SPI Edelman Exam (Comprehensive Exam) with
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verified solutions !Z
sound waves are: - ✔✔longitudinal and mechanical
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The speed of US in soft tissue is closest to: - ✔✔1,500 m/s
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the frequency closest to the lower limit of ultrasound is: - ✔✔15,000Hz
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which is not an acoustic variable? - ✔✔intensity
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the effects of soft tissue on US are called: - ✔✔acoustic propagation
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properties
all the following are true EXCEPT - ✔✔two waves with identical
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frequencies must interfere constructively !Z !Z !Z
put in decreasing order: deca, deci, micro, centi - ✔✔deca, deci, centi,
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& micro
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______ is the time to complete one cycle. - ✔✔period
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which of the following sound waves is ultrasonic and least useful in
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diagnostic imaging? - ✔✔30 KHz !Z !Z !Z !Z
what is the frequency of a wave with 1 msec period? - ✔✔1 kHz
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,______ is the distance covered by one cycle. - ✔✔wavelength
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which of the following is determined by the source and the medium? -
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✔✔range resolution !Z
propagation speed = ______ x wavelength - ✔✔frequency
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as a result of ______ the propagation speed increases. - ✔✔decreasing
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compressibility and decreasing density !Z !Z !Z
put in decreasing order of propagation speed: gas, liquid, solid -
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✔✔solid, liquid, gas !Z !Z
in the same medium, if the frequency of US is increased from 0.77MHz
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Zto 1.54 MHz, what happens to the wavelength? - ✔✔halved
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a sound wave's frequency is 10 MHz. the wave is traveling in soft
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tissue. what is its wavelength? - ✔✔0.15 mm
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if the frequency of an US wave is doubled, what happens to the
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period? - ✔✔halved !Z !Z
if the frequency of US is increased from 0.77 MHz to 1.54 MHz, what
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happens to the propagation speed? - ✔✔remains the same
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the units of pulse repetition frequency are - ✔✔per minute
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the time from the beginning of a pulse until its end is _____? - ✔✔pulse
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duration
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, what happens to the speed of sound in a medium when the bulk
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modulus of the medium increases? - ✔✔faster
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______ resolution is determined by the spatial pulse length. - ✔✔radial &
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axial
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if a wave's amplitude is doubled, what happens to the power? -
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✔✔quadrupled
power of sound has units of - ✔✔watts
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if the intensity of a sound beam remains unchanged while the beam
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area is reduced in half, what has happened to the power? - ✔✔halved
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which of these intensities is smallest? SATP, SPTP, SATA - ✔✔SATA
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the duty factor for continuous wave ultrasound is - ✔✔1.0
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what is the minimum value of the duty factor? - ✔✔0.0%
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what are the units of intensity? - ✔✔watts/cm squared
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what happens to the speed of sound in a medium when the bulk
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modulus of the medium decreases? - ✔✔slower
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the units of attenuation are _____; this is a ______ scale. - ✔✔dB,
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logarithmic
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verified solutions !Z
sound waves are: - ✔✔longitudinal and mechanical
!Z !Z !Z !Z !Z !Z
The speed of US in soft tissue is closest to: - ✔✔1,500 m/s
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
the frequency closest to the lower limit of ultrasound is: - ✔✔15,000Hz
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
which is not an acoustic variable? - ✔✔intensity
!Z !Z !Z !Z !Z !Z !Z
the effects of soft tissue on US are called: - ✔✔acoustic propagation
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
properties
all the following are true EXCEPT - ✔✔two waves with identical
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
frequencies must interfere constructively !Z !Z !Z
put in decreasing order: deca, deci, micro, centi - ✔✔deca, deci, centi,
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
& micro
!Z
______ is the time to complete one cycle. - ✔✔period
!Z !Z !Z !Z !Z !Z !Z !Z !Z
which of the following sound waves is ultrasonic and least useful in
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
diagnostic imaging? - ✔✔30 KHz !Z !Z !Z !Z
what is the frequency of a wave with 1 msec period? - ✔✔1 kHz
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
,______ is the distance covered by one cycle. - ✔✔wavelength
!Z !Z !Z !Z !Z !Z !Z !Z !Z
which of the following is determined by the source and the medium? -
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
✔✔range resolution !Z
propagation speed = ______ x wavelength - ✔✔frequency
!Z !Z !Z !Z !Z !Z !Z
as a result of ______ the propagation speed increases. - ✔✔decreasing
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
compressibility and decreasing density !Z !Z !Z
put in decreasing order of propagation speed: gas, liquid, solid -
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
✔✔solid, liquid, gas !Z !Z
in the same medium, if the frequency of US is increased from 0.77MHz
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Zto 1.54 MHz, what happens to the wavelength? - ✔✔halved
!Z !Z !Z !Z !Z !Z !Z !Z !Z
a sound wave's frequency is 10 MHz. the wave is traveling in soft
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
tissue. what is its wavelength? - ✔✔0.15 mm
!Z !Z !Z !Z !Z !Z !Z
if the frequency of an US wave is doubled, what happens to the
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
period? - ✔✔halved !Z !Z
if the frequency of US is increased from 0.77 MHz to 1.54 MHz, what
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
happens to the propagation speed? - ✔✔remains the same
!Z !Z !Z !Z !Z !Z !Z !Z
the units of pulse repetition frequency are - ✔✔per minute
!Z !Z !Z !Z !Z !Z !Z !Z !Z
the time from the beginning of a pulse until its end is _____? - ✔✔pulse
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
duration
!Z
, what happens to the speed of sound in a medium when the bulk
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
modulus of the medium increases? - ✔✔faster
!Z !Z !Z !Z !Z !Z
______ resolution is determined by the spatial pulse length. - ✔✔radial &
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
axial
!Z
if a wave's amplitude is doubled, what happens to the power? -
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
✔✔quadrupled
power of sound has units of - ✔✔watts
!Z !Z !Z !Z !Z !Z !Z
if the intensity of a sound beam remains unchanged while the beam
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
area is reduced in half, what has happened to the power? - ✔✔halved
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
which of these intensities is smallest? SATP, SPTP, SATA - ✔✔SATA
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
the duty factor for continuous wave ultrasound is - ✔✔1.0
!Z !Z !Z !Z !Z !Z !Z !Z !Z
what is the minimum value of the duty factor? - ✔✔0.0%
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
what are the units of intensity? - ✔✔watts/cm squared
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what happens to the speed of sound in a medium when the bulk
!Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z !Z
modulus of the medium decreases? - ✔✔slower
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the units of attenuation are _____; this is a ______ scale. - ✔✔dB,
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logarithmic
