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Digital detectors > Digital detector questions in class > Flashcards

Digital detector questions in class Flashcards

1
Q

A tape, a disc are __

A

archiving info

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2
Q

The __ represents zero or one

A

bit

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3
Q

digital imaging cassettes and film screen sets can be used interchangeable with any x-ray system t or f

A

true

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4
Q

A digital imaging screens respond to radiation with what

A

photostimulable plates

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5
Q

The four steps of creating an image with digital imaging equipment are what steps

A

erase always last

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6
Q

Digital imaging has a ___ compared to film screen

A

better contrast resolution

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7
Q

film has a better ___then film

A

dynamic range

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8
Q

___is prevented when erased with light

A

ghosting

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9
Q

A latent image is formed on what in digital imaging

A

on the radiation detector

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10
Q

spatial resolution is increased with what in digital imaging

A

matrix size

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11
Q

the number of of grays in digital imaging is determined by what

A

bit-depth

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12
Q

__ requires the largest matrix size

A

mammography

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13
Q

the typical matrix size for digital radiography is what?

A

1024 x 1024

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14
Q

spatial resolution is determined by the ratio what to what

A

matrix size

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15
Q

digital imaging cassette based uses what for latent image formation

A

photostimulable (psp) –

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16
Q

charged couple device in digital radiography provides what

A

good resolution —more to answer

17
Q

Flat panel devices use ___

A

thin film transistors

18
Q

spatial resolution is limited to what in digital imaging

A

pixel size

19
Q

human visual system can visualize how many shades of gray

A

30

20
Q

the number of grays a system can reproduce is called a what?

A

dynamic range

21
Q

the ___digital system uses the highest dynamic range

A

mammography

22
Q

digital imaging pt dose can be reduced by using

A

higher KVP

23
Q

DQE stands for what

A

detective quantum efficiency

24
Q

higher probability of

A

detective quantum efficiency

25
Q

almost off digital images are interpreted in what?

A

digital display device

26
Q

national standard transmitting in teleradiograhy is what

A

DICOM

27
Q

A ghost image can occur because of what

A

incomplete erasing

28
Q

does not store memory

A

ram

29
Q

when main power of cpu is turned off what is maintained

A

rom

30
Q

an 8 bit word is called __

A

byte

31
Q

most common phosphor used in radiography plates

A

barium flourohalide

32
Q

the term to describe the continuous analong voltage signal into a descete is called a what

A

digitizing

33
Q

insufficient amount of mAs will produce what

A

noise

34
Q

What is used for cassette based

A

PSP

35
Q

CAD stand for

A

computer aided detection–high lights densities (used in mammography)

36
Q

cassette-less uses

A

psp or flat panel or CCD (charged couple device)

Digital detectors (2 decks)

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