ARDMS SPI Spectral Doppler Waveform Analysis 2

Question 1

When the Doppler angle correction cursor is positioned at 90 degrees, the calculated velocity will be:

Accepted Answer

Infinite or mathematically undefined

Answer

Doubled compared to the true velocity

Answer

Halved compared to the true velocity

Answer

Equal to the true velocity

Question 2

Increasing the wall filter setting on a spectral Doppler display will:

Accepted Answer

Remove low-frequency signals from the spectral display

Answer

Remove high-frequency signals from the spectral display

Answer

Increase the Nyquist limit

Answer

Decrease the pulse repetition frequency

Question 3

A 'tardus parvus' waveform observed distal to a stenosis is characterized by:

Accepted Answer

Decreased PSV with prolonged systolic acceleration time

Answer

Increased PSV with normal systolic acceleration time

Answer

Normal PSV with absent diastolic flow

Answer

Increased RI with elevated diastolic velocities

Question 4

To correct aliasing on a spectral Doppler display, which of the following would NOT be an effective solution?

Accepted Answer

Decreasing the sample volume gate size

Answer

Increasing the pulse repetition frequency (PRF)

Answer

Shifting the spectral baseline

Answer

Using a lower transmit frequency transducer

Question 5

In a standard spectral Doppler display, the vertical (y-axis) represents:

Accepted Answer

Doppler frequency shift (displayed as velocity after angle correction)

Answer

Time elapsed during the cardiac cycle

Answer

Relative signal power or amplitude

Answer

Depth of the sample volume gate

Question 6

On a spectral Doppler display, flow moving AWAY from the transducer will appear:

Accepted Answer

Below the baseline as a negative deflection

Answer

Above the baseline as a positive deflection

Answer

Simultaneously above and below the baseline

Answer

At the baseline without deflection

Question 7

Which of the following best describes a low-resistance Doppler waveform?

Accepted Answer

Continuous forward flow throughout diastole with elevated end-diastolic velocity

Answer

Triphasic flow pattern with reversal in early diastole

Answer

Sharp systolic peak with absent end-diastolic flow

Answer

Monophasic waveform with uniformly very low velocities