SPI Exam Dumps | Which describes the reflected frequency when a reflector is moving toward the sound source?

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Question 17/99

Which describes the reflected frequency when a reflector is moving toward the sound source?

A. Increased

B. Decreased

C. Unchanged

D. Attenuated

Correct Answer: A

When a reflector (such as red blood cells) is moving toward the sound source, the frequency of the reflected sound waves increases. This phenomenon is known as the Doppler effect. The frequency shift occurs because the motion of the reflector compresses the sound waves, leading to a higher frequency than the emitted frequency. This increased frequency is what the Doppler ultrasound system detects and uses to calculate the velocity of the moving reflector.
ARDMS Sonography Principles and Instrumentation guidelines
Hoskins, P. R., Thrush, A., Martin, K., & Whittingham, T. A. (2010). Diagnostic Ultrasound: Physics and Equipment.

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