Estimation of left ventricular myocardial elasticity and viscosity by a thick-walled spherical model
Identifieur interne : 002695 ( Istex/Corpus ); précédent : 002694; suivant : 002696Estimation of left ventricular myocardial elasticity and viscosity by a thick-walled spherical model
Auteurs : J. Tani ; H. Yamamoto ; H. Honda ; K. Ootomo ; Y. Koiwa ; T. Takagi ; J. Kikuchi ; N. Hoshi ; T. TakishimaSource :
- Medical and Biological Engineering and Computing [ 0140-0118 ] ; 1993-07-01.
Abstract
Abstract: The authors measured the transfer function (TF) of the left ventricle (LV) in an isolated canine preparation. Here TF indicates the ratio of induced vibration in LV to input vibration when an external mechanical oscillation is applied. TF had a single peak the frequency of which changed from 40 Hz to 80 Hz when LV pressure (LVP) increased from 6 mm Hg to 96 mm Hg. A mathematical model was formulated to estimate the viscoelasticity of the spherical shell. This model was constructed of the material points, elastic components which connected all the material points, and viscous components placed in series with elastic components. Theoretical TF can be computed if the viscoelastic values are given. The value of viscoelasticity at which the theoretical TF best fitted the experimental TF was considered to be the viscoelasticity of the model. The validity of this approach was verified using a silicone spherical shell. The estimated myocardial elasticity was 40 kPa when LVP was 6 mm Hg, 160–170 kPa when LVP was 96 mm Hg and was approximately proportional to LVP, whereas viscosity showed small change. The inclination of elasticity was consistent with previous reports. These results proved that myocardial elasticity can be estimated by analysing the transfer function of the left ventricle.
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DOI: 10.1007/BF02446683
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Estimation of left ventricular myocardial elasticity and viscosity by a thick-walled spherical model</title><author><name sortKey="Tani, J" sort="Tani, J" uniqKey="Tani J" first="J." last="Tani">J. Tani</name><affiliation><mods:affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Yamamoto, H" sort="Yamamoto, H" uniqKey="Yamamoto H" first="H." last="Yamamoto">H. Yamamoto</name><affiliation><mods:affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Honda, H" sort="Honda, H" uniqKey="Honda H" first="H." last="Honda">H. 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Tani</name><affiliation><mods:affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Yamamoto, H" sort="Yamamoto, H" uniqKey="Yamamoto H" first="H." last="Yamamoto">H. Yamamoto</name><affiliation><mods:affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Honda, H" sort="Honda, H" uniqKey="Honda H" first="H." last="Honda">H. Honda</name><affiliation><mods:affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Ootomo, K" sort="Ootomo, K" uniqKey="Ootomo K" first="K." last="Ootomo">K. Ootomo</name><affiliation><mods:affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Koiwa, Y" sort="Koiwa, Y" uniqKey="Koiwa Y" first="Y." last="Koiwa">Y. Koiwa</name><affiliation><mods:affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Takagi, T" sort="Takagi, T" uniqKey="Takagi T" first="T." last="Takagi">T. Takagi</name><affiliation><mods:affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Kikuchi, J" sort="Kikuchi, J" uniqKey="Kikuchi J" first="J." last="Kikuchi">J. Kikuchi</name><affiliation><mods:affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Hoshi, N" sort="Hoshi, N" uniqKey="Hoshi N" first="N." last="Hoshi">N. Hoshi</name><affiliation><mods:affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author><author><name sortKey="Takishima, T" sort="Takishima, T" uniqKey="Takishima T" first="T." last="Takishima">T. Takishima</name><affiliation><mods:affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Medical and Biological Engineering and Computing</title><title level="j" type="abbrev">Med. Biol. Eng. Comput.</title><idno type="ISSN">0140-0118</idno><idno type="eISSN">1741-0444</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1993-07-01">1993-07-01</date><biblScope unit="volume">31</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="325">325</biblScope><biblScope unit="page" to="332">332</biblScope></imprint><idno type="ISSN">0140-0118</idno></series><idno type="istex">08C6E5E6A68ECA0F4FE560E514B45D9CEC9897C2</idno><idno type="DOI">10.1007/BF02446683</idno><idno type="ArticleID">BF02446683</idno><idno type="ArticleID">Art1</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0140-0118</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: The authors measured the transfer function (TF) of the left ventricle (LV) in an isolated canine preparation. Here TF indicates the ratio of induced vibration in LV to input vibration when an external mechanical oscillation is applied. TF had a single peak the frequency of which changed from 40 Hz to 80 Hz when LV pressure (LVP) increased from 6 mm Hg to 96 mm