Measurement of in-vivo local shear modulus by combining multiple phase offsets mr elastography.
Identifieur interne : 001D22 ( PubMed/Curation ); précédent : 001D21; suivant : 001D23Measurement of in-vivo local shear modulus by combining multiple phase offsets mr elastography.
Auteurs : M. Suga [Japon] ; T. Matsuda ; K. Minato ; O. Oshiro ; K. Chihara ; J. Okamoto ; O. Takizawa ; M. Komori ; T. TakahashiSource :
- Studies in health technology and informatics [ 0926-9630 ] ; 2001.
English descriptors
- KwdEn :
- Acoustic Stimulation, Algorithms, Animals, Biomechanical Phenomena, Elasticity, Humans, Image Processing, Computer-Assisted, Liver (anatomy & histology), Liver (physiology), Magnetic Resonance Imaging (methods), Muscle, Skeletal (anatomy & histology), Muscle, Skeletal (physiology), Phantoms, Imaging, Stress, Mechanical, Swine.
- MESH :
- anatomy & histology : Liver, Muscle, Skeletal.
- methods : Magnetic Resonance Imaging.
- physiology : Liver, Muscle, Skeletal.
- Acoustic Stimulation, Algorithms, Animals, Biomechanical Phenomena, Elasticity, Humans, Image Processing, Computer-Assisted, Phantoms, Imaging, Stress, Mechanical, Swine.
Abstract
To provide realistic surgical simulation, haptic feedback is important. In the existing surgical simulators, the fidelity of the deformation and haptic feedback is limited because they are based on the subjective evaluation of the expert-user and not on an objective model-based evaluation. To obtain elastic modulus of in-vivo human tissues, magnetic resonance elastography (MRE) was developed. MRE is a phase-contrast- based method that can visualize propagating strain waves in materials. The quantitative values of shear modulus can be calculated by estimating the local wavelength of the wave pattern. Low frequency mechanical motion must be used for soft tissue-like materials, because strain waves rapidly attenuate at higher frequency. Therefore, wavelength in MRE is long. It is difficult to estimate local wavelength with high spatial resolution especially from noisy MRE. In the MRE sequence, motion-sensitizing gradient (MSG) are synchronized with the mechanical cyclic motion. MRE with multiple initial phase offsets can be generated with increasing delays between the MSG and mechanical excitation. In this paper, we describe a method of measuring local wavelength with high spatial resolution by combining multiple phase offsets MRE. To confirm the reliability of this method, a computer simulation and phantom study were performed. The shear modulus measured with various elastic objects was well consistent with the value obtained by MRE and the mechanical method. The shear moduli of excised porcine liver and in-vivo human calf muscle were also analyzed by this method. on the subjective evaluation of an expert-user and not on objective model-based methods.
PubMed: 11604870
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Oshiro</name></author><author><name sortKey="Chihara, K" sort="Chihara, K" uniqKey="Chihara K" first="K" last="Chihara">K. Chihara</name></author><author><name sortKey="Okamoto, J" sort="Okamoto, J" uniqKey="Okamoto J" first="J" last="Okamoto">J. Okamoto</name></author><author><name sortKey="Takizawa, O" sort="Takizawa, O" uniqKey="Takizawa O" first="O" last="Takizawa">O. Takizawa</name></author><author><name sortKey="Komori, M" sort="Komori, M" uniqKey="Komori M" first="M" last="Komori">M. Komori</name></author><author><name sortKey="Takahashi, T" sort="Takahashi, T" uniqKey="Takahashi T" first="T" last="Takahashi">T. 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Matsuda</name></author><author><name sortKey="Minato, K" sort="Minato, K" uniqKey="Minato K" first="K" last="Minato">K. Minato</name></author><author><name sortKey="Oshiro, O" sort="Oshiro, O" uniqKey="Oshiro O" first="O" last="Oshiro">O. Oshiro</name></author><author><name sortKey="Chihara, K" sort="Chihara, K" uniqKey="Chihara K" first="K" last="Chihara">K. Chihara</name></author><author><name sortKey="Okamoto, J" sort="Okamoto, J" uniqKey="Okamoto J" first="J" last="Okamoto">J. Okamoto</name></author><author><name sortKey="Takizawa, O" sort="Takizawa, O" uniqKey="Takizawa O" first="O" last="Takizawa">O. Takizawa</name></author><author><name sortKey="Komori, M" sort="Komori, M" uniqKey="Komori M" first="M" last="Komori">M. Komori</name></author><author><name