Practice Test GeeksARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test
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MCQ Flashcards

7 cards from real ARDMS SPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which property of ultrasound contrast agents (microbubbles) makes them effective Doppler signal enhancers?

    Answer: Their strong non-linear oscillation and backscatter at diagnostic pressures

    Microbubbles oscillate non-linearly under ultrasound pressure, producing strong harmonic backscatter that greatly enhances Doppler signals.

  2. What does the term 'dynamic range' refer to in ultrasound imaging?

    Answer: The ratio of the largest to smallest signal amplitudes the system can process

    Dynamic range is the ratio (in dB) between the maximum and minimum signal amplitudes that the system can detect and display.

  3. In a spectral Doppler waveform, spectral broadening refers to:

    Answer: Widening of the frequency band representing a range of flow velocities within the sample volume

    Spectral broadening occurs when multiple velocities are present in the sample volume, widening the spectral window and filling in the clear area beneath the waveform envelope.

  4. The ALARA principle in diagnostic ultrasound instructs operators to:

    Answer: Keep acoustic output as low as reasonably achievable while obtaining diagnostic information

    ALARA (As Low As Reasonably Achievable) requires using the minimum acoustic output necessary to obtain clinically useful images.

  5. Which of the following correctly describes the relationship between frequency and penetration depth in ultrasound?

    Answer: Lower frequency provides greater depth penetration

    Lower frequency ultrasound attenuates less per centimeter of tissue, allowing greater penetration depth at the cost of reduced resolution.

  6. Acoustic shadowing posterior to a gallstone occurs because the stone:

    Answer: Reflects and absorbs most of the incident ultrasound, leaving reduced energy beyond it

    Gallstones strongly reflect and absorb ultrasound, resulting in little energy passing through to generate echoes posterior to the stone.

  7. In continuous wave (CW) Doppler, which limitation is NOT present in pulsed wave Doppler?

    Answer: Range ambiguity (cannot localize signal depth)

    CW Doppler uses simultaneous transmit and receive crystals and cannot determine the depth of origin of Doppler signals, causing range ambiguity.