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DMSO Physics 2 > Reverse chapter 15 > Flashcards

Reverse chapter 15 Flashcards

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1
Q

2 shades; black and white High Contrast

A

Bistable

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2
Q

Multiple levels of gray Low Contrast

A

Gray Scale

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3
Q

“real world” numbers unlimited # of choices continuous values

A

Analog

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4
Q

“computer” numbers limited choices discrete values

A

Digital

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5
Q

determines the range of brilliance within the displayed image

A

Contrast

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6
Q

determines the range of the displayed image

A

Brightness

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7
Q

translates the information from the spoke format into the video format

A

Scan convertor

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8
Q

image detail

A

Spatial resolution

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9
Q

image fade image flicker instability deterioration

A

Disadvantages of analog scan convertors

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10
Q

Uniformity Stability Durability Speed Accuracy

A

Advantages of digital scan convertors

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11
Q

smallest building block of a digital picture

A

Pixel

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12
Q

Number of picture elements per inch

A

Pixel Density

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13
Q

few pixels per inch larger pixels less detailed image lower spatial resolution

A

Low Pixel Density pixels per inch size of pixels detail of image spatial resolution

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14
Q

many pixels per inch smaller pixels more detailed image higher spatial resolution

A

High Pixel Density pixels per inch size of pixels detail of image spatial resolution

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15
Q

smallest amount of computer memory

A

Bit

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16
Q

group of eight bits of computer memory

A

Byte

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17
Q

computer memory consists of two bytes or 16 bits

A

Word

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18
Q

gray shades

A

Contrast Resolution

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19
Q

fewer shades of gray degraded contrast resolution

A

Fewer Bits per Pixel shades of gray contrast resolution

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20
Q

more shades of gray improved contrast resolution

A

More Bits per Pixel shades of gray contrast resolution

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21
Q

2^ number of bits

A

Calculating the shades of gray

22
Q

image element image detail spatial resolution

A

Pixels vs Bits Pixel

23
Q

computer memory gray shades contrast resolution

A

Pixels vs Bits Bits

24
Q

Analog -> analog to digital converter -> Digital memory -> digital to analog converter -> Analog

A

Analog to digital converter

25
Q

manipulating before storage in the scan convertor TGC log Compression write magnification persistence spatial compounding edge enhancement fill-in interpolation

A

Preprocessing

26
Q

manipulating after storage in the scan convertor any change after freeze frame black/white inversion read magnification contrast variation 3-D rendering

A

Postprocessing

27
Q

uses old data postprocessing larger pixel size same # of pixels as in the original ROI unchanged spatial resolution unchanged temporal resolution

A

Read Magnification

28
Q

acquires new data preprocessing identical pixel size more pixels that in the original ROI improves spatial resolution may improves temporal resolution

A

Write Magnification

29
Q

method of improving image quality

A

Coded Excitation

30
Q

higher signal to noise ratio improved axial resolution improved spatial resolution improved contrast resolution deeper penetration

A

Advantages of Coded Excitation

31
Q

reduces shadowing

A

Spatial Compounding

32
Q

reduce speckle and noise artifact

A

Frequency Compounding

33
Q

makes image look sharper

A

Edge Enhancement

34
Q

makes image smoother “super impose”

A

Temporal Compounding or Persistence

35
Q

predicts what information lies between the gaps and improves spatial resolution

A

Fill-in Interpolation

36
Q

measure how dense something is and have mechanical properties

A

Elastography

37
Q

Picture Archiving and Communications System Stored digitally

A

PACS

38
Q

Digital Imaging and Computers in Medicine set of rules, or protocols, that allows imaging system to share info on a network

A

DICOM

39
Q

charts from pen writers

A

Recording and Archiving Techniques: Paper Media Examples

40
Q

portability does not require a device to read

A

Recording and Archiving Techniques: Paper Media Advantages

41
Q

bulky, hard to store difficult to make copies cant display dynamic images

A

Recording and Archiving Techniques: Paper Media Disadvantages

42
Q

computer discs computer memory magnetic tape video tape

A

Recording and Archiving Techniques: Magnetic Media Examples

43
Q

able to store large amounts of info efficiently can store and play dynamic can record color

A

Recording and Archiving Techniques: Magnetic Media Advantages

44
Q

can be erased by strong magnetic fields

A

Recording and Archiving Techniques: Magnetic Media Disadvantages

45
Q

photographs flat films multiformat camera film

A

Recording and Archiving Techniques: Chemically Mediated Photographs Examples

46
Q

High resolution accepted in the medical community can produce color images

A

Recording and Archiving Techniques: Chemically Mediated Photographs Advantages

47
Q

bulky, difficult to store and retrieve requires chemical processing artifacts can arise from dirt pr chemical contamination

A

Recording and Archiving Techniques: Chemically Mediated Photographs Disadvantages

48
Q

laser discs compact discs

A

Recording and Archiving Techniques: Optical Media Examples

49
Q

store huge amounts of data inexpensive not erased by exposure to magnetic field

A

Recording and Archiving Techniques: Optical Media Advantages

50
Q

requires a display system no standardized format for image display and storage

A

Recording and Archiving Techniques: Optical Media Disadvantages

DMSO Physics 2 (26 decks)

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