Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

SPI Click to Learn > Ultrasound Transducers > Flashcards

Ultrasound Transducers Flashcards

1
Q

When scanning the thyroid, you change from a 5MHz probe to a 10MHz probe. Which of the following statements is true

A. the spatial resolution will improve with the 10MHz transducer
B. the 2D imaging depth settings are much more limited in the 5MHz transducer
C. there will be decreased attenuation with increased penetration with the 10MHz probe
D. the reflected waves will be more quickly received and processed by the 10MHz probe

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The coupling gel used for ultrasound exams provides the same function as what transducer component

A. matching layer
B. backing layer
C. PE element
D. damping layer

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Which of the following statements is true regarding damage to the matching layer of the transducer

A. it causes an increased risk of electrical shock to the patient
B. the use of more acoustic gel is required to increase the distance between the probe and the skin surface
C. it causes an increase in the intensity of the beam and increased exposure to the patient
D. it is normal for it to develop small holes after extended use

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

As transducer frequency increases

A. lateral resolution will improve, but axial resolution will be degraded
B. lateral resolution will be degraded, but axial resolution will improve
C. axial and laeral resolution will improve
D. axial and lateral resolution will be degraded

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which of the following transducers will provide the deepest natural focus

A. low frequency, small diameter
B. low frequency, large diameter
C. high frequency, large diameter
D. high frequency, small diameter

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

As the propagation speed of the crystal increases, the frequency of the transducer

A. decreases
B. does not change
C. increases
D. depends on the thickness and diameter of the crystal

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Mirrors and lenses can be used to

A. improve sound transmission into the body
B. increase the PRF of the transducer
C. mechanically focus the US beam
D. electronically focus the US beam

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Linear phased arrays utilize what type of focusing

A. mechanical only
B. electronic only
C. elevational only
D. mechanical and electronic

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The crystal in the ultrasound transducer converts

A. electrical energy into heat energy
B. electrical energy into mechanical energy
C. mechanical energy into heat energy
D. mechanical energy into sound energy

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which system component improves lateral resolution

A. backing material
B. matching layer
C. pulser
D. thicker PE element

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

All of the following transducers can be focused at multiple depths except

A. mechanical single element
B. annular phased
C. curvilinear phased
D. linear phased

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which of the following is necessary for a multihertz transducer

A. broad bandwidth
B. two different sizes of piezoelectric elements
C. two piezoelectric elements
D. narrow bandwidth

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

To obtain a longer near zone

A. add a lens to the transducer face
B. change from a 3MHz to a 6MHz transducer
C. decrease the transducer element diameter
D. use a linear transducer instead of a curved transducer

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Which of the following statements correctly describes annular arrays

A. an annular array can electronically focus the beam
B, an annular array can use phasing to electronically steer the beam
C. annular arrays provide the lowest slice thickness resolution
D. annular arrays usually contain 30 or more circular elements

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Which of the following applies to therapeutic ultrasound transducers

A. low q factor
B. frequencies >15MHz used due to the increased potential for focused cavitation
C. narrow bandwidth
D. backing material at least 2x thickness of that used in imaging transducers

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Which of the following describes a multi-dimensional array

A. has less than 100 elements that can be fired simultaneously
B. has less than 100 elements that can be fired sequentially
C. offers increased slice thickness and improved spatial resolution
D. has thousands of elements arranged in a matric pattern

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What type of transducer array has the fewest number of elements

A. mechanical transducer
B. linear phased array
C. curvilinear sequential array
D, annular array

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

The damping material causes a _______ bandwidth and a _______ quality factor

A. wider, higher
B. narrower, lower
C. narrower, higher
D. wider, lower

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Which two factors determine the focal depth of a transducer

A. element diameter and frequency
B. element thickness and diameter
C. propagation speed and element diameter
D. element thickness and frequency

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Which of the following statements is true regarding the advantage of a mechanical annular probe over the mechanical single element probe

A. the array of elements allows for electronic steering which is not possible with a single element
B. the array of elements allows for electronic focusing which is not possible with a single element
C. the array of elements allows for mechanical steering which is not possible with a single element
D. the single element probe will have a higher temporal resolution than the annular array

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Transducers can be electronically focused by

A. varying timing of the release of the pulses
B. adding an acoustic lens to the face of the transducer
C. using a convex shaped PE element
D. using a concave shaped element

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Which of the following can be done to reduce the beam divergence

