Brainscape's Knowledge GenomeTM

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


See full index

Physics 2 > Lesson 7 > Flashcards

Lesson 7 Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

Image memory

A

Is a continuous process as you scan, where the image frames are stored here as information

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

What is another term for image memeory?

A

Digital memory

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

Freeze frame

A

Holding and displaying one frame out of the sequence

- shows the last frame

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

Cine loop

A

Storing of the last several frames before freezing

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

How many frames can the cine loop hold?

A

100-130

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

What is each frame made up of?

A

Matrix’s of tiny blocks called pixels

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

What does it mean if you have more pixels?

A

You will have better resolution

- the more you have the better

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

What does each pixel contain?

A

Information about the brightness (intensity/amplitude) at a particular anatomical position

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

What are pixels known as?

A

Memory elements

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

Bits

A

Numbers that are stored in the memory elements (pixels) according to the intensity of the echoes received from the corresponding anatomical positions

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

What can 1 matrix only show?

A

2 shades of gray

- black or white

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

What is it called when you are only working with 2 shades of gray?

A

Bistable

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

What happens when you have more bits?

A

You get more shades of gray

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

What can each pixel have?

A

Multiple bits

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

What are multiple bits known as?

A

Binary digits

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

What does each column in our binary table represent?

A

A bit

17
Q

What do the numbers in your table create?

A

The number of the different shades of gray

18
Q

Why do computer memories and processors use binary numbers to carry out their functions?

A

Because they contain electronic components (switches) that operate in only 2 states
- either 0 or 1

19
Q

What is detailed resolution usually limited by? (2)

A
  1. SPL
  2. Beam width
  • rather than pixel density and the memory
20
Q

How many different numbers can you create with 2 bits?

A

2^2 = 4

- different shades of gray

21
Q

How many different numbers can you create with 3 bits?

A

2^3 = 8

- different shades of gray

22
Q

How many different numbers can you create with 8 bits?

A

2^8 = 256

- different shades of gray

23
Q

What do the majority of US machines use for bits?

A

6-8 bits

24
Q

How many shades of gray can humans see?

A

100

25
Q

What does more bits/pixels allow?

A

More shades of gray and better resolution

26
Q

What is the number binary system?

A

It is an alternative to the decimal (arabic) number system

- they simplify the design of computers and related technologies

27
Q

Contrast resolution

A

Begin to be able to separate 2 different echoes as 2 different shades of gray

28
Q

What is the formula for contrast resolution?

A

CR = dB/# of shades

  • CR = contrast resolution
  • dB = dynamic range (in decibles)
  • # of shades = bits per pixel
29
Q

How do you convert bits to shades?

A

2^x

30
Q

Do we have better or worse contrast resolution with bits/pixels?

A

Better

- we want the smallest number possible for contrast resolution

31
Q

Is dynamic change operator dependent?

A

Yes

32
Q

Is bits and pixels operator dependent?

A

No

- manufacture dependent

33
Q

What does it mean if you have more shades of gray? (2)

A
  1. More contrast

2. Grainier images

34
Q

What does it mean if you have less shades of gray? (2)

A
  1. Less contrast

2. Smoother images

35
Q

How many bits are in 1 byte?

A

8

36
Q

How many bits and bytes are in 1 kilobyte? (2)

A
  1. Bits = 8192

2. Bytes = 1024

37
Q

Digital-to-analog converter

A

Once a frame is preprocessed, stored in the image memory, pulled from the image memory and post processed, it is ready to be sent to the display
- digital memories (numbers) –> voltage for display

38
Q

What does digital-to-analog converter require?

A

Analog signals

39
Q

What does voltage for display determine?

A

The echo brightness that is going to be displayed

Physics 2 (10 decks)

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