sortKey="Takahashi, T" sort="Takahashi, T" uniqKey="Takahashi T" first="T" last="Takahashi">T. Takahashi</name></author></analytic><series><title level="j">Studies in health technology and informatics</title><idno type="ISSN">0926-9630</idno><imprint><date when="2001" type="published">2001</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acoustic Stimulation</term><term>Algorithms</term><term>Animals</term><term>Biomechanical Phenomena</term><term>Elasticity</term><term>Humans</term><term>Image Processing, Computer-Assisted</term><term>Liver (anatomy & histology)</term><term>Liver (physiology)</term><term>Magnetic Resonance Imaging (methods)</term><term>Muscle, Skeletal (anatomy & histology)</term><term>Muscle, Skeletal (physiology)</term><term>Phantoms, Imaging</term><term>Stress, Mechanical</term><term>Swine</term></keywords><keywords scheme="MESH" qualifier="anatomy & histology" xml:lang="en"><term>Liver</term><term>Muscle, Skeletal</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Magnetic Resonance Imaging</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Liver</term><term>Muscle, Skeletal</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Acoustic Stimulation</term><term>Algorithms</term><term>Animals</term><term>Biomechanical Phenomena</term><term>Elasticity</term><term>Humans</term><term>Image Processing, Computer-Assisted</term><term>Phantoms, Imaging</term><term>Stress, Mechanical</term><term>Swine</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">To provide realistic surgical simulation, haptic feedback is important. In the existing surgical simulators, the fidelity of the deformation and haptic feedback is limited because they are based on the subjective evaluation of the expert-user and not on an objective model-based evaluation. To obtain elastic modulus of in-vivo human tissues, magnetic resonance elastography (MRE) was developed. MRE is a phase-contrast- based method that can visualize propagating strain waves in materials. The quantitative values of shear modulus can be calculated by estimating the local wavelength of the wave pattern. Low frequency mechanical motion must be used for soft tissue-like materials, because strain waves rapidly attenuate at higher frequency. Therefore, wavelength in MRE is long. It is difficult to estimate local wavelength with high spatial resolution especially from noisy MRE. In the MRE sequence, motion-sensitizing gradient (MSG) are synchronized with the mechanical cyclic motion. MRE with multiple initial phase offsets can be generated with increasing delays between the MSG and mechanical excitation. In this paper, we describe a method of measuring local wavelength with high spatial resolution by combining multiple phase offsets MRE. To confirm the reliability of this method, a computer simulation and phantom study were performed. The shear modulus measured with various elastic objects was well consistent with the value obtained by MRE and the mechanical method. The shear moduli of excised porcine liver and in-vivo human calf muscle were also analyzed by this method. on the subjective evaluation of an expert-user and not on objective model-based methods.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">11604870</PMID><DateCreated><Year>2001</Year><Month>10</Month><Day>17</Day></DateCreated><DateCompleted><Year>2002</Year><Month>02</Month><Day>14</Day></DateCompleted><DateRevised><Year>2013</Year><Month>11</Month><Day>21</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0926-9630</ISSN><JournalIssue CitedMedium="Print"><Volume>84</Volume><Issue>Pt 2</Issue><PubDate><Year>2001</Year></PubDate></JournalIssue><Title>Studies in health technology and informatics</Title><ISOAbbreviation>Stud Health Technol Inform</ISOAbbreviation></Journal><ArticleTitle>Measurement of in-vivo local shear modulus by combining multiple phase offsets mr elastography.</ArticleTitle><Pagination><MedlinePgn>933-7</MedlinePgn></Pagination><Abstract><AbstractText>To provide realistic surgical simulation, haptic feedback is important. In the existing surgical simulators, the fidelity of the deformation and haptic feedback is limited because they are based on the subjective evaluation of the expert-user and not on an objective model-based evaluation. To obtain elastic modulus of in-vivo human tissues, magnetic resonance elastography (MRE) was developed. MRE is a phase-contrast- based method that can visualize propagating strain waves in materials. The quantitative values of shear modulus can be calculated by estimating the local wavelength of the wave pattern. Low frequency mechanical motion must be used for soft tissue-like materials, because strain waves rapidly attenuate at higher frequency. Therefore, wavelength in MRE is long. It is difficult to estimate local wavelength with high spatial resolution especially from noisy MRE. In the MRE sequence, motion-sensitizing gradient (MSG) are synchronized with the mechanical cyclic motion. MRE with multiple initial phase offsets can be generated with increasing delays between the MSG and mechanical excitation. In this paper, we describe a method of measuring local wavelength with high spatial resolution by combining multiple phase offsets MRE. To confirm the reliability of this method, a computer simulation and phantom study were performed. The shear modulus measured with various elastic objects was well consistent with the value obtained by MRE and the mechanical method. The shear moduli of excised porcine liver and in-vivo human calf muscle were also analyzed by this method. on the subjective evaluation of an expert-user and not on objective model-based methods.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Suga</LastName><ForeName>M</ForeName><Initials>M</Initials><AffiliationInfo><Affiliation>Nara Institute of Science and Technology, Nara, Japan. suga@itc.aist-nara.ac.jp</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Matsuda</LastName><ForeName>T</ForeName><Initials>T</Initials></Author><Author ValidYN="Y"><LastName>Minato</LastName><ForeName>K</ForeName><Initials>K</Initials></Author><Author ValidYN="Y"><LastName>Oshiro</LastName><ForeName>O</ForeName><Initials>O</Initials></Author><Author ValidYN="Y"><LastName>Chihara</LastName><ForeName>K</ForeName><Initials>K</Initials></Author><Author ValidYN="Y"><LastName>Okamoto</LastName><ForeName>J</ForeName><Initials>J</Initials></Author><Author ValidYN="Y"><LastName>Takizawa</LastName><ForeName>O</ForeName><Initials>O</Initials></Author><Author ValidYN="Y"><LastName>Komori</LastName><ForeName>M</ForeName><Initials>M</Initials></Author><Author ValidYN="Y"><LastName>Takahashi</LastName><ForeName>T</ForeName><Initials>T</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>Netherlands</Country><MedlineTA>Stud Health Technol Inform</MedlineTA><NlmUniqueID>9214582</NlmUniqueID><ISSNLinking>0926-9630</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName MajorTopicYN="N" UI="D000161">Acoustic Stimulation</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D000465">Algorithms</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D000818">Animals</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D001696">Biomechanical Phenomena</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D004548">Elasticity</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D006801">Humans</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D007091">Image Processing, Computer-Assisted</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D008099">Liver</DescriptorName><QualifierName MajorTopicYN="Y" UI="Q000033">anatomy & histology</QualifierName><QualifierName MajorTopicYN="N" UI="Q000502">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D008279">Magnetic Resonance Imaging</DescriptorName><QualifierName MajorTopicYN="Y" UI="Q000379">methods</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D018482">Muscle, Skeletal</DescriptorName><QualifierName MajorTopicYN="Y" UI="Q000033">anatomy & histology</QualifierName><QualifierName MajorTopicYN="N" UI="Q000502">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D019047">Phantoms, Imaging</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D013314">Stress, Mechanical</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D013552">Swine</DescriptorName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2001</Year><Month>10</Month><Day>18</Day><Hour>10</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2002</Year><Month>2</Month><Day>15</Day><Hour>10</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2001</Year><Month>10</Month><Day>18</Day><Hour>10</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">11604870</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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