ARDMS Echo Doppler Echocardiography

Question 1

Which Doppler modality provides the highest velocity resolution and is best for measuring high-velocity jets?

Accepted Answer

Continuous-wave Doppler

Answer

Pulsed-wave Doppler

Answer

Color flow Doppler

Answer

Tissue Doppler imaging

Question 2

Aliasing on pulsed-wave Doppler occurs when the measured velocity exceeds:

Accepted Answer

Half the pulse repetition frequency (Nyquist limit)

Answer

The pulse repetition frequency

Answer

The carrier frequency

Answer

The frame rate

Question 3

In the Doppler equation, which angle between the ultrasound beam and blood flow direction yields the most accurate velocity measurement?

Accepted Answer

0 degrees (parallel alignment)

Answer

90 degrees

Answer

60 degrees

Answer

45 degrees

Question 4

What does the velocity-time integral (VTI) of the LVOT represent?

Accepted Answer

Stroke distance (distance blood travels per beat)

Answer

Peak LV systolic pressure

Answer

Mean aortic gradient

Answer

LVOT cross-sectional area

Question 5

Tissue Doppler imaging (TDI) measures velocities of which structure?

Accepted Answer

Myocardium and cardiac walls

Answer

Red blood cells in cardiac chambers

Answer

Pulmonary venous flow

Answer

Aortic root motion

Question 6

Which color flow Doppler finding is characteristic of mitral regurgitation?

Accepted Answer

Systolic mosaic jet from LV into LA

Answer

Diastolic jet from LA into LV

Answer

Diastolic jet from aorta into LV

Answer

Systolic jet from RV into PA