The Intensifying Screen // Part 1

Question 1

it is the rigid, light tight container that holds the screens and film in close contact

Answer 1

cassette

Question 2

are film holders used to transport film for use without exposing the film to room light

Answer 2

cassette

Question 3

measurement of cassette when loading

Answer 3

2 to 3 inches

Question 4

it is a metal frame with low atomic number and radiolucent front

Answer 4

cassette front

Question 5

composition of cassette front

Answer 5

magnesium
bakelite or carbon fiber

Question 6

it is the compression layer that maintains proper film screen contact

Answer 6

contact felt

Question 7

it is the light tight seal that is completed by a snap

black felt is used in older styles

Answer 7

hinges

Question 8

composition of cassette back

Answer 8

manganese and lead

Question 9

it absorbs backscatter

Answer 9

lead foil

Question 10

it acts as a transducer
it intensifies the action of xrays

Answer 10

intensifying screen

Question 11

composition of intensifying screen

Answer 11

polyester base

Question 12

poor contact of intensifying screen results in:

localized ___ of recorded detail
localized _______ on the image

Answer 12

localized loss of recorded detail
localized blurring on the image

Question 13

poor film screen contact may be verified by radiographing a ___ ___ test

Answer 13

poor film screen contact may be verified by radiographing a wire mesh test

Question 14

advantages of intensifying screen

Answer 14

low radiation dose
low technical factors
high tube life

Question 15

disadvantages of intensifying screen

Answer 15

high quantum mottle
low image quality

Question 16

it provides support to the phosphor layer

Answer 16

base

Question 17

it is made of high grade cardboard, plastic or polyester

Answer 17

base

Question 18

it is the thickest layer of the intensifying screen

Answer 18

base

Question 19

thickness of base

Answer 19

1mm/1000um

Question 20

it serves to redirect light toward the film

Answer 20

reflective layer

Question 21

it intercepts light photons headed in other direction and redirects them to the film

Answer 21

reflective layer

Question 22

thickness of reflective layer

Answer 22

25um

Question 23

composition of reflective layer

Answer 23

magnesium oxide
titanium dioxide

Question 24

use of reflective layer

2x film ___ = 2x ____ = ___ mAs by _ to maintain density

Answer 24

2x film speed = 2x density = low mAs by 1/2 to maintain density

Question 25

also called crossover control layer, is designed for rare earth screens and green sensitive films

Answer 25

anti crossover layer

Question 26

it is designed for single emulsion films such as mammographic film

Answer 26

anti halation layer

Question 27

thickness of phosphor layer

Answer 27

150 to 300um or 60mg/cm^2

Question 28

size of crystal

Answer 28

5 to 15um

Question 29

it is the active and most important layer of intensifying screen that emits light during stimulation by xray

Answer 29

phosphor layer

Question 30

it is the ability to give off visible light

Answer 30

luminescence

Question 31

it is the ability of phosphor to give off light only while exposed to x-ray it is important to radiography

Answer 31

fluorescence

Question 32

it is the light emission during xray exposure or while/promptly emitted or within 10^-8 seconds

Answer 32

fluorescence

Question 33

it is continue to emit light even after xray exposure has ceased or stopped

Answer 33

phosphorescence

Question 34

it produces afterglow or screen lag and it is important to fluoroscopy

Answer 34

phosphorescence

Question 35

it is the characteristics of a good phosphor where it is the ability of the phosphor to interact with xray high Z = high DQE

Answer 35

detected quantum efficiency

Question 36

it is the characteristics of a good phosphor where it is the ability of the phosphor to convert xray into light rare earth phosphors = high CE

Answer 36

conversion efficiency

Question 37

it is the characteristics of a good phosphor where it is the specific color that the phosphors emit must match with the spectral sensitivity of the film

Answer 37

spectral matching

Question 38

it is the characteristics of a good phosphor where it is insignificant in radiography but is used in fluoroscopy

Answer 38

minimum afterglow/lag

Question 39

thickness of protective coating

Answer 39

10 to 20um

Question 40

it gives physical protection to the delicate phosphor layer

Answer 40

protective coating

Question 41

it provides a surface which can be handled and cleaned without damaging the phosphor

Answer 41

protective coating

Question 42

it prevents static buildup and transparent to xray

Answer 42

protective coating

Question 43

4 types of phosphor materials

Answer 43

calcium tungstate barium lead sulfate zinc sulfide rare earth

Question 44

it is a phosphor material introduced by Thomas Edison that responds well to xrays

Answer 44

calcium tungstate

Question 45

it is a phosphor material that used with blue sensitive films, has globular grains and 5% xray to light conversion

Answer 45

calcium tungstate

Question 46

three colors of broad band emissions

Answer 46

blue indigo violet

Question 47

scheelite

Answer 47

blue

Question 48

it is a phosphor material used to produce high speed screens it is also for high kvp techniques

Answer 48

barium lead sulfate

Question 49

another word for barium lead sulfate

Answer 49

barium flurochloride

Question 50

low mAs = high quantum mottle

Answer 50

barium lead sulfate

Question 51

it is a phosphor material, it is used in fluoroscopic screens and responds well with low intensity radiation

Answer 51

zinc sulfide

Question 52

high mAs = low quantum mottle

Answer 52

zinc sulfide

Question 53

speed of rare earth

Answer 53

1000 to 1200

Question 54

it is a phosphor material, that is more efficient in coverting xrays to light

Answer 54

rare earth

Question 55

it is a phosphor material that needs less xray energy to provide the same energy conversion as calcium tungstate

Answer 55

rare earth

Question 56

high conversion efficiency = no increase in crossover = high image sharpness

Answer 56

rare earth

Question 57

percentage of rare earth xray to light conversion

Answer 57

18 to 25%

Question 58

percentage of calcium tungstate xray to light conversion

Answer 58

5%

Question 59

it is a phosphor material, only efficient in 40 to 75 kV range

Answer 59

rare earth

Question 60

too high or low kV = high quantum mottle

Answer 60

rare earth

Question 61

it is a phosphor material, for green sensitive film and has tabular grains

Answer 61

rare earth

Question 62

lanthanum oxybromide

Answer 62

blue

Question 63

gadolinium oxysulfide

Answer 63

green

Question 64

yttrium tantalite

Answer 64

ultraviolet, violet, blue, green