ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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What does it suggest when a sonographer notices that the colors in the middle of the map appear to be communicating with each other during a color Doppler exam of the carotid artery?

  1. Aliasing is Present.

  2. The flow in the carotid artery is bidirectional

  3. The flow in the carotid artery is unidirectional

  4. The wall filter is set too high.

The correct answer is: Aliasing is Present.

This suggests that there is an issue with the visualization of flow direction in the carotid artery during the color Doppler exam. Specifically, the colors in the middle of the map appear to "communicate" with each other, which could indicate that aliasing is present. Other options such as bidirectional or unidirectional flow or a high wall filter setting may also be possible causes, but they do not specifically pertain to the colors in the middle of the map communicating with each other.