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Ultrasound Physics > Chapter 13 > Flashcards

Chapter 13 Flashcards

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1
Q 
Which of the following forms of resolution improve when frame rate increases?
Lateral
Longitudinal
Temporal
Spatial resolution
A

Temporal

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2
Q 
Which of the following is consistent with improved temporal resolution?
Color doppler
More gray shades
More detail
Higher frame rate
A

Higher frame rate

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3
Q 
All of the following decrease temporal resolution except:
Lower frame rate
Deeper imaging
Multi-focus
Narrower sector
A

Narrower sector

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4
Q

A sonographer adjusts an ultrasound scan to double to double the depth of view from 5 cm to 10 cm. What happens to the frame rate?

A

It is halved

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5
Q

A sonographer adjusts an ultrasound scan to double the depth of view from 5 cm to 10 cm. If the frame rate remains the same, which one of the following also occurs?

A

Narrow sector

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6
Q

A sonographer adjusts an ultrasound machine to change the sector size from 90 to 45 degrees. Nothing else changes. What happens to the frame rate?

A

It is doubled

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7
Q

A sonographer adjusts an ultrasound machine to change the sector size from 90 to 45 degrees. The frame rate was unchanged. What else must have happened?

A

Line density was doubled

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8
Q 
A sonographer, using a phased array ultrasound system, turns off the multi-focus feature. What is the most likely consequence of this action?
Frame rate decreases
Temporal resolution degrades
Imaging depth increases
Temporal resolution improved
A

Temporal resolution improves

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9
Q 
A sonographer increases the line density from 1 line per degree of sector to 3 lines per degree of sector. What is the most likely consequence of this action?
Frame rate increases
Temporal resolution decreases
Imaging quality decreases
Temporal resolution increases
A

Temporal resolution decreases

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10
Q

A sonographer reduces the sector angle from 90 degrees to 30 degrees. At the same time, the ultrasound system automatically increases the line density from 1 line per degree to 2 lines per degree. No other changes are made. What will happen to the frame rate?

A

Increases

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11
Q

A sonographer reduces the sector angle from 90 degrees to 30 degrees. At the same time, the ultrasound system automatically increases the line density from 1 line per degree to 3 lines per degree. No other changes are made. What will happen to the temporal resolution?

A

Remains unchanged

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12
Q 
Which of the following is most important in determining the frame rate of a system?
Speed of sound in the medium
Dynamic range of the receiver
Transducer frequency 
Transmitter output
A

Speed of sound in the medium

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13
Q 
Which of the following is most important in determining the frame rate of a system?
Depth of view
Dynamic range of the receiver
Transducer frequency
Transmitter output
A

Depth of view

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14
Q

What is the frame rate if each image of the ultrasound system is created in 0.02 sec (1/50 sec)?

A

50 Hz

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15
Q

What is the time needed to make a single image if the frame rate of an ultrasound system is 20 Hz?

A

0.05 s

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16
Q

T or F. The critical factor in determining frame rate, line density, and imaging depth is the transducer style.

A

False

17
Q

T or F. The number of liner per frame and the frame rate determine the frequency.

A

False

18
Q

T or F. The number of liner per frame and the frame rate determine the PRF?

A

True

19
Q

T or F. If the imaging depth of a scan is 15 cm and there are 100 lines in the image, then the number of pulses making up the scan is 1500.

A

false

20
Q

T or F. If the imaging depth of a scan is 15 cm and there are 100 lines in the image, then the number of pulses making up the scan is 100.

A

True

21
Q

T or F. If 100 scan lines make up an image and the frame rate is 30 per second, then the transducer’s frequency is 3,000 Hz.

A

False

22
Q

T or F. If 100scan lines make up an image and the frame rate is 30 per second, then the system’s pulse repetition frequency is 3,000 Hz.

A

True

23
Q

When the frame rate is 30 Hz, how long does it take to create a frame?

A

1/3 seconds

24
Q

Under certain conditions, an ultrasound creates each image in 0.01 seconds. What is the frame rate?

A

200 Hz

25
Q

What is the fundamental limitation of temporal resolution?

A

Speed of sound in the medium

Ultrasound Physics (30 decks)

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