SPI Exam Review 2025 With Correct
Answers
Sound waves are:
d d d
a) electric
d d
b) mechanical, transverse
d d d
c) spectral
d d
d) longitudinal, mechanical - correct answer D
d d d d d d
The speed of sound of ultrasound in soft tissue is closest to:
d d d d d d d d d d d d
a) 1,540 km/sec
d d
b) 1.54 km/sec
d d
c) 1,500 m/s
d d d
d) 1,540 mm/sec - correct answer C
d d d d d d
Which is not an acoustic variable?
d d d d d d
a) density
d d
b) pressure
d d
c) distance
d d
d) intensity - correct answer D
d d d d d
,The effects of soft tissue on ultrasound are called:
d d d d d d d d d
a) acoustic proliferation properties
d d d d
b) dynamic effects
d d d
c) acoustic propagation properties
d d d d
d) biological effects - correct answer C
d d d d d d
All of the following are true EXCEPT:
d d d d d d d
a) two waves with identical frequencies must interfere constructively.
d d d d d d d d
b) constructive interference is associated with waves that are in-phase.
d d d d d d d d d d
c) out-of-phase waves interfere destructively.
d d d d d
d) waves of different frequencies may exhibit both constructive and destructive interference at different
d d d d d d d d d d d d d d
times. - correct answer A d d d d
Put in decreasing order:
d d d d
a) deca
d d
b) deci
d d
c) micro
d d
d) centi - correct answer abdc
d d d d d
______ is the time to complete one cycle d d d d d d d d
a) pulse duration
d d d
b) pulse period
d d d
c) period
d d
d) duration period - correct answer C
d d d d d d
Which of the following sound waves is ultrasonic and least useful in diagnostic imaging?
d d d d d d d d d d d d d d
a) 30 KHz
d d d
b) 8 Mhz
d d d
,c) 8,000 Hz
d d d
d) 3,000 Hz
d d d
e) 15 Hz - correct answer A
d d d d d d
______ is the distance covered by one cycle. d d d d d d d d
a) pulse length
d d d
b) wavelength
d d
c) cycle distance
d d d
d) cycle duration - correct answer B
d d d d d d
Which of the following is determined by the source and the medium?
d d d d d d d d d d d d
a) frequency
d d
b) period
d
c) propagation speed
d d d
d) range resolution - correct answer D
d d d d d d
Propagation speed = _______ x wavelength d d d d d d
a) pulse duration
d d d
b) period
d d
c) # of cycles in the pulse
d d d d d d d
d) frequency - correct answer D
d d d d d
As a result of _____ the propagation speed increases.
d d d d d d d d d
a) increasing stiffness and increasing density
d d d d d d
b) increasing stiffness and increasing elasticity
d d d d d d
c) decreasing compressibility and decreasing density
d d d d d d
d) decreasing stiffness and decreasing density. - correct answer C
d d d d d d d d d
Put in decreasing order of propagation speed.
d d d d d d d
, a) gas d d
b) liquidd d
c) solid - correct answer c b a
d d d d d d d
If the frequency of an ultrasound wave is doubled, what happens to the period?
d d d d d d d d d d d d d d
a) doubles
d d
b) halvedd d
c) remains the same
d d d d
d) 4x greater - correct answer B
d d d d d d
The units of pulse repetition frequency are:
d d d d d d d
a) per minute
d d d
b) microseconds
d
c) mm/microseconds
d
d) MHz - correct answer A
d d d d d
The time from the beginning of the pulse to the end of that pulse is _______?
d d d d d d d d d d d d d d d d
a) periodd d
b) pulse duration
d d d
c) pulse length
d d d
d) PRF - correct answer B
d d d d d
What happens to the speed of sound in a medium when the bulk modulus increases?
