ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

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While using pulsed wave Doppler, the sonographer believes that the measurements are not accurate. After switching to a 4.5 MHz continuous wave (CW) Doppler at a depth of 5 cm, what will the maximum velocity cap be?

  1. There will not be a maximum velocity cap with CW Doppler.

  2. 45 cm/s

  3. 150 cm/s

  4. This cannot be determined with the given information.

The correct answer is: There will not be a maximum velocity cap with CW Doppler.

CW Doppler does not have a maximum velocity cap because it continuously emits and receives sound waves, allowing for accurate measurements of high velocities without aliasing. This is in contrast to pulsed wave Doppler, which has a limited sampling rate and can result in inaccurate measurements of high velocities. Therefore, option A is correct and the other options are incorrect. Option B and C provide specific velocity values which may not be applicable in all cases, while option D suggests that there may be a way to determine the maximum velocity cap with the given information, which is not the case.

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