ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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Which parameter is decreased by the ultrasound machine to evade the possibility of range ambiguity when the imaging depth is increased?

  1. Number of scan lines

  2. Persistence

  3. Pulse repetition frequency (PRF)

  4. Pulse repetition period (PRP)

The correct answer is: Persistence

To prevent range ambiguity when increasing imaging depth, the ultrasound machine decreases the pulse repetition frequency (PRF). By lowering the PRF, the machine allows more time for the ultrasound signals to travel to deeper tissues and return before the next pulse is emitted. This adjustment helps avoid overlapping echoes from different depths that can lead to confusion in image interpretation. Persistence, on the other hand, refers to the feature that blends previous ultrasound frames to reduce noise and improve image quality, but it is not directly related to preventing range ambiguity.

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