NDLI: P1A-5 Analysis of 3D Motion Effects in Myocardial Elastography

Content Provider	IEEE Xplore Digital Library
Author	Wei-Ning Lee Konofagou, E.E.
Copyright Year	2006
Description	Author affiliation: Dept. of Biomed. Eng., Columbia Univ., New York, NY (Wei-Ning Lee; Konofagou, E.E.)
Abstract	In 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 finite 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
Starting Page	1217
Ending Page	1220
File Size	3707774
Page Count	4
File Format	PDF
ISBN	1424402018
ISSN	10510117
DOI	10.1109/ULTSYM.2006.310
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-02
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Motion analysis Myocardium Motion estimation Capacitive sensors Estimation error Decorrelation Filling Finite element methods Convolution Signal generators
Content Type	Text
Resource Type	Article

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