Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/1764
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dc.contributor.authorMyers, Jerry G.en
dc.contributor.authorElmahdi, Abdelaziz M.en
dc.contributor.authorAnayiotos, Andreas-
dc.contributor.otherΑναγιωτός, Ανδρέας-
dc.date.accessioned2013-03-04T10:29:09Zen
dc.date.accessioned2013-05-17T05:22:12Z-
dc.date.accessioned2015-12-02T09:55:04Z-
dc.date.available2013-03-04T10:29:09Zen
dc.date.available2013-05-17T05:22:12Z-
dc.date.available2015-12-02T09:55:04Z-
dc.date.issued1999en
dc.identifier.citationUltrasound in Medicine and Biology, 1999, Volume 25, Issue 5, Pages 771-792en
dc.identifier.issn03015629en
dc.identifier.urihttps://hdl.handle.net/20.500.14279/1764-
dc.description.abstractMany noninvasive methodologies used for the accurate evaluation of valvular regurgitation require precise velocity measurements from ultrasound instruments. Previous studies have indicated that velocity measurements from color Doppler (CD) instruments are susceptible to errors due to the interaction of the ultrasound beam and the proximal orifice flow field. This study examined the influence of high aspect ratio (AR) orifices on the CD velocity error. Center line velocity error distributions for orifices ranging from 7.07 to 78.5 mm2, varying in shape from circular to an AR = 8 ellipse, were evaluated using a numerical model of the ultrasound beam and the simulated regurgitant flow field. An in vitro study was also performed and confirmed the findings of the numerical model. The study showed that increasing AR does not significantly change the error characteristics. The study confirmed that orifice size is the dominant factor in the error distribution, and that corrections speculated for circular orifices can be extended to elliptical orifices without significant errors. Many noninvasive methodologies used for the accurate evaluation of valvular regurgitation require precise velocity measurements from ultrasound instruments. Previous studies have indicated that velocity measurements from color Doppler (CD) instruments are susceptible to errors due to the interaction of the ultrasound beam and the proximal orifice flow field. This study examined the influence of high aspect ratio (AR) orifices on the CD velocity error. Center line velocity error distributions for orifices ranging from 7.07 to 78.5 mm2, varying in shape from circular to an AR = 8 ellipse, were evaluated using a numerical model of the ultrasound beam and the simulated regurgitant flow field. An in vitro study was also performed and confirmed the findings of the numerical model. The study showed that increasing AR does not significantly change the error characteristics. The study confirmed that orifice size is the dominant factor in the error distribution, and that corrections speculated for circular orifices can be extended to elliptical orifices without significant errors.en
dc.formatpdfen
dc.language.isoenen
dc.rights© 1999 World Federation for Ultrasound in Medicine & Biologyen
dc.subjectComputational fluid dynamicsen
dc.subjectComputational fluid dynamicsen
dc.subjectComputer simulationen
dc.titleColor Doppler velocity accuracy proximal to regurgitant orifices: influence of orifice aspect ratioen
dc.typeArticleen
dc.affiliationUniversity of Alabama at Birminghamen
dc.identifier.doihttp://dx.doi.org/10.1016/S0301-5629(99)00023-Xen
dc.dept.handle123456789/54en
item.grantfulltextnone-
item.openairecristypehttp://purl.org/coar/resource_type/c_6501-
item.fulltextNo Fulltext-
item.languageiso639-1en-
item.cerifentitytypePublications-
item.openairetypearticle-
crisitem.author.deptDepartment of Mechanical Engineering and Materials Science and Engineering-
crisitem.author.facultyFaculty of Engineering and Technology-
crisitem.author.orcid0000-0003-4471-7604-
crisitem.author.parentorgFaculty of Engineering and Technology-
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