Differentiate pulsed-wave Doppler and continuous-wave Doppler in measuring valve velocities.

• A. PW samples at a single depth with range resolution and limited velocity range; CW samples along the entire Doppler beam with unlimited velocity range but no depth resolution; use PW for quantifying velocity at a specific location, CW for high-velocity jets.
• B. PW samples along the entire Doppler beam with unlimited velocity range; CW samples at a single depth with limited velocity.
• C. PW and CW have identical sampling properties.
• D. PW provides unlimited velocity range; CW provides depth resolution only.

Answer: (A)