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    A Three-Dimensional Computational Simulation of Some Sources of Measurement Artifact in Microvascular Pulsed Ultrasound Doppler Velocimetry

    Source: Journal of Biomechanical Engineering:;1985:;volume( 107 ):;issue: 003::page 274
    Author:
    T. D. Brown
    ,
    L. D. Bell
    ,
    D. R. Pedersen
    ,
    W. F. Blair
    DOI: 10.1115/1.3138553
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Recent applications of 20 MHz pulsed ultrasound Doppler velocimetry (PUDVM) in microsurgical research have necessarily employed piezoelectric crystals whose diameter is not negligible compared to the lumen size (1–2 mm) of many vessels of interest. A three-dimensional numerical model was developed to explore relationships between actual and detected flow field parameters, for (steady) Poiseuille flow, when appreciable velocity gradients exist within the PUDVM sample volume. Validation studies showed that highly accurate velocity profiles could be obtained in the limiting case of a very small sample volume (0.1 mm radius), but that for currently employed crystals ( ≈ 0.5 mm radius) there was appreciable underestimation of the centersteam velocity, and appreciable overestimation of the flow stream diameter. Errors in perceived velocity and flow rate were found to be relatively insensitive to perturbations in the sample volume thickness, in the size of the sampling range increment, or in the angle of insonation beam divergence. By contrast, these apparent flow parameters were found to be very sensitive to perturbations of sample volume diameter or of the Dopper angle. Small variations in the degree of partial sample volume overlap of the flowstream periphery were shown to be capable of causing large fluctuations in apparent flow stream diameter.
    keyword(s): Simulation , Ultrasound , Flow (Dynamics) , Crystals , Computer simulation , Fluctuations (Physics) , Sampling (Acoustical engineering) , Errors , Gradients , Poiseuille flow , Thickness AND Vessels ,
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      A Three-Dimensional Computational Simulation of Some Sources of Measurement Artifact in Microvascular Pulsed Ultrasound Doppler Velocimetry

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/99522
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    • Journal of Biomechanical Engineering

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    contributor authorT. D. Brown
    contributor authorL. D. Bell
    contributor authorD. R. Pedersen
    contributor authorW. F. Blair
    date accessioned2017-05-08T23:19:42Z
    date available2017-05-08T23:19:42Z
    date copyrightAugust, 1985
    date issued1985
    identifier issn0148-0731
    identifier otherJBENDY-25805#274_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/99522
    description abstractRecent applications of 20 MHz pulsed ultrasound Doppler velocimetry (PUDVM) in microsurgical research have necessarily employed piezoelectric crystals whose diameter is not negligible compared to the lumen size (1–2 mm) of many vessels of interest. A three-dimensional numerical model was developed to explore relationships between actual and detected flow field parameters, for (steady) Poiseuille flow, when appreciable velocity gradients exist within the PUDVM sample volume. Validation studies showed that highly accurate velocity profiles could be obtained in the limiting case of a very small sample volume (0.1 mm radius), but that for currently employed crystals ( ≈ 0.5 mm radius) there was appreciable underestimation of the centersteam velocity, and appreciable overestimation of the flow stream diameter. Errors in perceived velocity and flow rate were found to be relatively insensitive to perturbations in the sample volume thickness, in the size of the sampling range increment, or in the angle of insonation beam divergence. By contrast, these apparent flow parameters were found to be very sensitive to perturbations of sample volume diameter or of the Dopper angle. Small variations in the degree of partial sample volume overlap of the flowstream periphery were shown to be capable of causing large fluctuations in apparent flow stream diameter.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Three-Dimensional Computational Simulation of Some Sources of Measurement Artifact in Microvascular Pulsed Ultrasound Doppler Velocimetry
    typeJournal Paper
    journal volume107
    journal issue3
    journal titleJournal of Biomechanical Engineering
    identifier doi10.1115/1.3138553
    journal fristpage274
    journal lastpage280
    identifier eissn1528-8951
    keywordsSimulation
    keywordsUltrasound
    keywordsFlow (Dynamics)
    keywordsCrystals
    keywordsComputer simulation
    keywordsFluctuations (Physics)
    keywordsSampling (Acoustical engineering)
    keywordsErrors
    keywordsGradients
    keywordsPoiseuille flow
    keywordsThickness AND Vessels
    treeJournal of Biomechanical Engineering:;1985:;volume( 107 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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