Table 1 Comparison of technical characteristics between color Doppler and high-frame rate VFI
From: High-frame rate vector flow imaging of the carotid bifurcation
Color Doppler | High-frame rate VFI | |
|---|---|---|
Parameters | ||
Acquisition technique | Line-by-line | Multiangle plane waves |
Scan time | Real time | 1.5 s |
Temporal resolution | 20–24 fps | 400–600 fps |
Flow visualization frame rate | 20–24 Hz | 20–30 Hz |
Qualitative evaluation | + | + |
Spatial resolution | + | ++ |
Flow direction estimation | Monodirectional | Multidirectional |
Velocity estimation | Mean velocity | True velocity magnitude |
Velocity vector measurement | Axial component | Axial & lateral components |
Quantitative evaluation | − | + |
Beams angle dependence | Dependent | Independent |
Hemodynamics | + | ++ |
Aliasing artifact | + | + |