Free ARDMS SPI Practice Questions
Original questions with explanations
These original ARDMS SPI 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
What happens to wavelength when frequency increases and propagation speed remains constant?
- A. Wavelength increases
- B. Wavelength decreases
- C. Wavelength is unchanged
- D. Amplitude doubles
Answer and explanation
B. Wavelength decreases Wavelength equals propagation speed divided by frequency, so it decreases as frequency rises.
Question 2
Which adjustment most directly improves axial resolution?
- A. Use a shorter spatial pulse length
- B. Increase beam width
- C. Increase frame averaging
- D. Reduce damping
Answer and explanation
A. Use a shorter spatial pulse length A shorter spatial pulse length allows reflectors closer together along the beam axis to be distinguished.
Question 3
Aliasing in pulsed-wave Doppler is most directly related to which limit?
- A. Nyquist limit
- B. Acoustic impedance
- C. Duty factor
- D. Huygens principle
Answer and explanation
A. Nyquist limit Aliasing occurs when the Doppler shift exceeds the Nyquist limit for the selected pulse repetition frequency.
Question 4
Which principle supports minimizing acoustic exposure while obtaining diagnostic information?
- A. ALARA
- B. Snell’s law only
- C. Maximum output at all times
- D. Eliminate quality assurance
Answer and explanation
A. ALARA ALARA calls for acoustic output and exposure time to remain as low as reasonably achievable.
Question 5
A candidate misses questions about artifacts. What is the best remediation?
- A. Memorize artifact names only
- B. Connect each artifact to its physical cause and corrective control
- C. Avoid image examples
- D. Study only patient positioning
Answer and explanation
B. Connect each artifact to its physical cause and corrective control Understanding cause and correction supports transfer to unfamiliar exam scenarios.
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.