Hg. A mathematical model was formulated to estimate the viscoelasticity of the spherical shell. This model was constructed of the material points, elastic components which connected all the material points, and viscous components placed in series with elastic components. Theoretical TF can be computed if the viscoelastic values are given. The value of viscoelasticity at which the theoretical TF best fitted the experimental TF was considered to be the viscoelasticity of the model. The validity of this approach was verified using a silicone spherical shell. The estimated myocardial elasticity was 40 kPa when LVP was 6 mm Hg, 160–170 kPa when LVP was 96 mm Hg and was approximately proportional to LVP, whereas viscosity showed small change. The inclination of elasticity was consistent with previous reports. These results proved that myocardial elasticity can be estimated by analysing the transfer function of the left ventricle.</div></front></TEI><istex><corpusName>springer</corpusName><author><json:item><name>J. Tani</name><affiliations><json:string>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</json:string></affiliations></json:item><json:item><name>H. Yamamoto</name><affiliations><json:string>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</json:string></affiliations></json:item><json:item><name>H. Honda</name><affiliations><json:string>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</json:string></affiliations></json:item><json:item><name>K. Ootomo</name><affiliations><json:string>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</json:string></affiliations></json:item><json:item><name>Y. Koiwa</name><affiliations><json:string>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</json:string></affiliations></json:item><json:item><name>T. Takagi</name><affiliations><json:string>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</json:string></affiliations></json:item><json:item><name>J. Kikuchi</name><affiliations><json:string>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</json:string></affiliations></json:item><json:item><name>N. Hoshi</name><affiliations><json:string>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</json:string></affiliations></json:item><json:item><name>T. Takishima</name><affiliations><json:string>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</json:string></affiliations></json:item></author><articleId><json:string>BF02446683</json:string><json:string>Art1</json:string></articleId><language><json:string>eng</json:string></language><abstract>Abstract: The authors measured the transfer function (TF) of the left ventricle (LV) in an isolated canine preparation. Here TF indicates the ratio of induced vibration in LV to input vibration when an external mechanical oscillation is applied. TF had a single peak the frequency of which changed from 40 Hz to 80 Hz when LV pressure (LVP) increased from 6 mm Hg to 96 mm Hg. A mathematical model was formulated to estimate the viscoelasticity of the spherical shell. This model was constructed of the material points, elastic components which connected all the material points, and viscous components placed in series with elastic components. Theoretical TF can be computed if the viscoelastic values are given. The value of viscoelasticity at which the theoretical TF best fitted the experimental TF was considered to be the viscoelasticity of the model. The validity of this approach was verified using a silicone spherical shell. The estimated myocardial elasticity was 40 kPa when LVP was 6 mm Hg, 160–170 kPa when LVP was 96 mm Hg and was approximately proportional to LVP, whereas viscosity showed small change. The inclination of elasticity was consistent with previous reports. These results proved that myocardial elasticity can be estimated by analysing the transfer function of the left ventricle.</abstract><qualityIndicators><score>7.52</score><pdfVersion>1.3</pdfVersion><pdfPageSize>598 x 842 pts</pdfPageSize><refBibsNative>false</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>1310</abstractCharCount><pdfWordCount>5156</pdfWordCount><pdfCharCount>28454</pdfCharCount><pdfPageCount>8</pdfPageCount><abstractWordCount>210</abstractWordCount></qualityIndicators><title>Estimation of left ventricular myocardial elasticity and viscosity by a thick-walled spherical model</title><genre.original><json:string>OriginalPaper</json:string></genre.original><genre><json:string>research-article</json:string></genre><host><issue>4</issue><subject><json:item><value>Human Physiology</value></json:item><json:item><value>Neurosciences</value></json:item><json:item><value>Imaging / Radiology</value></json:item><json:item><value>Computer 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Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</affiliation></author><author><persName><forename type="first">H.</forename><surname>Yamamoto</surname></persName><affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</affiliation></author><author><persName><forename type="first">H.