Free RDMS Practice Questions
Original questions with explanations
These original RDMS 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 fluid-filled structure produces increased echoes deep to it. What artifact is being demonstrated?
- A. Posterior acoustic enhancement
- B. Mirror image
- C. Reverberation
- D. Edge shadowing
Answer and explanation
A. Posterior acoustic enhancement Fluid attenuates sound less than surrounding tissue, so echoes distal to the structure appear brighter.
Question 2
A calcified structure blocks sound and creates a dark region behind it. What is this called?
- A. Enhancement
- B. Acoustic shadowing
- C. Refraction
- D. Side-lobe artifact
Answer and explanation
B. Acoustic shadowing Strong attenuation or reflection prevents sound from reaching deeper tissues, producing posterior acoustic shadowing.
Question 3
Which principle directs the sonographer to use the lowest output and shortest exposure needed for diagnostic information?
- A. ALARA
- B. Bernoulli
- C. Snell’s law
- D. Poiseuille’s law
Answer and explanation
A. ALARA ALARA means keeping acoustic exposure as low as reasonably achievable while still obtaining diagnostic information.
Question 4
For angle-corrected vascular Doppler measurements, why is an angle of 60 degrees or less commonly preferred?
- A. It eliminates attenuation
- B. It limits rapidly increasing angle-related velocity error
- C. It prevents aliasing in every case
- D. It doubles the pulse-repetition frequency
Answer and explanation
B. It limits rapidly increasing angle-related velocity error Velocity error increases rapidly at larger Doppler angles, making accurate alignment and an angle no greater than about 60 degrees important.
Question 5
Which control primarily changes the brightness of returning echoes throughout the image?
- A. Overall gain
- B. Depth
- C. Focal position
- D. Sweep speed
Answer and explanation
A. Overall gain Overall gain amplifies received echo signals and changes their displayed brightness throughout the image.
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.