Ch 13 Q & A Flashcards Preview

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Flashcards in Ch 13 Q & A Deck (25):
1

Which of the following forms of resolution improve when frame rate increases?

A. Lateral
B. Longitudinal
C. Temporal
D. Spatial Resolution

C

2

Which of the following is consistent with improved temporal resolution?

A. Color Doppler
B. More grey shades
C. more detail
D. higher frame rate

D

3

All of the following decrease temporal resolution except:

a. lower frame rate
b. deeper imaging
c. multi-focus
D. narrower sector

D

4

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

a. it is halved
b. it doubles
c. it increases from 5 to 10 Hz
d. it is unchanged

A

5

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

a. increase line density
b. wider sector
c. mutli-sector imaging turned on
d. narrower sector

D

6

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

a. it is doubled
b. it remains unchanged
c. it is halved
d. it is tripled

A

7

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

A. temporal resolution was doubled
B. sector size was doubled
C. line density was doubled
D. imaging depth was halved

C

8

A sonographer, using phased array ultrasound system, turns off the multi-focus feature. What is the most likely consequence of this action?

a. frame rate decreases
b. temporal resolution degrades
c. imaging depth increases
d. temporal resolution improves

D

9

A sonographer increases the line density from 1lines per degree of sector to 3 liens per degree of sector. What is the most liely consequence of this action?

A. frame rate increases
B. temporal resolution decreases
C. imaging quality decreases
D. temporal resolution increases

B

10

A sonographer reduces the sector angle form 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
B. decreases
C. remains unchanged

A

11

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

A. increases
B. decreases
C. remains the same

C

12

Which of the following is most important in determining the frame rate of a system?

a. speed of sound in a medium
b. dynamic range of the receiver
c. transducer frequency
d. transmitter output

A

13

Which of the following is most important in determining the frame rate of system?

a. depth of view
b. dynamic range of the receiver
c. transducer frequency
d. transmitter output

A

14

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

a. 20 Hz
b. 100 Hz
c. 50 Hz
d. 15 Hz

C

15

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

A. 1 s
B. 0.02 s
C. 0.05 s
D. 15 Hz

C

16

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

False

17

True or False. The number of lines per frame and the frame rate determine the frequency.

False

18

True or False. The number of lines per frame and the frame rate determining the PRF.

True

19

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

False

20

True or False. If the imaging depth of a scan is 50 cm and there are 100 lines in the image, then the number of pulses making up the scan is 100.

True

21

True or False. If 100 scan lines make up an image and the frame rate is 30 per second, then the transducer's frequency is 3000 Hz.

False

22

True or False. If 100 scan lines make up an image and the frame rate is 30 per second, then the systems PRF is 3000 Hz.

True

23

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

A. 30 sec
B. 3 sec
C. 0.3 sec
D. 1/30 sec
E. 1/3 sec

D

24

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

a. 1 Hz
b. 10 sec
c. 100 Hz
d. 200 Hz
e. 0.02 Hz

C

25

What is the fundamental limitation of temporal resolution?

A. imaging depth
B. speed of sound in the medium
C. line density
D. sector size

B