Sciences Unit 5 SG Flashcards Preview

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Flashcards in Sciences Unit 5 SG Deck (26):
1

Phosphors used in CR

Photostimulable

2

Phosphors used in DR

Amorphus selenia

3

Phosphors used in indirect DR

Amorphus silicon

4

What is used to scan the CR IP in the reader

Helium-neon laser

5

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

Light

6

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

ADC

7

Purpose of a scintillator and what is it made of

Absorbs photons and gives off light
cesium iodide

8

Which IR phosphor provides best resolution
Why

Needle
Less light divergence

9

What is a DEL

Pixel in a matrix basically

10

Define artifact

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

11

Define duplitized film. What is the advantage

emulsion on both sides of film
decreased mas

12

What type of phosophors are contained in film emulsion

Silver bromide
silver iodide

13

What type of EM energies is film sensitive to

visible light
xray
radio waves/microwaves
not sensitive

14

Define "latent" and "manifest"

latent cannot see, image before processing
Manifest is visible one we can see

15

Purpose of gelatin in emuslion layer

suspends and separates silver crystals

16

film storage critera

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

17

define photosensitive

responds to any kind of photon

18

legal requirements for image ID

Exposure date
pt full name
pt ID #
Institution
Anatomical side marker

19

Active layer of film is called

emulsion

20

Define absorption

how well it absorbs xray

21

define conversion efficiency

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

22

Overall purpose of film processing

make the image visible

23

Purpose of developer and fixer

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

24

Four steps of processing in order

developing
fix
wash
dry

25

why is draining wash tank important

prevent algae growth

26

five systems of an automatic processing unit

transport
dryer
replenishment
recirculation
temp control