SPI Exam Dumps | Which factor causes posterior acoustic enhancement?

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Question 81/99

Which factor causes posterior acoustic enhancement?

A. High-frequency transducer

B. Low-frequency transducer

C. Strongly attenuating structure

D. Weakly attenuating structure

Correct Answer: D

* High-Frequency Transducer: These provide better resolution but do not directly cause posterior enhancement.
* Low-Frequency Transducer: These provide better penetration but are not the cause of posterior enhancement.
* Strongly Attenuating Structure: This would cause acoustic shadowing rather than enhancement.
* Weakly Attenuating Structure: Structures that attenuate the ultrasound beam less than the surrounding tissues allow more sound waves to pass through, resulting in increased brightness or "enhancement" behind the structure.
References:
"Ultrasound Physics and Instrumentation" by Frank Miele
ARDMS Sonography Principles and Instrumentation study materials

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