ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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Which type of artifact appears echogenic and stems from gas bubbles as they vibrate due to the interaction with the ultrasound beam?

  1. Edge shadow

  2. Crosstalk

  3. Slice thickness

  4. Ring-down artifact

The correct answer is: Ring-down artifact

The type of artifact described in the question, which appears echogenic and is caused by gas bubbles vibrating in response to the ultrasound beam, is known as a "ring-down artifact." This artifact occurs when gas bubbles within a structure, such as the gastrointestinal tract or within a cyst, vibrate and produce a distinct echogenic pattern on the ultrasound image. The other options can be explained as follows: - Edge shadow artifact occurs when there is shadowing or darkening behind a sharply demarcated object. - Crosstalk is an artifact that occurs when there is interference or bleed-through from one ultrasound plane to the next. - Slice thickness artifact is caused by inadequate orientation of the ultrasound beam, leading to poor resolution and an artificial appearance of structures.

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