d d d d d d d d d d d d d d d
a) fasterd d
b) slowerd d
c) unchanged - correct answer A
d d d d d
_________ resolution is determined by the spatial pulse length d d d d d d d d
a) radiald d
Answers
Sound waves are:
d d d
a) electric
d d
b) mechanical, transverse
d d d
c) spectral
d d
d) longitudinal, mechanical - correct answer D
d d d d d d
The speed of sound of ultrasound in soft tissue is closest to:
d d d d d d d d d d d d
a) 1,540 km/sec
d d
b) 1.54 km/sec
d d
c) 1,500 m/s
d d d
d) 1,540 mm/sec - correct answer C
d d d d d d
Which is not an acoustic variable?
d d d d d d
a) density
d d
b) pressure
d d
c) distance
d d
d) intensity - correct answer D
d d d d d
,The effects of soft tissue on ultrasound are called:
d d d d d d d d d
a) acoustic proliferation properties
d d d d
b) dynamic effects
d d d
c) acoustic propagation properties
d d d d
d) biological effects - correct answer C
d d d d d d
All of the following are true EXCEPT:
d d d d d d d
a) two waves with identical frequencies must interfere constructively.
d d d d d d d d
b) constructive interference is associated with waves that are in-phase.
d d d d d d d d d d
c) out-of-phase waves interfere destructively.
d d d d d
d) waves of different frequencies may exhibit both constructive and destructive interference at different
d d d d d d d d d d d d d d
times. - correct answer A d d d d
Put in decreasing order:
d d d d
a) deca
d d
b) deci
d d
c) micro
d d
d) centi - correct answer abdc
d d d d d
______ is the time to complete one cycle d d d d d d d d
a) pulse duration
d d d
b) pulse period
d d d
c) period
d d
d) duration period - correct answer C
d d d d d d
Which of the following sound waves is ultrasonic and least useful in diagnostic imaging?
d d d d d d d d d d d d d d
a) 30 KHz
d d d
b) 8 Mhz
d d d
,c) 8,000 Hz
d d d
d) 3,000 Hz
d d d
e) 15 Hz - correct answer A
d d d d d d
______ is the distance covered by one cycle. d d d d d d d d
a) pulse length
d d d
b) wavelength
d d
c) cycle distance
d d d
d) cycle duration - correct answer B
d d d d d d
Which of the following is determined by the source and the medium?
d d d d d d d d d d d d
a) frequency
d d
b) period
d
c) propagation speed
d d d
d) range resolution - correct answer D
d d d d d d
Propagation speed = _______ x wavelength d d d d d d
a) pulse duration
d d d
b) period
d d
c) # of cycles in the pulse
d d d d d d d
d) frequency - correct answer D
d d d d d
As a result of _____ the propagation speed increases.
d d d d d d d d d
a) increasing stiffness and increasing density
d d d d d d
b) increasing stiffness and increasing elasticity
d d d d d d
c) decreasing compressibility and decreasing density
d d d d d d
d) decreasing stiffness and decreasing density. - correct answer C
d d d d d d d d d
Put in decreasing order of propagation speed.
d d d d d d d
, a) gas d d
b) liquidd d
c) solid - correct answer c b a
d d d d d d d
If the frequency of an ultrasound wave is doubled, what happens to the period?
d d d d d d d d d d d d d d
a) doubles
d d
b) halvedd d
c) remains the same
d d d d
d) 4x greater - correct answer B
d d d d d d
The units of pulse repetition frequency are:
d d d d d d d
a) per minute
d d d
b) microseconds
d
c) mm/microseconds
d
d) MHz - correct answer A
d d d d d
The time from the beginning of the pulse to the end of that pulse is _______?
d d d d d d d d d d d d d d d d
a) periodd d
b) pulse duration
d d d
c) pulse length
d d d
d) PRF - correct answer B
d d d d d
What happens to the speed of sound in a medium when the bulk modulus increases?
d d d d d d d d d d d d d d d
a) fasterd d
b) slowerd d
c) unchanged - correct answer A
d d d d d
_________ resolution is determined by the spatial pulse length d d d d d d d d
a) radiald d
