title: Accuracy of real-time single- and multi-beat 3-d speckle tracking echocardiography in vitro.
abstract: With little data published on the accuracy of cardiac 3-D strain measurements, we investigated the agreement between 3-D echocardiography and sonomicrometry in an in vitro model with a polyvinyl alcohol phantom. A cardiac scanner with a 3-D probe was used to acquire recordings at 15 different stroke volumes at a heart rate of 60 beats/min, and eight different stroke volumes at a heart rate of 120 beats/min. Sonomicrometry was used as a reference, monitoring longitudinal, circumferential and radial lengths. Both single- and multi-beat acquisitions were recorded. Strain values were compared with sonomicrometer strain using linear correlation coefficients and Bland-Altman analysis. Multi-beat acquisition showed good agreement, whereas real-time images showed less agreement. The best correlation was obtained for a heart rate 60 of beats/min at a volume rate 36.6 volumes/s.
authors.affiliation: Institute of Medicine, University of Bergen, Bergen, Norway.
authors.forename: Johannes Just
authors.initials: JJ
authors.lastname: Hjertaas
authors.forename: Henrik
authors.initials: H
authors.lastname: Fosså
authors.forename: Grete Lunestad
authors.initials: GL
authors.lastname: Dybdahl
authors.forename: Renate
authors.initials: R
authors.lastname: Grüner
authors.forename: Per
authors.initials: P
authors.lastname: Lunde
authors.forename: Knut
authors.initials: K
authors.lastname: Matre
mesh_terms: D000465:Algorithms; D003199:Computer Systems; D019560:Echocardiography, Three-Dimensional / Q000295:instrumentation / Q000379:methods*; D054459:Elasticity Imaging Techniques / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012984:Software