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