Doppler is an integral part of diagnostic medical sonography. These days, it's hard to imagine an ultrasound exam in which Doppler does not play a key role.
The following videos will give you a good introduction to this important modality.
1. An overview of basic Doppler principles.
2. An overview of the four primary Doppler modalities that are used in diagnostic ultrasound.
3. A detailed look at color Doppler
4. A detailed look at pulsed Doppler
5. A detailed look at power Doppler
6. An introduction to Tissue Doppler.