Abstract
Category: Echocardiography: 3-D,TEE, and Intracardiac Echo Background: We validated the accuracy of 3D echo mechanics for tracking left ventricular (LV) myocardial deformation in four 40-45 kg openchest pigs subjected to intermittent LAD ligation.
Abstract
Methods: Circumferential strain was mapped along multiple segments on a myocardial shell of 4D gated full-volume images acquired on a Toshiba Applio Artida system with a matrix transducer placed over the cardiac apex, using liver as a stand-off. Three triangles of sonomicrometry (sono) crystals were placed -just below the mitral valve at the mid level and just below the tips of the papillary muscle -to provide validation for circumferential strain.
Abstract
Baseline sequences in all the pigs showed -28 ± 6% uniform circumferential strain at the apex, -23 ± 6% at the mid level, and -21 ± 4% at the base level. There was close correlation for the segmental results to each other and to sono data for circumferential strain (r2 = 0.81). After partial temporary ligation (5 times in each pig) at the mid LAD level, during ischemia circumferential strain was paradoxically positive over the anterior and apical segments (up to -20% with a late minimal shortening of 5%). Processing of these high quality images had less than 8% interobserver variability for segmental circumferential strain calculations.
Abstract
Although this study focused on 4D volume data for circumferential strain, the same loops can be processed for radial, longitudinal, rotational or torsional deformations.

{'paper_id': '71209402', 'title': 'ADVANCED FEATURE TRACKING ON 4D ECHO IMAGES DEFINES ANTERIOR, SEPTAL AND APICAL DYSFUNCTION IN OPEN CHEST PIGS SUBJECTED TO INTERMITTENT LAD OCCLUSION', 's2_url': 'https://api.semanticscholar.org/CorpusID:71209402', 'source': 'S2ORC'}