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.
Read the first 7 MCQ flashcards as text
Which effect describes the heating of tissue caused by the absorption of ultrasound energy?
Answer: Thermal bioeffect
Thermal bioeffects occur when absorbed ultrasound energy is converted to heat within tissue.
What does a higher Q-factor in a transducer indicate?
Answer: Narrower bandwidth and longer pulse duration
A high Q-factor transducer has a narrow bandwidth and produces a longer, less damped pulse.
In pulsed wave Doppler, aliasing occurs when the Doppler shift frequency exceeds:
Answer: One-half the pulse repetition frequency (Nyquist limit)
Aliasing occurs when the detected Doppler shift exceeds the Nyquist limit, which is half the PRF.
Which artifact appears as multiple equally spaced reflectors beyond a highly reflective structure?
Answer: Reverberation
Reverberation artifact creates multiple equally spaced echoes as sound bounces repeatedly between two reflectors.
The speed of sound in soft tissue is approximately:
Answer: 1540 m/s
The assumed speed of sound in soft tissue used by diagnostic ultrasound systems is approximately 1540 m/s.
What is the primary advantage of spatial compounding in ultrasound imaging?
Answer: Reduced speckle and improved contrast resolution
Spatial compounding averages images acquired from multiple steering angles, reducing speckle and improving contrast resolution.
Which transducer type uses a rotating or wobbling mechanical element to sweep the beam?
Answer: Mechanical transducer
Mechanical transducers use a physically moving element to sweep the ultrasound beam across the imaging plane.