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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

From: Principles of cardiovascular magnetic resonance feature tracking and echocardiographic speckle tracking for informed clinical use

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)  
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