Arq Bras Cardiol: Imagem cardiovasc 2017; 30(3): 87-91

Comparison of Block-Matching and Optical Flow in Strain Echocardiography Analysis

DOI: 10.5935/2318-8219.20170019

Abstract

Introduction

Different technologies have been used to evaluate left ventricular systolic function. Of particular interest is the two-dimensional strain echocardiography (2DSTE). Two different methods have been used to quantify myocardial strain by 2DSTE: block matching and optical flow. Both are present in commercially available echocardiographs. However, there is no consensus as to whether the longitudinal strain measures using these methods are overlapping.

Objective

To compare the longitudinal myocardial strain peak values obtained through 2DSTE using two different methods (block matching x optical flow).

Method

Strain measurements in 16 left ventricular myocardial segments were taken as recommended by the American Society of Echocardiography using block matching (Vivid 7, GE, Horten, Norway) and, immediately after, using optical flow (My Lab 60, Esaote, Florence, Italy) in a randomized way and their values were compared.

Results

There were 28 individuals aged 27.9 ± 7.7, of whom 50% were male and all with an ejection fraction greater than 55%. Global longitudinal strain was higher using block matching (p = 0.02). In the analysis of the 16 segments, 10 segments had different values, especially the apical segments.

Conclusion

Longitudinal myocardial strain values obtained by different methods are not overlapping and must be used with caution. Normality values also vary according to the manufacturer and the method used. (Arq Bras Cardiol: Imagem cardiovasc. 2017;30(3):87-91)