Free RDCS Practice Questions
Original questions with explanations
These original RDCS practice questions are educational examples designed to exercise reasoning. They are not recalled exam items and do not imply access to live or confidential test content.
Question 1
A spectral Doppler display shows aliasing because the velocity exceeds the Nyquist limit. Which adjustment is most likely to correct it?
- A. Lower the pulse-repetition frequency
- B. Increase the velocity scale
- C. Increase persistence
- D. Decrease wall filter
Answer and explanation
B. Increase the velocity scale Increasing the pulse-repetition frequency or velocity scale raises the Nyquist limit and can remove spectral aliasing.
Question 2
Using the simplified Bernoulli equation, what pressure gradient corresponds to a peak velocity of 4 m/s?
- A. 16 mmHg
- B. 32 mmHg
- C. 64 mmHg
- D. 80 mmHg
Answer and explanation
C. 64 mmHg The simplified Bernoulli equation is ΔP = 4v². With v = 4 m/s, 4 × 16 = 64 mmHg.
Question 3
Which echocardiographic view displays all four cardiac chambers simultaneously?
- A. Parasternal long-axis
- B. Parasternal short-axis at the aortic valve
- C. Apical four-chamber
- D. Suprasternal notch
Answer and explanation
C. Apical four-chamber The apical four-chamber view is designed to display both atria and both ventricles in one imaging plane.
Question 4
Why should Doppler measurements be aligned as parallel as possible to blood flow?
- A. To increase image depth
- B. To minimize angle-related velocity error
- C. To eliminate all spectral broadening
- D. To increase frame rate
Answer and explanation
B. To minimize angle-related velocity error Doppler velocity calculations depend on the cosine of the insonation angle. Poor alignment increasingly underestimates velocity.
Question 5
Which action best supports reproducible ventricular measurements?
- A. Use a different view for every follow-up
- B. Measure at a consistent cardiac phase and recommended view
- C. Change gain until the chamber appears smallest
- D. Exclude prior measurements from review
Answer and explanation
B. Measure at a consistent cardiac phase and recommended view Consistent views, timing, and measurement conventions reduce avoidable variability between studies.
How to Review Your Results
For every missed item, name the tested concept, explain why the correct option is best, and identify the clue that rules out each distractor. Then review the corresponding official content domain.