Which test verifies Doppler velocity accuracy?

Which test verifies Doppler velocity accuracy?

• A. Doppler flow phantom test
• B. Visual inspection
• C. External cleaning
• D. Receiver calibration

Answer: (A)

Verifying Doppler velocity accuracy requires a known reference flow. A Doppler flow phantom provides a controlled fluid flow with a precisely set speed inside a tissue-mimicking medium, so the Doppler system’s velocity measurements can be directly compared to the true value. This direct reference makes it the appropriate test for confirming that Doppler-derived velocities are accurate. Visual inspection only checks physical appearance, not measurement accuracy; external cleaning is about maintenance, not measurement validation; and receiver calibration focuses on electronics performance rather than matching a known flow velocity.

Verifying Doppler velocity accuracy requires a known reference flow. A Doppler flow phantom provides a controlled fluid flow with a precisely set speed inside a tissue-mimicking medium, so the Doppler system’s velocity measurements can be directly compared to the true value. This direct reference makes it the appropriate test for confirming that Doppler-derived velocities are accurate. Visual inspection only checks physical appearance, not measurement accuracy; external cleaning is about maintenance, not measurement validation; and receiver calibration focuses on electronics performance rather than matching a known flow velocity.