ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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Which scanning angles will provide the most significant amount of Doppler shift to measure the peak velocity during a carotid duplex ultrasound?

  1. 0 or 90 degrees

  2. 90 or 180 degrees

  3. 115 or 180 degrees

  4. 0 or 180 degrees

The correct answer is: 0 or 180 degrees

During a carotid duplex ultrasound, the most significant amount of Doppler shift to measure the peak velocity is obtained when using scanning angles of 0 or 180 degrees. This is because a Doppler ultrasound measures the change in frequency of the sound waves reflected by moving red blood cells. When the Doppler angle is 0 degrees (parallel to blood flow) or 180 degrees (antiparallel to blood flow), it results in the greatest sensitivity to detect the maximum velocity of blood flow accurately. Options A, B, and C are not the best choices because angles other than 0 or 180 degrees reduce the accuracy of peak velocity measurement due to decreased sensitivity to the Doppler shift of blood flow velocity.

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