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Titolo:
In vivo finite element model-based image analysis of pacemaker lead mechanics
Autore:
Baxter, WW; McCulloch, AD;
Indirizzi:
Univ Calif San Diego, Dept Bioengn, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 ioengn, La Jolla, CA 92093 USA
Titolo Testata:
MEDICAL IMAGE ANALYSIS
fascicolo: 4, volume: 5, anno: 2001,
pagine: 255 - 270
SICI:
1361-8415(200112)5:4<255:IVFEMI>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
LARGE ELASTIC DEFORMATIONS; ATRIAL J-LEAD; VENTRICULAR MYOCARDIUM; CORONARY-ARTERIES; MOTION ANALYSIS; MEDICAL IMAGES; TRACKING; WIRE; RECONSTRUCTION; EXTRACTION;
Keywords:
elastica; finite element; active contour;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: McCulloch, AD Univ Calif San Diego, Dept Bioengn, 9500 Gilman Dr, La Jolla, CA 92093 USA Univ Calif San Diego 9500 Gilman Dr La Jolla CA USA 92093 SA
Citazione:
W.W. Baxter e A.D. McCulloch, "In vivo finite element model-based image analysis of pacemaker lead mechanics", MED IMAGE A, 5(4), 2001, pp. 255-270

Abstract

Background: Fractures of implanted pacemaker leads are currently identified by inspecting radiographic images without making full use of a priori known material and structural information. Moreover, lead designers are unableto incorporate clinical image data into analyses of lead mechanics. Methods: A novel finite element/active contour method was developed to quantify the in vivo mechanics of implanted leads by estimating the distributions of stress, strain, and traction using biplane videoradiographic images. The nonlinear equilibrium equations governing a thin elastic beam undergoing 3-D large rotation were solved using one-dimensional isoparametric finite elements. External forces based on local image greyscale values were computed from each pair of images using a perspective transformation governing the relationship between the image planes. Results: Cantilever beam forward solution results were within 0.2% of the analytic solution for a wide range of applied loads. The finite element/active contour model was able to reproduce the principal curvatures of a synthetic helix within 3% of the analytic solution and estimates of the helix's geometric torsion were within 20% of theanalytic solution. Applying the method to biplane videoradiographic imagesof a lead acutely implanted in an anesthetized dog resulted in expected variations in curvature and bending stress between compliant and rigid segments of the lead. Conclusions: By incorporating knowledge about lead geometric and material properties, the 3-D finite element/active contour method regularizes the image reconstruction problem and allows for more quantitative and automatic assessment of implanted lead mechanics. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 13:07:48