October 1, 2003Echocardiography
Effect of Angular Error on Tissue Doppler Velocities and Strain
Why the study?
Does correcting for angular error in tissue Doppler imaging significantly alter longitudinal strain measurements?
Population
43 individuals undergoing echocardiography (apical two- and four-chamber views)
Comparison
Strain calculation using velocities corrected… vs Strain calculation using uncorrected velocities
Design
Cross-sectional
Authors
Discussion
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Overview
Minimal angular correction impact on TDI strain may support omission; hypothesis-generating pending prospective validation.
Key Points
- To investigate the clinical impact of ultrasound Doppler angular error on myocardial velocity measurements and longitudinal strain calculations.
- Recorded apical two- and four-chamber echocardiograms in 43 individuals and manually outlined the myocardium in each image.
- Calculated myocardial strain from uncorrected velocities and from velocities backprojected onto the longitudinal direction across 12 segments per individual.
- Differences between strain calculated from corrected versus uncorrected velocities were statistically insignificant in 5 segments and within decimal ranges across 11 of 12 segments.
- The largest discrepancies between uncorrected and corrected strain values occurred in the apical segments.
- Longitudinal strain demonstrated greater robustness against angular misalignment than raw velocity measurements, indicating that angular error correction can be safely omitted in clinical practice.
Structured PICO
Does correcting for angular error in tissue Doppler imaging significantly alter longitudinal strain measurements?
P
Population
43 individuals undergoing echocardiography (apical two- and four-chamber views)
I
Intervention
Strain calculation using velocities corrected for angular error (backprojecting measured velocities onto the longitudinal direction)
C
Comparator
Strain calculation using uncorrected velocities
O
Outcome
Difference between strain values calculated from corrected and uncorrected velocities across 12 myocardial segmentssurrogate
Angular error has minimal impact on longitudinal strain in tissue Doppler imaging, suggesting that correction for this error can be safely omitted in clinical settings.
Cite This Study
Storaa et al. (2003) studied this question.