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Rad Sciences > Sciences Unit 5 SG > Flashcards

Sciences Unit 5 SG Flashcards

1
Q

Phosphors used in CR

A

Photostimulable

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2
Q

Phosphors used in DR

A

Amorphus selenia

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3
Q

Phosphors used in indirect DR

A

Amorphus silicon

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4
Q

What is used to scan the CR IP in the reader

A

Helium-neon laser

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5
Q

During IP scanning in the reader, energy is relased in the form of

A

Light

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6
Q

What converts an electronic (analog) signal into a digital signal

A

ADC

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7
Q

Purpose of a scintillator and what is it made of

A

Absorbs photons and gives off light

cesium iodide

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8
Q

Which IR phosphor provides best resolution

Why

A

Needle

Less light divergence

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9
Q

What is a DEL

A

Pixel in a matrix basically

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10
Q

Define artifact

A 
anything on a film that is unwanted 
opening cassette in light
dust
heat
chemicals
scratches emulsion
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11
Q

Define duplitized film. What is the advantage

A

emulsion on both sides of film

decreased mas

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12
Q

What type of phosophors are contained in film emulsion

A

Silver bromide

silver iodide

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13
Q

What type of EM energies is film sensitive to

A

visible light
xray
radio waves/microwaves
not sensitive

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14
Q

Define “latent” and “manifest”

A

latent cannot see, image before processing

Manifest is visible one we can see

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15
Q

Purpose of gelatin in emuslion layer

A

suspends and separates silver crystals

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16
Q

film storage critera

A 
on end
30-60% humidity
less than 68°
in dark room
away from artifacts
17
Q

define photosensitive

A

responds to any kind of photon

18
Q

legal requirements for image ID

A 
Exposure date
pt full name
pt ID #
Institution
Anatomical side marker
19
Q

Active layer of film is called

A

emulsion

20
Q

Define absorption

A

how well it absorbs xray

21
Q

define conversion efficiency

A

ability to change xray to whatever we want it to be converted to (other form of energy)

22
Q

Overall purpose of film processing

A

make the image visible

23
Q

Purpose of developer and fixer

A

coverts silver bromide to bms
stops action of developer
unexposed silver is removed

24
Q

Four steps of processing in order

A

developing
fix
wash
dry

25
Q

why is draining wash tank important

A

prevent algae growth

26
Q

five systems of an automatic processing unit

A 
transport
dryer
replenishment
recirculation
temp control

Rad Sciences (6 decks)

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