Table 1 Parameters based on instantaneous and/or local results are less reliable than those based on a proper combination of a large number of results
More reliable (time-integral parameters) | Less reliable (instantaneous parameters) | Notes |
|---|---|---|
Displacements | Velocities | Radial motion more accurate than tangential (e.g. rotation) because the tissue-cavity interfaces is a better feature that those found along the tissue. |
Strain | Strain-rate | Values along the borders (longitudinal and circumferential strain) are more accurate than radial ones because the latter is a difference between close structures. |
Properties of time-curve profiles (phase of harmonics, principal components) | Instantaneous values (peak, time to peak) | Instantaneous measures present unavoidable estimation errors which are smoothed-out when a larger number of measures is combined together. |
More reliable (spatial-integral values) | Less reliable (local values) | Â |
Global Strain | Segmental strain | Local measures present unavoidable estimation errors which are smoothed-out when a larger number of measures is combined together. |
Measures built by numerous spatial values | Indicators built by values at single points |