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Ultrasound Physics Review > Display Modes > Flashcards

Display Modes Flashcards

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1
Q

Which imaging modality places time-of-flight information on the x-axis and echo amplitude on the y-axis?

a. M-mode
b. L-mode
c. J-mode
d. A-mode

A

d. A-mode

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2
Q

Which imaging mode accurately displays reflector depth?

a. I-mode
b. L-mode
c. C-mode
d. A-mode

A

d. A-mode

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3
Q

Which imaging technique usually displays a single jagged line of varying heights?

a. A-mode
b. B-mode
c. C-mode
d. I-mode

A

a. A-mode

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4
Q

With B-mode, one which axis is the strength of the reflection input?

a. x-axis
b. y-axis
c. z-axis

A

c. z-axis

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5
Q

Which imaging modality places dots of dissimilar gray scale on the display?

a. A-mode
b. I-mode
c. B-mode
d. M-mode

A

c. B-mode

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6
Q

The mode that produces lines related to the changing position of reflectors in the body with respect to time is called ____.

a. A-mode
b. M-mode
c. B-mode
d. a la mode

A

b. M-mode

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7
Q

To which of the following do the x-axis of a B-mode, the y-axis of an M-mode and the x-axis of an A-mode all relate?

a. depth of view
b. go time
c. echo amplitude
d. time of flight

A

d. time of flight

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8
Q

Indicate which of the transducer types are appropriate answers (more than one answer may be correct).

a. linear switched array transducer
b. linear phased array transducer
c. mechanical transducer
d. annular phased array transducer
e. convex or curvilinear array transducer

With these transducers, the ultrasound beam is steered by a motor, a rotating reflecting mirror, or a similar device.

A

c. mechanical transducer

d. annular phased array transducer

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9
Q

Indicate which of the transducer types are appropriate answers (more than one answer may be correct).

a. linear switched array transducer
b. linear phased array transducer
c. mechanical transducer
d. annular phased array transducer
e. convex or curvilinear array transducer

These transducers focus the ultrasound beam electronically.

A

a. linear switched array transducer

b. linear phased array transducer

d. annular phased array transducer

e. convex or curvilinear array transducer

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10
Q

Indicate which of the transducer types are appropriate answers (more than one answer may be correct).

a. linear switched array transducer
b. linear phased array transducer
c. mechanical transducer
d. annular phased array transducer
e. convex or curvilinear array transducer

With these transducers, the ultrasound beam is focused with an acoustic lens, a mirror, or by milling the piezoelectric crustal in a curved shape.

A

a. linear switched array transducer

c. mechanical transducer

e. convex or curvilinear array transducer

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11
Q

With regard to mechanical transducers, True or False?

The ultrasound beam is directed in many different directions to create an imaging plane.

A

True

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12
Q

With regard to mechanical transducers, True or False?

The ultrasound beam is not focused electronically.

A

True

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13
Q

With regard to mechanical transducers, True or False?

There is communication between the pulser of the ultrasound system and the piezoelectric crystal of the transducer.

A

True

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14
Q

With regard to mechanical transducers, True or False?

Foci exist at multiple depths as an ultrasound beam propagates through the body.

A

False

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15
Q

Which two of the following terms are associated with phased array transducers?

a. lens
b. multi-focus
c. mirror
d. adjustable
e. external

A

b. multi-focus

d. adjustable

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16
Q

The minimum number of active elements in a mechanical transducer is:

a. 0
b. 1
c. 2
d. none of the above

A

b. 1

17
Q

Which best describes the elements in a linear phased array transducer?

a. rectangular, 1/4 wavelength thick
b. rectangular, 1/2 to 1/4 wavelength wide
c. circular
d. squares, 1/2 wavelength thick

A

b. rectangular, 1/2 to 1/4 wavelength wide

18
Q

True or False?

All phased array transducer systems direct ultrasound pulses in many directions to create a two-dimensional image.

A

True

19
Q

How are the piezoelectric crystals of a linear phased array transducer fired?

a. in a single specific pattern
b. in order, from top to bottom
c. at exactly the same time
d. at almost exactly the same time

A

d. at almost exactly the same time

20
Q

The pattern of electrical signals exciting the piezoelectric crystals of a linear phased array transducer ____.

a. typically changes from one acoustic pulse to the next
b. changes every fourth or fifth acoustic pulse
c. changes only when the maximum imaging depth changes
d. none of the above

A

a. typically changes from one acoustic pulse to the next

21
Q

True or False?

The “curved pattern” of delays in the electrical spikes used in a linear phase array transducer focuses the beam during transmission.

A

True

22
Q

True or False?

The “curved pattern” of delays in the electrical spikes used in a linear phase array transducer focuses the beam during reception.

A

False

23
Q

True or False?

Both linear and phased array technologies have the ability to variably focus an ultrasound beam to different depths.

A

True

24
Q

Which of the following forms of focusing is different from the others?

a. lens
b. mirror
c. phased
d. dynamic receive

A

d. dynamic receive

25
Q

All of the following describe dynamic receive focusing except:

a. delay pattern changes continuously throughout reception
b. may be used by single crystal transducers
c. focusing occurs at many depths
d. automatically performed by system

A

b. may be used by single crystal

26
Q

What is the shape of the elements in an annular phased array transducer?

a. rectangles
b. squares
c. wedges
d. circles

A

d. circles

27
Q

True or False?

Annular phased array transducers focus sound beams in all planes and at all depths.

A

True

28
Q

What is true of the electrical pulses that excite the active elements of an annular phased array transducer?

a. they arrive at each piezoelectric crystal at exactly the same time
b. they vary in amplitude based on the direction of the steering and focusing
c. they excite the crystals at different times, nanoseconds apart
d. they arrive at each PZT crystal at different times, microseconds apart

A

d. they arrive at each PZT crystal at different times, microseconds apart

29
Q

How are the piezoelectric crystals excited when using an ultrasound system with a sequential linear array transducer?

a. singly and in order: the first crystal, second, then the third, etc.
b. in pairs: the first two crystals, the 3rd and 4th, the 5th and 6th, etc.
c. in a specific order
d. in a random sequence

A

c. in a specific order

30
Q

Which best describes the elements in a linear sequential array transducer?

a. rectangular, 1/4 wavelength thick
b. rectangular, 1/4 to 1/2 wavelength wide
c. rectangular, 1 wavelength wide
d. squares, 1 wavelength thick

A

c. rectangular, 1 wavelength wide

31
Q

What image is created with a two-dimensional array transducer?

a. two-dimensional static image
b. two-dimensional real-time image
c. three-dimensional real-time image
d. B-mode

A

c. three-dimensional real-time image

Ultrasound Physics Review (30 decks)

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