A. deactivate dynamic focusing
B. remove an acoustic lens in front of the PE element
C. switch to a lower frequency transducer
D. switch to a higher frequency transducer

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Which of the following transducers is capable of electronic beam steering

A. curviliear sequental array
B. mechanical
C. curvilinear phased array
D. linear sequential array

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Which of the following transducers will produce the highest frequency sound waves

A. 2mm element thickness, 6mm/microsec prop speed of the element
B.6mm element thickness, 6mm/microsec prop speed of the element
C. 2mm element thickness, 2mm/microsec prop speed of the element
D. 6mm element thickness, 6mm/microsec prop speed of the element

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

All of the following are coupling agents or medium typically for US exams except

A. water
B. KY jely
C. gastrografin
D. ultrasound gel

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Transducers can be electronically focused by

A. adding an acoustic lens to the face of the transducer
B. using a convex shaped PE element
C. varying timing of the release of the pulses
D. using a concave shaped element

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What changes occur to the ultrasound beam when timed pulses are emitted from right to left from the elements of the phased transducer

A. the beam is steered to the left
B. the beam is steered to the right
C. a trapezoidal image is displayed
D. the focal depth moves closer to the transducer face

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Which type of transducer has the smallest field of view in the near field

A. sector
B. vector
C. linear
D. curvilinear

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

As the element diameter decreases, the focal length _____

A. will remain unchanged unless the element thickness also changes
B. will remain unchanged unless the frequency also changes
C. will increase
D. will decrease

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Some US transducer arrays allow you to reduce the thickness of the beam as an additional type of focusing. What effect will this change have on the image

A. improved contrast resolution
B. decreased beam attenuation
C. degraded temporal resolution
D. improved elevational resolution

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Which of the following correctly describes how a linear array transducer produces a trapezoid field of view

A. PE elements are stimulated by timed voltage spikes produced in a convex pattern
B. PE elements are stimulated by timed voltage spikes produced in a concave pattern
C. PE elements are stimulated by timed voltage spikes produced first on the right and moving to the left side of the array
D. PE elements are stimulated by timed voltage spikes produced first on the left and moving to the right side of the array

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Which of the following correctly describes phased array transducers

A. all phased array transducers are steered electronically
B. a sector phased array has a trapezoidal field of view
C. a vector phased array can produce a trapezoidal image
D. all phased array transducers are focused electronically

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Which of the following transducers would have the best axial resolution

A. 2mm element diameter
B. 2mm spatial pulse length
C. 4mm element diameter
D. 4mm spatial pulse length

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

As frequency increases, the axial resolution will

A. be degraded
B. depends on how the PE elements are arranged
C. improve
D. remain unchanged

A

C

35
Q

The wider the element diameter, the

A. shorter the near zone
B. greater the probe frequency
C. lower the beam intensity
D. greater the beam divergence in the far field

A

C

36
Q

As the transducer frequency increases, the quality factor

A. increases
B. changes only if a different PE element is used
C. decreases
D. does not change

A

A

37
Q

Which of the following describes the type of focusing used in an annular phased array

A. single focal point that is adjustable by the technologist
B. fixed focus set by the manufacturer
C. mechanical focusing using curved elements
D. focusing at multiple levels across all depths of the image

A

D

38
Q

The wider the element diameter, the

A. longer the near zone
B. greater the beam intensity
C. greater the probe frequency
D. greater the beam divergence in the far field

A

A

39
Q

As beam width increases, how is intensity affected

A. increases
B. no change, except in endocavity probes where intensity increases
C. no change, exceot in endocavity probes where intensity decreases
D. decreases

A

D

40
Q

Which of the following correctly describes how the elements of a sequential linear transducer are excited

A. varies with transmitted frequency of the transducer
B. elements are excited left to right with a 0.01ms between each voltage spike
C. in a specific order that does not change
D. varies with exam preset selection on the system

A

C

41
Q

_______ used to form the sector shaped field of view for a phased array transducer

A. the curved arrangement of the elements are
B. electronic focusing is
C. electronic steering is
D. an acoustic lens is

A

C

42
Q

If you change from a transducer with a 40mm crystal thickness to one with a 20mm crystal thickness, the frequency of the sound produced will

A. double
B. decrease by 1/4
C. increase by a factor of 4
D. increase by 1/2

A

A

43
Q

As the area of the beam increases,

A. the intensity of the beam decreases
B. the frequency increases
C. the intensity of the beam increases
D. the wavelength increases

A

A

44
Q

Which of the following correctly describes a dedicated continuous wave doppler transducer