</forename><surname>Honda</surname></persName><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation></author><author><persName><forename type="first">K.</forename><surname>Ootomo</surname></persName><affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</affiliation></author><author><persName><forename type="first">Y.</forename><surname>Koiwa</surname></persName><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation></author><author><persName><forename type="first">T.</forename><surname>Takagi</surname></persName><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation></author><author><persName><forename type="first">J.</forename><surname>Kikuchi</surname></persName><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation></author><author><persName><forename type="first">N.</forename><surname>Hoshi</surname></persName><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation></author><author><persName><forename type="first">T.</forename><surname>Takishima</surname></persName><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation></author></analytic><monogr><title level="j">Medical and Biological Engineering and Computing</title><title level="j" type="abbrev">Med. Biol. Eng. Comput.</title><idno type="JournalID">11517</idno><idno type="pISSN">0140-0118</idno><idno type="eISSN">1741-0444</idno><idno type="IssueArticleCount">21</idno><idno type="VolumeIssueCount">6</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1993-07-01"></date><biblScope unit="volume">31</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="325">325</biblScope><biblScope unit="page" to="332">332</biblScope></imprint></monogr><idno type="istex">08C6E5E6A68ECA0F4FE560E514B45D9CEC9897C2</idno><idno type="DOI">10.1007/BF02446683</idno><idno type="ArticleID">BF02446683</idno><idno type="ArticleID">Art1</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1991-05-02</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Abstract: The authors measured the transfer function (TF) of the left ventricle (LV) in an isolated canine preparation. Here TF indicates the ratio of induced vibration in LV to input vibration when an external mechanical oscillation is applied. TF had a single peak the frequency of which changed from 40 Hz to 80 Hz when LV pressure (LVP) increased from 6 mm Hg to 96 mm Hg. A mathematical model was formulated to estimate the viscoelasticity of the spherical shell. This model was constructed of the material points, elastic components which connected all the material points, and viscous components placed in series with elastic components. Theoretical TF can be computed if the viscoelastic values are given. The value of viscoelasticity at which the theoretical TF best fitted the experimental TF was considered to be the viscoelasticity of the model. The validity of this approach was verified using a silicone spherical shell. The estimated myocardial elasticity was 40 kPa when LVP was 6 mm Hg, 160–170 kPa when LVP was 96 mm Hg and was approximately proportional to LVP, whereas viscosity showed small change. The inclination of elasticity was consistent with previous reports. These results proved that myocardial elasticity can be estimated by analysing the transfer function of the left ventricle.</p></abstract><textClass><keywords scheme="Journal Subject"><list><head>Engineering</head><item><term>Human Physiology</term></item><item><term>Neurosciences</term></item><item><term>Imaging / Radiology</term></item><item><term>Computer Applications</term></item><item><term>Biomedical Engineering</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1991-05-02">Created</change><change when="1993-07-01">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-3-20">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/08C6E5E6A68ECA0F4FE560E514B45D9CEC9897C2/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Springer, Publisher found" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0" encoding="UTF-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//Springer-Verlag//DTD A++ V2.4//EN" URI="http://devel.springer.de/A++/V2.4/DTD/A++V2.4.dtd" name="istex:docType"></istex:docType><istex:document><Publisher><PublisherInfo><PublisherName>Kluwer Academic Publishers</PublisherName><PublisherLocation>Dordrecht</PublisherLocation></PublisherInfo><Journal><JournalInfo JournalProductType="ArchiveJournal" NumberingStyle="Unnumbered"><JournalID>11517</JournalID><JournalPrintISSN>0140-0118</JournalPrintISSN><JournalElectronicISSN>1741-0444</JournalElectronicISSN><JournalTitle>Medical and Biological Engineering and Computing</JournalTitle><JournalAbbreviatedTitle>Med. Biol. Eng. Comput.