Is strain by Speckle Tracking Echocardiography dependent on user controlled spatial and temporal smoothing? An experimental porcine study
Open Access
- 22 August 2013
- journal article
- research article
- Published by Springer Science and Business Media LLC in Cardiovascular Ultrasound
- Vol. 11 (1), 32
- https://doi.org/10.1186/1476-7120-11-32
Abstract
Speckle Tracking Echocardiography (STE) strain analysis relies on both spatial and temporal smoothing. The user is often allowed to adjust these smoothing parameters during analysis. This experimental study investigates how different degrees of user controllable spatial and temporal smoothing affect global and regional STE strain values in recordings obtained from normal and ischemic myocardium. In seven anesthetized pigs, left ventricular short- and long-axis B-mode cineloops were recorded before and after left anterior descending coronary artery occlusion. Peak- and postsystolic global STE strain in the radial, circumferential and longitudinal direction as well as corresponding regional strain in the anterior and posterior walls were measured. During post-processing, strain values were obtained with three different degrees of both spatial and temporal smoothing (minimum, factory default and maximum), resulting in nine different combinations. All parameters for global and regional longitudinal strain were unaffected by adjustments of spatial and temporal smoothing in both normal and ischemic myocardium. Radial and circumferential strain depended on smoothing to a variable extent, radial strain being most affected. However, in both directions the different combinations of smoothing did only result in relatively small changes in the strain values. Overall, the maximal strain difference was found in normal myocardium for peak systolic radial strain of the posterior wall where strain was 22.0 ± 2.2% with minimal spatial and maximal temporal smoothing and 30.9 ± 2.6% with maximal spatial and minimal temporal smoothing (P < 0.05). Longitudinal strain was unaffected by different degrees of user controlled smoothing. Radial and circumferential strain depended on the degree of smoothing. However, in most cases these changes were small and would not lead to altered conclusions in a clinical setting. Furthermore, smoothing did not affect strain variance. For all strain parameters, variance remained within the corresponding interobserver variance.Keywords
This publication has 33 references indexed in Scilit:
- Echocardiographic Assessment of Myocardial StrainJournal of the American College of Cardiology, 2011
- Left ventricular strain, rotation, and torsion as markers of acute myocardial ischemiaAmerican Journal of Physiology-Heart and Circulatory Physiology, 2011
- Current and Evolving Echocardiographic Techniques for the Quantitative Evaluation of Cardiac Mechanics: ASE/EAE Consensus Statement on Methodology and Indications Endorsed by the Japanese Society of EchocardiographyEuropean Heart Journal - Cardiovascular Imaging, 2011
- Assessment of Myocardial Mechanics Using Speckle Tracking Echocardiography: Fundamentals and Clinical ApplicationsJournal of the American Society of Echocardiography, 2010
- Two dimensional speckle tracking echocardiography: basic principlesHeart, 2010
- Reduced and delayed untwisting of the left ventricle in patients with hypertension and left ventricular hypertrophy: a study using two-dimensional speckle tracking imaging.European Heart Journal, 2008
- Strain and strain rate deformation parameters: from tissue Doppler to 2D speckle trackingThe International Journal of Cardiovascular Imaging, 2007
- Assessment of myocardial regional strain and strain rate by tissue tracking in B-mode echocardiogramsJapanese Journal of Clinical Oncology, 2006
- Measurement of Strain and Strain Rate by Echocardiography: Ready for Prime Time?Journal of the American College of Cardiology, 2006
- Two-dimensional strain–a novel software for real-time quantitative echocardiographic assessment of myocardial functionJournal of the American Society of Echocardiography, 2004