SPI Review - Edelman Questions and Answers
(100% Correct Answers) Already Graded A+
Which of the following choices best describes an ideal
epidemiologic bioeffects study? [ Ans: ] Randomized and
prospective
Sound waves are? [ Ans: ] Longitudinal, mechanical
The speed of US in soft tissue is closest to? [ Ans: ]
1,500m/s
The frequency closest to the lower limit of US is? [ Ans: ]
15,000Hz
Which is not an acoustic variable? [ Ans: ] Intensity
The effects of soft tissue on US are called? [ Ans: ]
Acoustic propagation properties
All of the following are true EXCEPT? [ Ans: ] Two waves
with identical frequencies must interfere constructively
Put in decreasing order [ Ans: ] Deca/Deci/Centi/Micro
________ is the time to complete one cycle [ Ans: ] Period
Which of the following sound waves is ultrasonic and least
useful in diagnostic imaging? [ Ans: ] 30KHz
,What is the frequency of a wave with 1msec period? [ Ans:
] 1kHz
________ is the distance covered by one cycle [ Ans: ]
Wavelength
Which of the following is determined by the source and
the medium? [ Ans: ] Range resolution
Propagation speed=_______ x wavelength [ Ans: ]
Frequency
As a result of _______ the propagation speed increases [
Ans: ] Decreasing compressibility and decreasing density
Put in decreasing order of propagation speed [ Ans: ]
Solid/Liquid/Gas
If the frequency of US is increased from 0.77MHz to
1.54MHz, what happens to the wavelength? [ Ans: ] Halved
A sound wave's frequency is 10MHz. The wave is traveling
in soft tissue. What is its wavelength? [ Ans: ] 0.15mm
If the frequency of an US wave is doubled, what happens
to the period? [ Ans: ] Halved
If the frequency of US is increased from 0.77MHz to
1.54MHz, what happens to the propagation speed? [ Ans: ]
Remains the same
, The units of pulse repetition frequency are? [ Ans: ] Per
minute
The time from the beginning of a pulse until its end is? [
Ans: ] Pulse duration
What happens to the speed of sound in a medium when
the bulk modulus of the medium increases? [ Ans: ] Faster
________ resolution is determined by the spatial pulse
length [ Ans: ] Radial or Axial
If a wave's amplitude is doubled, what happens to the
power? [ Ans: ] Quadrupled
Power of sound has units of? [ Ans: ] Watts
If the intensity of a sound beam remains unchanged while
the beam area is reduced in half, what has happened to
the power? [ Ans: ] Halved
Which of these intensities is smallest? [ Ans: ] SPTP
The duty factor for continuous wave ultrasound is? [ Ans:
] 1.0
What is the minimum value of the duty factor? [ Ans: ]
0.0%
What are the units of intensity? [ Ans: ] Watts/cm squared
(100% Correct Answers) Already Graded A+
Which of the following choices best describes an ideal
epidemiologic bioeffects study? [ Ans: ] Randomized and
prospective
Sound waves are? [ Ans: ] Longitudinal, mechanical
The speed of US in soft tissue is closest to? [ Ans: ]
1,500m/s
The frequency closest to the lower limit of US is? [ Ans: ]
15,000Hz
Which is not an acoustic variable? [ Ans: ] Intensity
The effects of soft tissue on US are called? [ Ans: ]
Acoustic propagation properties
All of the following are true EXCEPT? [ Ans: ] Two waves
with identical frequencies must interfere constructively
Put in decreasing order [ Ans: ] Deca/Deci/Centi/Micro
________ is the time to complete one cycle [ Ans: ] Period
Which of the following sound waves is ultrasonic and least
useful in diagnostic imaging? [ Ans: ] 30KHz
,What is the frequency of a wave with 1msec period? [ Ans:
] 1kHz
________ is the distance covered by one cycle [ Ans: ]
Wavelength
Which of the following is determined by the source and
the medium? [ Ans: ] Range resolution
Propagation speed=_______ x wavelength [ Ans: ]
Frequency
As a result of _______ the propagation speed increases [
Ans: ] Decreasing compressibility and decreasing density
Put in decreasing order of propagation speed [ Ans: ]
Solid/Liquid/Gas
If the frequency of US is increased from 0.77MHz to
1.54MHz, what happens to the wavelength? [ Ans: ] Halved
A sound wave's frequency is 10MHz. The wave is traveling
in soft tissue. What is its wavelength? [ Ans: ] 0.15mm
If the frequency of an US wave is doubled, what happens
to the period? [ Ans: ] Halved
If the frequency of US is increased from 0.77MHz to
1.54MHz, what happens to the propagation speed? [ Ans: ]
Remains the same
, The units of pulse repetition frequency are? [ Ans: ] Per
minute
The time from the beginning of a pulse until its end is? [
Ans: ] Pulse duration
What happens to the speed of sound in a medium when
the bulk modulus of the medium increases? [ Ans: ] Faster
________ resolution is determined by the spatial pulse
length [ Ans: ] Radial or Axial
If a wave's amplitude is doubled, what happens to the
power? [ Ans: ] Quadrupled
Power of sound has units of? [ Ans: ] Watts
If the intensity of a sound beam remains unchanged while
the beam area is reduced in half, what has happened to
the power? [ Ans: ] Halved
Which of these intensities is smallest? [ Ans: ] SPTP
The duty factor for continuous wave ultrasound is? [ Ans:
] 1.0
What is the minimum value of the duty factor? [ Ans: ]
0.0%
What are the units of intensity? [ Ans: ] Watts/cm squared
