SPI Practice Test | QUESTIONS AND ANSWERS |
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Terms in this set (175)
Which of the following do the source d.
and the medium determine?
a. duty factor
b. frequency
c. propagation speed
d. axial resolution
Axial resolution is affected by all of d.
the following EXCEPT
a. frequency
b. damping
c. spatial pulse length
d. focusing
,Damping in a transducer d.
a. reduces the number of cycles in a
pulse and increases the quality
factor
b. increases the number of cycles in a
pulse and increases penetration
c. causes poor axial and lateral
resolution
d. reduces the duty factor and
increases the range of transmitted
frequencies
Far zone beam divergence can be b.
reduced on a single-element
transducer by using
a. a transducer with a smaller
element diameter
b. a higher frequency transducer
c. a lower frequency transducer or a
smaller element diameter
d. adjustable focusing
The area between the face of an d.
unfocused single-element
transducer and the point where the
beam starts to diverge is the
a. Fraunhofer zone
b. refraction zone
c. focal zone
d. near zone
,Assuming a fixed frequency, what c.
happens if the diameter of an
unfocused transducer is increased?
a. the far zone divergence increases
b. the penetration decreases
c. the length of the near zone
increases
d. the length of the near zone
decreases
Which of the following does NOT d.
affect lateral resolution?
a. focusing
b. element diameter
c. frequency
d. bandwidth
Higher frequency transducers a.
provide
a. improved lateral resolution
b. smaller Doppler shifts
c. improved axial resolution and
reduced attenuation
d. increased penetration
, Ultrasound waves that are traveling d.
through a medium consist of
a. electromagnetic and radio
frequencies
b. compressions and refractions
c. electromagnetic and ionizing
frequencies
d. compressions and rarefactions
What is the difference between c.
audible sound and ultrasound?
a. audible sound waves can travel
through a vacuum
b. audible sound has a higher
frequency
c. ultrasound has a higher frequency
d. ultrasound waves are ionizing
A decrease in the thickness of a d.
piezoelectric element will result in
a. a greater pulse duration
b. an increase in the propagation
speed
c. a decrease in the quality factor if
the bandwidth decreases
d. an increase in the frequency of the
transducer
LATEST UPDATE
Save
Terms in this set (175)
Which of the following do the source d.
and the medium determine?
a. duty factor
b. frequency
c. propagation speed
d. axial resolution
Axial resolution is affected by all of d.
the following EXCEPT
a. frequency
b. damping
c. spatial pulse length
d. focusing
,Damping in a transducer d.
a. reduces the number of cycles in a
pulse and increases the quality
factor
b. increases the number of cycles in a
pulse and increases penetration
c. causes poor axial and lateral
resolution
d. reduces the duty factor and
increases the range of transmitted
frequencies
Far zone beam divergence can be b.
reduced on a single-element
transducer by using
a. a transducer with a smaller
element diameter
b. a higher frequency transducer
c. a lower frequency transducer or a
smaller element diameter
d. adjustable focusing
The area between the face of an d.
unfocused single-element
transducer and the point where the
beam starts to diverge is the
a. Fraunhofer zone
b. refraction zone
c. focal zone
d. near zone
,Assuming a fixed frequency, what c.
happens if the diameter of an
unfocused transducer is increased?
a. the far zone divergence increases
b. the penetration decreases
c. the length of the near zone
increases
d. the length of the near zone
decreases
Which of the following does NOT d.
affect lateral resolution?
a. focusing
b. element diameter
c. frequency
d. bandwidth
Higher frequency transducers a.
provide
a. improved lateral resolution
b. smaller Doppler shifts
c. improved axial resolution and
reduced attenuation
d. increased penetration
, Ultrasound waves that are traveling d.
through a medium consist of
a. electromagnetic and radio
frequencies
b. compressions and refractions
c. electromagnetic and ionizing
frequencies
d. compressions and rarefactions
What is the difference between c.
audible sound and ultrasound?
a. audible sound waves can travel
through a vacuum
b. audible sound has a higher
frequency
c. ultrasound has a higher frequency
d. ultrasound waves are ionizing
A decrease in the thickness of a d.
piezoelectric element will result in
a. a greater pulse duration
b. an increase in the propagation
speed
c. a decrease in the quality factor if
the bandwidth decreases
d. an increase in the frequency of the
transducer
