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

At 90 degrees, cos(90°) = 0, making the denominator of the Doppler equation zero, which produces a mathematically undefined (infinite) velocity value.

Question 2

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

Accepted Answer

Remove low-frequency signals from the spectral display

Answer

The wall filter (high-pass filter) eliminates low-frequency Doppler signals produced by slow-moving vessel walls and surrounding tissue, reducing clutter near the baseline.

Question 3

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

Accepted Answer

Decreased PSV with prolonged systolic acceleration time

Answer

Tardus parvus (Latin: slow-small) describes the dampened, delayed post-stenotic waveform with reduced peak systolic velocity and a slow, rounded systolic upstroke.

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

Decreasing sample volume size changes the amount of vessel sampled but does not affect the PRF or the Nyquist limit, making it ineffective for correcting aliasing.

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

The y-axis in spectral Doppler displays the Doppler frequency shift, which is converted to velocity using angle correction, while the x-axis represents time.

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI Spectral Doppler Waveform Analysis 2