ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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For reflection to take place, which situation must exist?

  1. There must be little difference of the impedances at soft-tissue boundaries.

  2. Normal incidence and identical impedances must be present.

  3. Oblique incidence must occur.

  4. The border of two different tissues must have different impedances.

The correct answer is: The border of two different tissues must have different impedances.

For reflection to occur in ultrasound imaging, the key factor is the presence of a significant difference in acoustic impedances at the interface between two tissues. This difference leads to a portion of the ultrasound beam being reflected back towards the transducer, which helps in producing the images we see during an ultrasound examination. Therefore, the correct answer is D because the difference in impedances at the boundary of two tissues is essential for reflection to occur. Options A, B, and C are not correct because they do not accurately describe the necessary conditions for reflection in ultrasound imaging.

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