What are the technical factors involved in the application of Doppler wave indices?
Utilization of good quality spectral data to calculate the indices.
Most indices are calculated using the maximum Doppler frequency.
The mean Doppler frequency displacement is very sensitive to alignment and sample volume size.
Waveform indices are insensitive to the angle formed between the beam and the vessel.
In obstetric applications, the wall filter should be set to low values, generally 50-100 Hz.
The most appropriate index or measurement for each application can be determined from the literature.