What limitation is present when you use high-PRF Doppler?

• A. Frame rate
• B. Sensitivity to slow flow
• C. Range resolution
• D. Both C and D

Answer: (D)

High PRF Doppler raises the sampling rate in time, which lets you measure higher velocities without aliasing and improves temporal resolution. But this comes with trade-offs. The higher sampling and the associated clutter suppression tend to reduce sensitivity to very slow flow, because small Doppler shifts near the baseline are more likely to be attenuated. At the same time, depth discrimination can be affected; the rapid sampling and processing can slightly degrade range resolution or make it harder to separate closely spaced reflectors in depth in some setups.

So the limitation you see with high-PRF Doppler is a combination of reduced sensitivity to slow flow and a potential impact on range (depth) resolution. That’s why the option describing both of these aspects is the best match.