A. cork or epoxy for backing material
B. very low duty factor
C. narrow bandwidth
D. low quality factor

A

C

45
Q

Which of the following transducer frequencies can be used for imaging or therapeutic purposes

A. 5MHz
B. 15MHz
C. 1MHz
D. 3MHz

A

D

46
Q

Which of the following transducers uses a beam former

A. sequential curved linear array
B. mechanical transducer
C. sector phased array
D. sequential linear array

A

C

47
Q

What type of transducer array has the fewest number of elements

A. curvilinear sequential array
B. mechanical transducer
C. annular array
D. linear phased array

A

C

48
Q

Which statement regarding high frequency transducers is correct

A. higher frequency transducers provide improved image resolution because the sound travels faster through the tissues to provide a more accurate display
B. higher frequency transducers always have low signal to noise ratio
C. a multi-hertz transducer operates at multiple frequencies and offers a broad bandwidth
D. harmonic imaging should never be used on transducers over 12MHz

A

C

49
Q

Spatial compounding requires a transducer that can perform

A. electronic steering
B. dynamic frequency tuning
C. harmonic imaging
D. electronic focusing

A

A

50
Q

Which two factors determine the focal depth of a transducer

A. element thickness and frequency
B. element thickness and diameter
C. prop speed and element diameter
D. element diameter and frequency

A

D

51
Q

Which of the following statements is true regarding the differences between a vector array compared to a phased sector array

A. the vector array provides better penetration capabilities than the phased sector array
B. the vector array has a smaller footprint than the phased sector array
C. the vector array has a smaller near field FOV than the phased sector array
D. the vector array is mechanically steered while the phased sector array is electronically steered

A

B

52
Q

Which of the following statements is true regarding the advantage of a mechanical annular probe over the mechanical single element probe

A. the array of elements allows for electronic steering which is not possible with a single element
B. the array of elements allows for electronic focusing which is not possible with a single element
C. the array of elements allows for mechanical steering which is not possible with a single element
D. the single element probe will have higher temporal resolution than the annular array

A

B

53
Q

Transducers can be electronically focused by

A. varying timing of the release of the pulses
B. using a convex shaped PE element
C. adding an acoustic lens to the face of the transducer
D. using a concave shaped element

A

A

54
Q

Mirrors and lenses can be used to ______

A. improve sound transmission into the body
B. electronically focus the US beam
C. mechanically focus the US beam
D. increase the PRF of the transducer

A

C

55
Q

Which of the following transducers is capable of electronic beam steering

A. mechanical
B. curvilinear sequential array
C. linear sequential array
D. curvilinear phased array

A

D

56
Q

Lowering the transducer frequency will

A. increase sector size
B. increase the mechanical index
C. improve temporal resolution
D. decrease the prop ospeed

A

B

57
Q

During an exam, you change from a 5MHz transducer to a 3MHz transducer. What happens to the period of the waves produced from the new transducer

A. increases
B. decreases
C. remains constant
D. unable to determine

A

A

58
Q

Linear phased arrays utilize what type of focusing

A. mechanical only
B. electronic only
C. elevational only
D. mechanical and electronic

A

D

59
Q

Which of the following transducers will produce the lowest frequency sound waves

A. 2mm element thickness, 2mm/microsec prop speed of the element
B. 2mm element thickness, 6mm/microsec prop speed of the element
C. 6mm element thickness, 6mm/microsec prop speed of the element
D. 6mm element thickness, 2mm/microsec prop speed of the element

A

D

60
Q

The crystal in the ultrasound transducer converts

A. electrical energy into heat energy
B. mechanical energy into heat energy
C. electrical energy into mechanical energy
D. mechanical energy into sound energy

A

C

61
Q

Which of the following can be done to reduce the beam divergence

A. switch to a lower frequency transducer
B. switch to a higher frequency transducer
C. remove an acoustic lens in front of the PE element
D. deactivate dynamic focusing

A

B

62
Q

Lowering the transducer frequency will

A. decrease the prop speed
B. increase the sector size
C. improve temporal resolution
D. increase the mechanical index

A

D

63
Q

Which of the following correctly describes an annular array

A. improved temporal resolution is a primary advantage of annular arrays
B. produces a sector shaped field of view with a flat top
C. produces a trapezoid shaped field of view
D. offers excellent lateral resolution

A

D

64
Q

Which of the following transducers uses a beam former

A. mechanical transducer
B. sequential linear array
C. sector phased array
D. sequential curved linear array

A

C

65
Q

To obtain a longer near zone

A. add a lens to the transducer face
B. change from a 3MHz to a 6MHz transducer
C. decrease the transducer element diameter
D. use a linear transducer instead of a curved transducer

A

B

66
Q

As transducer frequency increases

A. lateral resolution will improve, but axial resolution will be degraded
B. lateral resolution will be degraded, but axial resolution will improve
C. axial and lateral resolution will improve
D. axial and lateral resolution will be degraded

A

C

67
Q

When scanning the thyroid, you change from a 5MHz probe to a 10MHz probe. Which of the following statements is true

A. the spatial resolution will improve with the 10MHz transducer
B. There will be decreased attenuation with increased penetration with the 10MHz probe
C. the reflected waves will be more quickly received and processed by the 10MHz probe
D. the 2D imaging depth settings are much more limited in the 5MHz transducer

A

A

68
Q

Which of the following is true regarding annular arrays and linear arrays

A. annular arrays can be electronically steered, linear arrays must be mechanically steered
B. annular arrays must be mechanically steered, linear arrays use electronic steering
C. Annular arrays and linear arrays can be electronically steered
D. Annular arrays have multiple elements, linear arrays have a single element

A

B

69
Q

Which of the following statements is true regarding the differences between a vector array compared to a phased sector array

A. the vector array has a smaller near field FOV than the phased sector array
B. the vector array provides better penetration capabilities than the phased sector array of the same MHz
C. the vector array has a smaller footprint than the phased sector array
D. the vector array is mechanically steered while the phased sector array is electronically steered

A

C

70
Q

Mirrors and lenses can be used to

A. increase the PRF of the transducer
B. electronically focus the US beam
C. mechanically focus the US beam
D. improve sound transmission into the body

A

C

71
Q

As the transducer frequency increases, the quality factor

A. does not change
B. changes only if a different PE element is used
C. increases
D. decreases

A

C

72
Q

As the prop speed of the crystal increases, the frequency of the transducer

A. decreases
B. does not change
C. increases
D. depends on the thickness and diameter of the crystal

A

C

73
Q

Which of the following is correct regarding endocavity probes

A. endocavity probes offer improved lateral resolution at greater depths
B. they most commonly incorporate a curved array of elements thay are electronically steered to create an extended field of view
C. they should be cleaned and soaked in a high level disinfectant at least once a day
D. one of the main disadvantages of the tightly curved elements of the endocavity probe is decreased spatial resolution

A

B

74
Q

Spatial compounding requires a transducer that can perform

A. dynamic frequency tuning
B. electronic steering
C. harmonic imaging
D. electronic focusing

A

B

75
Q

The damping material causes a ______ bandwidth and a ______ quality factor

A. narrower, higher
B. narrower, lower
C. wider, higher
D. wider, lower

A

D

76
Q

Which of the following transducer frequencies can be used for imaging or therapeutic purposes

A. 15MHz
B. 5MHz
C. 1MHz
D. 3MHz

A

D

77
Q

Which of the following statements correctly describes annular arrays

A. an annular array can electronically focus the beam
B. an annular array can use phasing to electronically steer the beam
C. annular arrays provide the lowest slice thickness resolution
D. annular arrays usually contain 30 or more circular elements

A

A

78
Q

Some US transducer arrays allow you to reduce the thickness of the beam as an additional type of focusing. What effect will this change have on the image

A. degraded temporal resolution
B. decreased beam attenuation
C. improved contrast resolution
D. improved elevational resolution

A

D

79
Q

Materials used for the matching layer of a transducer must have an impedance between impedance levels of the

A. skin and PE element
B. acoustic gel and air
C. PE element and damping layer
D. skin and acoustic gel

A

A

80
Q

Transducers can be electronically focused by

A. adding an acoustic lens to the face of the transducer
B. using a convex shaped PE element
C. varying timing of the release of the pulses
D. using a concave shaped element

A

C

81
Q

A linear transducer providing a trapezoidal image demonstrates degraded _____ resolution in the far field of the image

A. lateral
B. contrast
C. elevational
D. axial

A

A

82
Q

Which system component improves lateral resolution

A. thicker PE element
B. backing material
C. pulser
D. matching layer

A

C

83
Q

As the element diameter decreases, the focal length

A. will remain unchanged unless the element thickness also changes
B. will remain unchanged unless the frequency also changes
C. will decrease
D. will increase

A

C

SPI Click to Learn (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions