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Conference Paper: Analysis of 3D motion effects in myocardial elastography

TitleAnalysis of 3D motion effects in myocardial elastography
Authors
KeywordsAxial
Circumferential Strain
Cross-Correlation
Elastography
Elevational
Finite-Element
Lateral
Myocardial
Radial Strain
Recorrelation
Strain
Issue Date2006
Citation
Proceedings - Ieee Ultrasonics Symposium, 2006, v. 1, p. 1217-1220 How to Cite?
AbstractIn this paper, we investigate the elevational beamwidth and the extent of 3D decorrelation on 3D motion estimation of multiple short-axis slices under a previously established theoretical framework, which simulated two sequences, including passive filling and active contraction, in normal and ischemic canine finite-element (FE) left ventricular models. A 3D convolutional image formation model was developed to generate successive RF signals in 3D. Incremental lateral and axial motion components were estimated from lateral-axial plane using 1D cross-correlation and recorrelation techniques in a 2D search with a 1D matching kernel of 3 mm and 80% overlap. Similarly, the elevational displacement was estimated from elevational-axial plane using the same strategy. The cumulative 3D motion was obtained by accumulating the incremental motion from end-diastole to end-systole, while the cumulative lateral and axial strains were obtained using a least-squares strain estimator on the cumulative in-plane motion. Radial and circumferential strains, independent of the orientation of the transducer, were also computed from the in-plane finte strains. The elastographic estimation error was estimated by calculating the relative difference between the FEA and elastographic results. When the elevational beamwidth increased from 2 to 4 mm, the mean absolute differences for cumulative in-plane motion and systolic strains in both the normal and the ischemic cases, decreased. However, the larger the elevational beamwidth was, the larger elevational displacement estimation error was obtained. The findings showed that the elevational beamwidth of 2 mm was the optimal value for both in-plane deformation and out-of-plane motion estimation. In summary, even at the presence of physiologic elevational motion, the in-plane elastographic estimates remained at good agreement with the FE solutions. Error analyses indicated thus a substantial improvement in the performance of the recorrelation technique at various short-axis slices of the 3D left ventricle and at elevational beamwidths well within the clinical equipment range. © 2006 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/167116
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorLee, WNen_US
dc.contributor.authorKonofagou, EEen_US
dc.date.accessioned2012-09-28T04:04:17Z-
dc.date.available2012-09-28T04:04:17Z-
dc.date.issued2006en_US
dc.identifier.citationProceedings - Ieee Ultrasonics Symposium, 2006, v. 1, p. 1217-1220en_US
dc.identifier.issn1051-0117en_US
dc.identifier.urihttp://hdl.handle.net/10722/167116-
dc.description.abstractIn this paper, we investigate the elevational beamwidth and the extent of 3D decorrelation on 3D motion estimation of multiple short-axis slices under a previously established theoretical framework, which simulated two sequences, including passive filling and active contraction, in normal and ischemic canine finite-element (FE) left ventricular models. A 3D convolutional image formation model was developed to generate successive RF signals in 3D. Incremental lateral and axial motion components were estimated from lateral-axial plane using 1D cross-correlation and recorrelation techniques in a 2D search with a 1D matching kernel of 3 mm and 80% overlap. Similarly, the elevational displacement was estimated from elevational-axial plane using the same strategy. The cumulative 3D motion was obtained by accumulating the incremental motion from end-diastole to end-systole, while the cumulative lateral and axial strains were obtained using a least-squares strain estimator on the cumulative in-plane motion. Radial and circumferential strains, independent of the orientation of the transducer, were also computed from the in-plane finte strains. The elastographic estimation error was estimated by calculating the relative difference between the FEA and elastographic results. When the elevational beamwidth increased from 2 to 4 mm, the mean absolute differences for cumulative in-plane motion and systolic strains in both the normal and the ischemic cases, decreased. However, the larger the elevational beamwidth was, the larger elevational displacement estimation error was obtained. The findings showed that the elevational beamwidth of 2 mm was the optimal value for both in-plane deformation and out-of-plane motion estimation. In summary, even at the presence of physiologic elevational motion, the in-plane elastographic estimates remained at good agreement with the FE solutions. Error analyses indicated thus a substantial improvement in the performance of the recorrelation technique at various short-axis slices of the 3D left ventricle and at elevational beamwidths well within the clinical equipment range. © 2006 IEEE.en_US
dc.languageengen_US
dc.relation.ispartofProceedings - IEEE Ultrasonics Symposiumen_US
dc.subjectAxialen_US
dc.subjectCircumferential Strainen_US
dc.subjectCross-Correlationen_US
dc.subjectElastographyen_US
dc.subjectElevationalen_US
dc.subjectFinite-Elementen_US
dc.subjectLateralen_US
dc.subjectMyocardialen_US
dc.subjectRadial Strainen_US
dc.subjectRecorrelationen_US
dc.subjectStrainen_US
dc.titleAnalysis of 3D motion effects in myocardial elastographyen_US
dc.typeConference_Paperen_US
dc.identifier.emailLee, WN: wnlee@hku.hken_US
dc.identifier.authorityLee, WN=rp01663en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1109/ULTSYM.2006.310en_US
dc.identifier.scopuseid_2-s2.0-78649376044en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78649376044&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume1en_US
dc.identifier.spage1217en_US
dc.identifier.epage1220en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridLee, WN=22634980600en_US
dc.identifier.scopusauthoridKonofagou, EE=7005877325en_US

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