Final Part 3 Flashcards
What is the elimination of
voltages that do not exceed a
certain level?
a. amplification
b. decompensation
c. reject
d. demodulation
c. reject
What is the Fraunhofer?
a. focus
b. nearzone
c. far zone
.d penetration depth
c. far zone
What are the units of lateral resolution
a. Hertz
b. Rayls
c. m/s
d. feet
d. feet
Which of the following is the
best lateral resolution?
a. 15 mm
b. 6m
c. 0.06 cm
d. 2 c m
c. 0.06 cm
If the spatial pulse length is 10 mm, what is axial resolution
a. 0.5 cm
b. 5 cm
c. 10 mm
d. 1cm
a. 0.5 cm
If the frequency is decreased
the numerical value of the
radial resolution is
a. increased
b. decreased
c. unchanged
a. increased
A transducer —— one form——
to other.
Converts, energy
Which of these boudaries will
create the strongest reflection?
a. air-lung
b. -air-soft tissue
c. air-blood
d. soft tissue-blood
b. -air-soft tissue
d. soft tissue-blood
Which of these boudaries wil create the strongest reflection?
a. air-lung
b. air-soft tissue
c. air-blood
d. soft tissue-blood
b. air-soft tissue
d. soft tissue-blood
Identify one of the advantages
of coded excitation.
a. penetration
b. improved lateral resolution
c. improved temporal resolution
d. shorter pulse repetition period
penetration
What is the meaning of a thermal index = 3?
a. tissue temperature may rise 3 degrees Farenheit
b. tissue temperature will rise 3degree Celsius
c. tissue temperature may rise 3 degrees Celsius
d. microbubbles 3mm in diameter will burst
c. tissue temperature may rise 3 degrees Celsius
The creation of an image by scanning from different angles best describes
.a spatial compounding
b. fil-ininterpolation
c. Phase quadature
d. persistance
.a spatial compounding
you enter a room only to find the patient does not speak English. Which of the following you do first?
a call for a hospital
interpreter
b. use sign language
c.obtain itfromabilingual family member who is ni
the room
d. point ot the signature line
of the consent form and
have hte patient sign ti
a call for a hospital
interpreter
You enter a hospital room to perform an ultrasound exam. Which of the following should you do first?
d. check the patient identification
Which of the following has the greatest output intensity?
a. b-mode
b. gray scale imaging
c. CW doppler
d. pulsed Doppler
d. pulsed Doppler
Where does coded excitation originate?
a. the demodulator
b. the flux capacitor
c. the transducer
d. the pulser
d. the pulser
Al of the following are true of
normal cavitation EXCEPT:
a. harmful bioeffects are commonly observed
b. it is also known as inertial cavitation
.c only a 10% increase in pressure is needed to convert to this from stable cavitation
d. temperatures ni the thousands of degrees are c r e a t e d
.e it si consistent with shock w a v e s
a. harmful bioeffects are commonly observed
identify one of the advantages of coded excitation.
a. improved contrast resolution
b. improved lateral resolution
c. improved temporal
resolution
d. shorter pulse repetition period
a. improved contrast resolution
The consolidation of many images into a single frame best describes which of the following?
a. dynamic range
b. fill-in interpolation
c. phase quadrature
d. persistence
d. persistence
The interaction of microscopic bubbles and ultrasound form the basis for cavitation
bioeffects. Which of the
following forms of cavitation
are most likely to produce microstreaming in the intracellular fluid and s h e a r stresses?
a. stable cavitation
b. normal cavitation c. transient cavitation d. inertial cavitation
e, active cavitation
a. stable cavitation
Which of the following best describes the empirical approach to the study of bioeffects?
a. exposure-response
b. cause-effect
c. risk-benefit
d. causation-reaction
e .effect-microstreaming
a. exposure-response
Which of the following best describes the
mechanistic
approach to the study of bioeffects?
a. cause-effect
b. exposure-response
c. risk-benefit
d. causation-reaction
e. effect-microstreaming
a. cause-effect
Which of the following is associated with cavitation?
a. thermal index
b. Snell’s Law
c. Avagadro’s Number
d. mechanical index
d. mechanical index
The Fresnel is the:
a. focus
b. near zone
c. farzone
d. penetrationdepth
b. near zone
How many data bits are
needed to represent 46 gray shades?
a. 46
b. 5
C. 6
d. 8
C. 6
If wires in an AIUM test object
do not appear in the same
place as on the display,
what is amiss?
a. registration accuracy
b. dynamic range accuracy
.c near gain
d. gray scale dynamic range
a. registration accuracy
The propagation speed of US
in the AUIM test object is:
a. 1m/s
b. 1.54 m/s
c. 1.54 mm/us
d. 1 km/s
c. 1.54 mm/us
Enhancement, multipath
and
side lobes result in:
a. image distortion
b. clearer images
c. artifact
d. resolution problems
c. artifact
(True or False) A mirror image artifact can appear along side
of the true anatomy.
F
Rectification and smoothing are components of which of the following.
a. amplification
b. decompensation
c. reject
d. demoulation
d. demodulation
The more pixels per inch:
a. the better the temporal resolution
b. the better is the spatial
resolution
c. more shades of gray
d. the higher the reliability
b. the better is the spatial
resolution
The more bits per pixel:
a. the better the resolution
b. the higher the pixel density
c. the more shades of gray
d. higher reliability
c. the more shades of gray
The digital scan converter has a number of pixels assigned to each bit.
F
Lateral resolution can be
improved by:
a. increasing gain
b. decreasing gain
c. focusing
d. smoothing
c. focusing
At the focus, the beam
d i a m e t e r i s ——– the transducer diameter
a. equal to
b. half
c. double
d. one-fourth
b. half
If we increase the transducer
diameter, the beam diameter in far zone
a. increased
b. decreased
c. unchanged
b. decreased
If the transducer diameter
increases, the lateral
resolution at the smallest dimension is
a. increased
b. decreased
c. unchanged
a. increased
If we increase the freq the near zone length is
a. increased
.b decreased
c. unchanged
a. increased
Which is not a part of a
transducer?
a. active crystal
b. matching layer
c. A/D converter
d. wire
c. A/D converter
What is the production of a voltage from deformation
a. piezoelectricity
b. impedence
c. cogeneration
d. flux
a. piezoelectricity
