ARDMS SPI MCQ 2

Question 1

Which effect describes the heating of tissue caused by the absorption of ultrasound energy?

Accepted Answer

Thermal bioeffect

Answer

Thermal bioeffects occur when absorbed ultrasound energy is converted to heat within tissue.

Question 2

What does a higher Q-factor in a transducer indicate?

Accepted Answer

Narrower bandwidth and longer pulse duration

Answer

A high Q-factor transducer has a narrow bandwidth and produces a longer, less damped pulse.

Question 3

In pulsed wave Doppler, aliasing occurs when the Doppler shift frequency exceeds:

Accepted Answer

One-half the pulse repetition frequency (Nyquist limit)

Answer

Aliasing occurs when the detected Doppler shift exceeds the Nyquist limit, which is half the PRF.

Question 4

Which artifact appears as multiple equally spaced reflectors beyond a highly reflective structure?

Accepted Answer

Reverberation

Answer

Reverberation artifact creates multiple equally spaced echoes as sound bounces repeatedly between two reflectors.

Question 5

The speed of sound in soft tissue is approximately:

Accepted Answer

1540 m/s

Answer

The assumed speed of sound in soft tissue used by diagnostic ultrasound systems is approximately 1540 m/s.

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test