ARDMS SPI MCQ 5

Question 1

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

Accepted Answer

Their strong non-linear oscillation and backscatter at diagnostic pressures

Answer

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

Question 2

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

Accepted Answer

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

Answer

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

Question 3

In a spectral Doppler waveform, spectral broadening refers to:

Accepted Answer

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

Answer

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.

Question 4

The ALARA principle in diagnostic ultrasound instructs operators to:

Accepted Answer

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

Answer

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

Question 5

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

Accepted Answer

Lower frequency provides greater depth penetration

Answer

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

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI MCQ 5