between the noise and the signal. Measurements were obtained on two anatomic flow models to test the sensitivity of both techniques under slow flow conditions. RESULTS: The slowest flow the MEM technique was capable of recording was 0.5 mm/s, albeit utilizing a 5-MHz transducer for the MEM technique and a 10-MHz transducer for the angio technique. One may thus assume that the MEM technique would be still more sensitive when utilizing a 10-MHz transducer. The advantage of the MEM technique is its real-time flow representation: The angio technique requires a few seconds of acquisition time. This could have serious consequences during clinical utilization. Doppler sonography was merely capable of detecting a minimum flow velocity of 15 mm/s. The angio technique is less dependent on the angle during flow representation than the MEM technique. CONCLUSIONS: The distinctly higher sensitivity of these two new color techniques offers new possibilities in the clinical sector as far as the perfusion diagnosis of organs and tumors is concerned. |
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Authors:
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C Sohn; H P Weskott |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Surgical endoscopy Volume: 11 ISSN: 0930-2794 ISO Abbreviation: Surg Endosc Publication Date: 1997 Oct |
Date Detail:
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Created Date: 1997-11-10 Completed Date: 1997-11-10 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8806653 Medline TA: Surg Endosc Country: GERMANY |
Other Details:
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Languages: eng Pagination: 1040-4 Citation Subset: IM |
Affiliation:
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Department for Prenatal and Gynecological Ultrasound Diagnosis and Therapy, University of Heidelberg, Germany. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Angiography
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methods* Blood Flow Velocity Blood Vessels / physiology*, ultrasonography Entropy Humans Image Processing, Computer-Assisted* Models, Anatomic Sensitivity and Specificity Ultrasonography, Doppler, Color / methods* |
| Comments/Corrections | |
Erratum In:
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Surg Endosc 1997 Nov;11(11):1141 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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