Key result
Varying the region of interest width by one step from the automatic setting significantly altered global longitudinal and circumferential strain and strain rate measurements (all P<0.000).
Why the study?
Does the region of interest width influence two-dimensional speckle tracking-based measurements of strain and strain rate in healthy subjects?
Observational (n=20)
Does the region of interest width influence two-dimensional speckle tracking-based measurements of strain and strain rate in healthy subjects?
The chosen region of interest width significantly biases two-dimensional speckle tracking-derived strain and strain rate measurements, highlighting the need for precise ROI definition.
Answers are grounded in this paper and cite their sources.
ROI width variations may bias clinical strain values; leaves open optimal standardization for reproducible research use.
AIMS: There are significant variations in the published normal values of two-dimensional speckle tracking-derived strain and strain rate. These occur even when authors use the same software. To measure strain, the operator creates a region of interest (ROI) to define the myocardium to be analyzed. The purpose of this study was to test the hypothesis that measurements vary significantly with the chosen ROI width. METHODS AND RESULTS: In 20 healthy subjects (11 males, mean age 17.6 ± 6.18 years) an apical four-chamber view (4CH) and parasternal short-axis view (SAX) were analyzed. Initially ROI width was set automatically by the software. Two subsequent measurements were obtained from each cine loop by choosing the ROI width one step narrower and one step wider than the automatic ROI width. The mean differences between the measurements of narrower and automatic ROI and between automatic and wider ROI were -1.8 ± 0.7% and -0.9 ± 0.5% for global longitudinal strain (SL), -2.2 ± 0.6% and -1.7 ± 0.7% for global circumferential strain (SC), -0.10 ± 0.06/sec and -0.07 ± 0.06/sec for global longitudinal strain rate (SrL), and -0.15 ± 0.09/sec and -0.12 ± 0.07/sec for global circumferential strain rate (SrC) (all P < 0.000). This corresponds to a relative difference to the mean of both measurements of -4.4 to -11.0%. CONCLUSION: Layer-specific myocardial deformation and curvature dependency lead to an inverse correlation between the chosen ROI width and strain and strain rate measurements. Just one step of ROI-width change leads to a significant bias. Precise ROI-width definition is essential but technical factors limit its feasibility.
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Spriestersbach et al. (2014) conducted an observational in Healthy subjects (n=20). Region of interest (ROI) width variation vs. Automatic ROI width was evaluated on Global longitudinal and circumferential strain and strain rate (MD -1.8% and -0.9% for SL; -2.2% and -1.7% for SC, p=< 0.000). Varying the region of interest width by one step from the automatic setting significantly altered global longitudinal and circumferential strain and strain rate measurements (all P<0.000).
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