</JournalAbbreviatedTitle><JournalSubjectGroup><JournalSubject Type="Primary">Engineering</JournalSubject><JournalSubject Type="Secondary">Human Physiology</JournalSubject><JournalSubject Type="Secondary">Neurosciences</JournalSubject><JournalSubject Type="Secondary">Imaging / Radiology</JournalSubject><JournalSubject Type="Secondary">Computer Applications</JournalSubject><JournalSubject Type="Secondary">Biomedical Engineering</JournalSubject></JournalSubjectGroup></JournalInfo><Volume><VolumeInfo TocLevels="0" VolumeType="Regular"><VolumeIDStart>31</VolumeIDStart><VolumeIDEnd>31</VolumeIDEnd><VolumeIssueCount>6</VolumeIssueCount></VolumeInfo><Issue IssueType="Regular"><IssueInfo TocLevels="0"><IssueIDStart>4</IssueIDStart><IssueIDEnd>4</IssueIDEnd><IssueArticleCount>21</IssueArticleCount><IssueHistory><CoverDate><Year>1993</Year><Month>7</Month></CoverDate></IssueHistory><IssueCopyright><CopyrightHolderName>IFMBE</CopyrightHolderName><CopyrightYear>1993</CopyrightYear></IssueCopyright></IssueInfo><Article ID="Art1"><ArticleInfo ArticleType="OriginalPaper" ContainsESM="No" Language="En" NumberingStyle="Unnumbered" TocLevels="0"><ArticleID>BF02446683</ArticleID><ArticleDOI>10.1007/BF02446683</ArticleDOI><ArticleSequenceNumber>1</ArticleSequenceNumber><ArticleTitle Language="En">Estimation of left ventricular myocardial elasticity and viscosity by a thick-walled spherical model</ArticleTitle><ArticleCategory>Biomedical Engineering</ArticleCategory><ArticleFirstPage>325</ArticleFirstPage><ArticleLastPage>332</ArticleLastPage><ArticleHistory><RegistrationDate><Year>2006</Year><Month>6</Month><Day>14</Day></RegistrationDate><Received><Year>1991</Year><Month>5</Month><Day>2</Day></Received><Accepted><Year>1992</Year><Month>3</Month><Day>9</Day></Accepted></ArticleHistory><ArticleCopyright><CopyrightHolderName>IFMBE</CopyrightHolderName><CopyrightYear>1993</CopyrightYear></ArticleCopyright><ArticleGrants Type="Regular"><MetadataGrant Grant="OpenAccess"></MetadataGrant><AbstractGrant Grant="OpenAccess"></AbstractGrant><BodyPDFGrant Grant="Restricted"></BodyPDFGrant><BodyHTMLGrant Grant="Restricted"></BodyHTMLGrant><BibliographyGrant Grant="Restricted"></BibliographyGrant><ESMGrant Grant="Restricted"></ESMGrant></ArticleGrants><ArticleContext><JournalID>11517</JournalID><VolumeIDStart>31</VolumeIDStart><VolumeIDEnd>31</VolumeIDEnd><IssueIDStart>4</IssueIDStart><IssueIDEnd>4</IssueIDEnd></ArticleContext></ArticleInfo><ArticleHeader><AuthorGroup><Author AffiliationIDS="Aff1"><AuthorName DisplayOrder="Western"><GivenName>J.</GivenName><FamilyName>Tani</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff1"><AuthorName DisplayOrder="Western"><GivenName>H.</GivenName><FamilyName>Yamamoto</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>H.</GivenName><FamilyName>Honda</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff1"><AuthorName DisplayOrder="Western"><GivenName>K.</GivenName><FamilyName>Ootomo</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>Y.</GivenName><FamilyName>Koiwa</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>T.</GivenName><FamilyName>Takagi</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>J.</GivenName><FamilyName>Kikuchi</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>N.</GivenName><FamilyName>Hoshi</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>T.</GivenName><FamilyName>Takishima</FamilyName></AuthorName></Author><Affiliation ID="Aff1"><OrgDivision>Institute of Fluid Science</OrgDivision><OrgName>Tohoku University</OrgName><OrgAddress><Street>Katahira 2-1-1, Aoba-ku</Street><Postcode>980</Postcode><City>Sendai</City><Country>Japan</Country></OrgAddress></Affiliation><Affiliation ID="Aff2"><OrgDivision>The First Department of Internal Medicine</OrgDivision><OrgName>Tohoku University School of Medicine</OrgName><OrgAddress><Street>1-1 Seryo-machi, Aoba-ku</Street><Postcode>980</Postcode><City>Sendai</City><Country>Japan</Country></OrgAddress></Affiliation></AuthorGroup><Abstract ID="Abs1" Language="En"><Heading>Abstract</Heading><Para>The authors measured the transfer function (TF) of the left ventricle (LV) in an isolated canine preparation. Here TF indicates the ratio of induced vibration in LV to input vibration when an external mechanical oscillation is applied. TF had a single peak the frequency of which changed from 40 Hz to 80 Hz when LV pressure (LVP) increased from 6 mm Hg to 96 mm Hg. A mathematical model was formulated to estimate the viscoelasticity of the spherical shell. This model was constructed of the material points, elastic components which connected all the material points, and viscous components placed in series with elastic components. Theoretical TF can be computed if the viscoelastic values are given. The value of viscoelasticity at which the theoretical TF best fitted the experimental TF was considered to be the viscoelasticity of the model. The validity of this approach was verified using a silicone spherical shell. The estimated myocardial elasticity was 40 kPa when LVP was 6 mm Hg, 160–170 kPa when LVP was 96 mm Hg and was approximately proportional to LVP, whereas viscosity showed small change. The inclination of elasticity was consistent with previous reports. These results proved that myocardial elasticity can be estimated by analysing the transfer function of the left ventricle.