Brainscape's Knowledge GenomeTM

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


See full index

Physic 2 > Memory and Display > Flashcards

Memory and Display Flashcards

1
Q

what does the memory allow us to store

A

the image

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

what is memory responsible for

A

grayscale

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

memory enables what

A

freeze frame
cine-loop
the ability to post-process the image

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

what is another name for the memory

A

scan converter

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

what is designed to store ultrasound information and what does it enable the machine to do

A

modules or circuits

enables the machine to build up the image

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

from the memory where does the image go to

A

a display or recording device

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

historically scan conversion was what kind of process

A

analog

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

current systems use what kind of scan converter

A

digital

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

what is the difference between analog and digital scan converters

A

analog: stores voltages
digital: stores binary code

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

analog memory is

A

continuous values
prone to drift
less reproducible

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

digital memory is

A

discrete numbers
stable
reproducible

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

an analog scan converters’ charge is proportional to what

A

the amplitude of signal strengths

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

main advantage of the analog scan converter

A

allows for grey scale

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

analog scan converter also acts a what between the image and display

A

buffer

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

does the analog scan converter have a good short term memory

A

yes

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

what is the disadvantage of the analog scan converter

A

prone to drift

no long term memory

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

this type of scan converter is reliable and vestile

A

digital

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

digital scan conveters can be connected to what

A

many other systems or cameras

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

does the digital scan converter have superior resolution

A

yes

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

a digtial scan converter consists of what

A

a matrix

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

a digital scan converters matrix is typically

A

1024 x 768

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

the matrix is divided into small rectangular squares picture elements called

A

pixels

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

each pixel contains a

A

digital number

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

each digital number represents

A

the amplitude of the received echo

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

a 1024 x 768 matrix has how many pixels

A

786432

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

the matrix is essentially

A

a checkerboard arrangement of pixel locations on a gird

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

each square of the matrix does what

A

stores data that represents the greyscale information of the returning echoes

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

the monitor should be thought as

A

the matrix with each square corresponding to a particular depth

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

computers operate in

A

binary code

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

binary is the language that only uses what

A

1’s and 0’s

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

that data contained within each square of the matrix is equal to what

A

a one or zero

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

how many shades of grey can be displayed then

A

256

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

in order to get severak shades of grey

A

additional matrices must be stacked one on top of another so that every pixel location can be represented by several ones and zeros

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

the combination of the binary digit can represent what

A

many shades of grey

35
Q

a pixel is

A

a picture element and is the smallest form of display

36
Q

more pixels means what

A

better resolution

37
Q

one binary digit is called a

A

bit

38
Q

a Bit is either a

A

1 or 0

39
Q

8 bits of data is a

A

byte

40
Q

word

A

combination of bits expressed as a unit

41
Q

word length

A

number of bits in a word

42
Q

bit depth

A

the word length at each address location

43
Q

RAM

A

random access memory

fast,rewritable,cheap and erased when machine is turned off

44
Q

ROM

A

read only memory

permanent and used for system funtions

45
Q

the formula for calculating the shades of grey is

A

2^n

46
Q

as bit depth increases

A

the shades of gray that the system can produce increases

47
Q

what does n represent

A

the bit depth or the number of bits used at each adress location to store the echo data received

48
Q

typically ultrasound machines have how many bits

A

8

49
Q

a bit depth of 8 has how many shades of grey

A

256

50
Q

the binary system relies on a how many digits

A

2

51
Q

1 or 0 represent a

A

circuit that is either on or off

52
Q

the computer only has to process 2 numbers so is this process fast and very stable

A

yes

53
Q

ultrasound systems operate to provide

A

the best resolution images but this is limited by the type of display used

54
Q

the two considerations made for monitor resolution are

A

number of pixels

size of the pixels

55
Q

more pixels in a finite space

A

the better the resolution will be

56
Q

why will the resolution be better if there is more pixels

A

because the size of the pixels must decrease to fit the monitor

57
Q

changing the depth of the field also will impact the

A

resolution

58
Q

modern day ultrasound units use what kind of monitor for display

A

LCD

59
Q

earlier units used what kind of unit for display

A

CRT

60
Q

A-mode and B-mode used what kind of unit for display

A

oscilloscope

61
Q

the oscilloscope was the first to use what

A

CRT

62
Q

an oscilloscope can only display

A

the x and y axis and is not compatible with a video signal

63
Q

television CRT accept what kind of signal

A

video

64
Q

a television CRT is capable of what

A

displaying a wide range of grays

65
Q

if equipped the CRT is also capable of what

A

displaying colour, this is helpful for doppler applications

66
Q

CRT

A

large glass vacuum tube that contains a cathode or source of electrons

67
Q

the electron beam is aimed at what

A

a positive phosphor plate

68
Q

electrical or magnetic deflections plates are used to

A

steer the beam

69
Q

the brightness of the phosphor brightness depends on

A

the number of electrons that it strikes

70
Q

number of electrons is dependent on

A

the amplitude of the video signal

71
Q

to obtain colour how many electron guns are fired

A

three

72
Q

what do the three electron guns cause the phosphor to light up to ehich colours

A

red
green
blue

73
Q

different mixes of these colours produce

A

all the colours that are seen when watching tv

74
Q

raster format

A

a specific method to move the electron beam

75
Q

the beam moves in which direction

A

left to right

76
Q

interlacing

A

writes the even and than odd lines of scan data

77
Q

a complete CRT frame consist of how many horizontal lines

A

525

78
Q

1 frame rate is

A

30 Hz

79
Q

each frame has two fields produced at

A

60 Hz

80
Q

computer mointors are superior to CRT in which way

A

have more scan lines and pixels

as well the pixels are smaller

81
Q

more pixels mean

A

higher resolution

82
Q

monitors use how many scan lines

A

1024 x 768 or higher

83
Q

the scan lines are written in what kind of manner

A

progressive manner with frame rates typically higher than 60Hz

Physic 2 (5 decks)

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