Doppler Echocardiography Flashcards
6 cards from real ARDMS ECHO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Doppler Echocardiography flashcards as text
Which Doppler modality provides the highest velocity resolution and is best for measuring high-velocity jets?
Answer: Continuous-wave Doppler
Continuous-wave Doppler has no aliasing limit and can measure high-velocity jets such as severe aortic stenosis or regurgitation.
Aliasing on pulsed-wave Doppler occurs when the measured velocity exceeds:
Answer: Half the pulse repetition frequency (Nyquist limit)
Aliasing occurs when blood velocity exceeds the Nyquist limit (½ PRF), causing the signal to wrap around the baseline.
In the Doppler equation, which angle between the ultrasound beam and blood flow direction yields the most accurate velocity measurement?
Answer: 0 degrees (parallel alignment)
At 0 degrees (parallel alignment), cos θ = 1, providing the most accurate velocity measurement with no angular error.
What does the velocity-time integral (VTI) of the LVOT represent?
Answer: Stroke distance (distance blood travels per beat)
LVOT VTI represents the stroke distance — the column of blood ejected per heartbeat — and when multiplied by LVOT CSA gives stroke volume.
Tissue Doppler imaging (TDI) measures velocities of which structure?
Answer: Myocardium and cardiac walls
TDI uses low-gain, high-pass filtering to measure myocardial wall velocities rather than blood flow velocities.
Which color flow Doppler finding is characteristic of mitral regurgitation?
Answer: Systolic mosaic jet from LV into LA
Mitral regurgitation appears as a systolic color flow jet directed from the LV back into the left atrium.