SPI Exam Dumps | Which parameter is directly proportional to the Doppler shift frequency?

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Question 67/99

Which parameter is directly proportional to the Doppler shift frequency?

A. Propagation speed

B. Size of moving reflector

C. Ultrasound beam intensity

D. Velocity of the moving reflector

Correct Answer: D

Comprehensive and Detailed Explanation From Exact Extract:
The Doppler equation demonstrates that the Doppler shift frequency is directly proportional to the velocity of the moving reflector (typically red blood cells).
The Doppler shift formula is:
Doppler shift = (2 × transducer frequency × reflector velocity × cos #) / propagation speed According to sonography instrumentation references:
"The Doppler shift frequency increases as the velocity of the moving reflector increases. This relationship is linear when all other factors remain constant." Therefore, the correct answer is D: Velocity of the moving reflector.
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