Ultrasound Physics (DMS 206) Questions With Complete
Solutions
10^-1 Correct Answers Deci
d
tenth
10^-2 Correct Answers Centi
c
Hundredth
10^-3 Correct Answers Milli
m
Thousandth
10^-6 Correct Answers Micro
u
Millionth
10^-9 Correct Answers nano
n
Billionth
10^1 Correct Answers Deca
da
Ten
10^2 Correct Answers Hecto
h
Hundred
,10^3 Correct Answers Kilo
k
Thousand
10^6 Correct Answers Mega
M
Million
10^9 Correct Answers Giga
G
Billion
Absorption Correct Answers When sound wave is converted
into another energy, such as heat
Directly related to frequency
bone = extensive absorption
acoustic insulator Correct Answers thin barrier of cork or
rubber that isolates or uncouples the internal components of the
transducer
Acoustic parameters are used to describe the features of sound
waves. Correct Answers True
Acoustic parameters Correct Answers Period, frequency,
amplitude, power, intensity, wavelength, propagation speed
Acoustic propagation properties Correct Answers The effects of
the medium upon the sound wave
,Acoustic variables allow us to determine which waves are sound
waves and which are not. Correct Answers True
Acoustic variables Correct Answers Pressure: concentration of
force in an area (pascals, Pa)
Density: concentration of mass in a volume (kg/cm^3)
Distance: measure of particle motion (cm, ft, mile)
aliasing Correct Answers less: slower blood velocity, lower
frequency transducer, shallow gate, high PRF
More: faster blood velocity, higher frequency transducer, deep
gate (low PRF
amplification Correct Answers also called receiver gain
does not improve signal to noise ratio
dB
Amplitude Correct Answers "Bigness"
Difference between the minimum value and the average value of
the acoustic variable
Pascals - pressure
g/cm^3 - density
cm - particle motion
in - any distance
dB
Initially determined by the sound source, however decreases as
sound propagates
Yes, adjustable
amplitude mode Correct Answers a-mode
, upward spikes
x = depth
y= amp
analog Correct Answers real world, unlimited choices,
continuous values
image fade, flicker, instability, deterioration
anechoic Correct Answers echo-free
Angle of incidence Correct Answers = angle of reflection
Annular phased arrays Correct Answers disc like, multiple ring
shaped (bulls eye)
mechanical steering, 2-D image
multiple transmit focal zones
shallow beam focus (thin PZT)
Sector / fan shaped
apodization Correct Answers firing strength very element to
element
inner crystals stronger the weaker outer
Attenuation coefficient Correct Answers 2 dB/cm
Constant regardless of distance
multiple attenuation coefficient by distance traveled
directly related to frequency (is 1/2)
Attenuation Correct Answers The decrease in intensity, power,
and amplitude as sound travels
-Path length
Solutions
10^-1 Correct Answers Deci
d
tenth
10^-2 Correct Answers Centi
c
Hundredth
10^-3 Correct Answers Milli
m
Thousandth
10^-6 Correct Answers Micro
u
Millionth
10^-9 Correct Answers nano
n
Billionth
10^1 Correct Answers Deca
da
Ten
10^2 Correct Answers Hecto
h
Hundred
,10^3 Correct Answers Kilo
k
Thousand
10^6 Correct Answers Mega
M
Million
10^9 Correct Answers Giga
G
Billion
Absorption Correct Answers When sound wave is converted
into another energy, such as heat
Directly related to frequency
bone = extensive absorption
acoustic insulator Correct Answers thin barrier of cork or
rubber that isolates or uncouples the internal components of the
transducer
Acoustic parameters are used to describe the features of sound
waves. Correct Answers True
Acoustic parameters Correct Answers Period, frequency,
amplitude, power, intensity, wavelength, propagation speed
Acoustic propagation properties Correct Answers The effects of
the medium upon the sound wave
,Acoustic variables allow us to determine which waves are sound
waves and which are not. Correct Answers True
Acoustic variables Correct Answers Pressure: concentration of
force in an area (pascals, Pa)
Density: concentration of mass in a volume (kg/cm^3)
Distance: measure of particle motion (cm, ft, mile)
aliasing Correct Answers less: slower blood velocity, lower
frequency transducer, shallow gate, high PRF
More: faster blood velocity, higher frequency transducer, deep
gate (low PRF
amplification Correct Answers also called receiver gain
does not improve signal to noise ratio
dB
Amplitude Correct Answers "Bigness"
Difference between the minimum value and the average value of
the acoustic variable
Pascals - pressure
g/cm^3 - density
cm - particle motion
in - any distance
dB
Initially determined by the sound source, however decreases as
sound propagates
Yes, adjustable
amplitude mode Correct Answers a-mode
, upward spikes
x = depth
y= amp
analog Correct Answers real world, unlimited choices,
continuous values
image fade, flicker, instability, deterioration
anechoic Correct Answers echo-free
Angle of incidence Correct Answers = angle of reflection
Annular phased arrays Correct Answers disc like, multiple ring
shaped (bulls eye)
mechanical steering, 2-D image
multiple transmit focal zones
shallow beam focus (thin PZT)
Sector / fan shaped
apodization Correct Answers firing strength very element to
element
inner crystals stronger the weaker outer
Attenuation coefficient Correct Answers 2 dB/cm
Constant regardless of distance
multiple attenuation coefficient by distance traveled
directly related to frequency (is 1/2)
Attenuation Correct Answers The decrease in intensity, power,
and amplitude as sound travels
-Path length