</Para></Abstract><KeywordGroup Language="En"><Heading>Keywords</Heading><Keyword>Curve fit</Keyword><Keyword>Finite-element method</Keyword><Keyword>Left ventricle</Keyword><Keyword>Thick-walled spherical shell</Keyword><Keyword>Transfer function</Keyword><Keyword>Viscoelastic properties</Keyword></KeywordGroup></ArticleHeader><NoBody></NoBody></Article></Issue></Volume></Journal></Publisher></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Estimation of left ventricular myocardial elasticity and viscosity by a thick-walled spherical model</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Estimation of left ventricular myocardial elasticity and viscosity by a thick-walled spherical model</title></titleInfo><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Tani</namePart><affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">H.</namePart><namePart type="family">Yamamoto</namePart><affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">H.</namePart><namePart type="family">Honda</namePart><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">K.</namePart><namePart type="family">Ootomo</namePart><affiliation>Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, 980, Sendai, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Y.</namePart><namePart type="family">Koiwa</namePart><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">T.</namePart><namePart type="family">Takagi</namePart><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Kikuchi</namePart><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">N.</namePart><namePart type="family">Hoshi</namePart><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">T.</namePart><namePart type="family">Takishima</namePart><affiliation>The First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seryo-machi, Aoba-ku, 980, Sendai, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="OriginalPaper"></genre><originInfo><publisher>Kluwer Academic Publishers</publisher><place><placeTerm type="text">Dordrecht</placeTerm></place><dateCreated encoding="w3cdtf">1991-05-02</dateCreated><dateIssued encoding="w3cdtf">1993-07-01</dateIssued><copyrightDate encoding="w3cdtf">1993</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Abstract: The authors measured the transfer function (TF) of the left ventricle (LV) in an isolated canine preparation. Here TF indicates the ratio of induced vibration in LV to input vibration when an external mechanical oscillation is applied. TF had a single peak the frequency of which changed from 40 Hz to 80 Hz when LV pressure (LVP) increased from 6 mm Hg to 96 mm Hg. A mathematical model was formulated to estimate the viscoelasticity of the spherical shell. This model was constructed of the material points, elastic components which connected all the material points, and viscous components placed in series with elastic components. Theoretical TF can be computed if the viscoelastic values are given. The value of viscoelasticity at which the theoretical TF best fitted the experimental TF was considered to be the viscoelasticity of the model. The validity of this approach was verified using a silicone spherical shell. The estimated myocardial elasticity was 40 kPa when LVP was 6 mm Hg, 160–170 kPa when LVP was 96 mm Hg and was approximately proportional to LVP, whereas viscosity showed small change. The inclination of elasticity was consistent with previous reports. These results proved that myocardial elasticity can be estimated by analysing the transfer function of the left ventricle.</abstract><note>Biomedical Engineering</note><relatedItem type="host"><titleInfo><title>Medical and Biological Engineering and Computing</title></titleInfo><titleInfo type="abbreviated"><title>Med. Biol. Eng. Comput.</title></titleInfo><genre type="Journal" displayLabel="Archive Journal"></genre><originInfo><dateIssued encoding="w3cdtf">1993-07-01</dateIssued><copyrightDate encoding="w3cdtf">1993</copyrightDate></originInfo><subject><genre>Engineering</genre><topic>Human Physiology</topic><topic>Neurosciences</topic><topic>Imaging / Radiology</topic><topic>Computer Applications</topic><topic>Biomedical Engineering</topic></subject><identifier type="ISSN">0140-0118</identifier><identifier type="eISSN">1741-0444</identifier><identifier type="JournalID">11517</identifier><identifier type="IssueArticleCount">21</identifier><identifier type="VolumeIssueCount">6</identifier><part><date>1993</date><detail type="volume"><number>31</number><caption>vol.</caption></detail><detail type="issue"><number>4</number><caption>no.</caption></detail><extent unit="pages"><start>325</start><end>332</end></extent></part><recordInfo><recordOrigin>IFMBE, 1993</recordOrigin></recordInfo></relatedItem><identifier type="istex">08C6E5E6A68ECA0F4FE560E514B45D9CEC9897C2</identifier><identifier type="DOI">10.1007/BF02446683</identifier><identifier type="ArticleID">BF02446683</identifier><identifier type="ArticleID">Art1</identifier><accessCondition type="use and reproduction" contentType="copyright">IFMBE, 1993</accessCondition><recordInfo><recordContentSource>SPRINGER</recordContentSource><recordOrigin>IFMBE, 1993</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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