Now some learners may feel like the “other doppler modes” such as Pulse wave, Continuous wave, and Tissue Doppler are very advanced settings. However, the same principles of color Doppler apply to these other Doppler modes as well. The ultrasound probe is just detecting flow or motion either TOWARDS or AWAY from it. If it is towards the probe there will be a positive deflection and if it is away from the probe there will be a negative deflection.
Here is an illustration that sums up the those Doppler modes: