Comparison of longitudinal myocardial tissue velocity, strain, and strain rate measured by two-dimensional speckle tracking and by color tissue Doppler imaging in healthy dogs.

Objectives: Two-dimensional speckle tracking (2D-ST) is a new method to measure tissue velocity (TV), strain and strain rate (SR), but it is unclear if results are comparable to color tissue Doppler imaging (TDI). The objective was therefore to compare the two modalities 2D-ST and TDI.

Animals: 100 healthy dogs

Methods: TDI images were acquired from the interventricular septal wall (IVS) and the left ventricular free wall (LVFW) to measure longitudinal TV, strain, and SR, and grayscale images were collected for 2D-ST analysis.