Imaging the film

Question 1

what is a latent image?

Answer 1

invisible image formed on xray film after the xrays have hit the crystals

Question 2

How is a latent image produced?

Answer 2

xrays interact with crystals and form a latent image and light production

Question 3

How does a latent image become a visible image?

Answer 3

crystals absorb xrays and split apart- turn black. once the film is developed- latent image is converted into visible image

Question 4

wide latitude

Answer 4

small crystals, slow screen, more detail, low grain, more radiation, slow speed

Question 5

narrow latitude

Answer 5

large crystals, fast screen, less detail, high grain, less radiation, fast speed

Question 6

four layers of intensifying screens

Answer 6

base, reflective, phosphor, protective

Question 7

purpose of intensifying screens

Answer 7

aids in converting the xrays to light after they have penetrated patient

Question 8

Calcium tungstate (quality, light produced, color)

Answer 8

emits blue. turns green

Question 9

rare earth (quality, light produced, color)

Answer 9

emits green. better. turns purple

Question 10

photo imprinting is

Answer 10

embedded on film

Question 11

photo imprinting occurs…

Answer 11

before processing and after radiation exposure

Question 12

cassette holds

Answer 12

film

Question 13

intensifying screen is found

Answer 13

inside the cassette

Question 14

the front of the cassette and back are what colors

Answer 14

front- black

back- blue

Question 15

xrays cannot penetrate …

Answer 15

lead

Question 16

when the xrays hit the film- turns

Answer 16

black

Question 17

if no xrays hit the film.. turns

Answer 17

white or clear

Question 18

intensifying screens are light dependent upon what components

Answer 18

phosphor

Question 19

calcium tungstate and rare earth emulsions

Answer 19

Ca Tungstate- 30-40%

rare earth- 50-60%

Question 20

film has what resolution

Answer 20

infinite

Question 21

made of plastic/polymer, indestructible

Answer 21

base layer

Question 22

reflects light emitted by phosphor layer back towards the xray film

Answer 22

reflective layer

Question 23

converts the absorbed xrays to light, calcium tungstate & rare earth

Answer 23

phosphor layer

Question 24

clear coating on the outer surface of the screen, protects phosphor layer and reduces static.

Answer 24

protective layer

Question 25

which screen speeds are used in vet med

Answer 25

medium and regular

Question 26

slow screens require more

Answer 26

radiation

Question 27

small crystals creates more

Answer 27

concentrated

Question 28

which screens have thick emulsions

Answer 28

fast screen

Question 29

two types of luminescence

Answer 29

fluorescence, phosphorescence

Question 30

composition of xray film

Answer 30

base, adhesive, emulsion, supercoat

Question 31

high quality gelatin that is translucent. contains 3 crystals that we call silver halide

Answer 31

emulsion

Question 32

the exposure range over which acceptable densities are produced

Answer 32

film latitude

Question 33

accepts variations in exposure factors or processing without a major change in density

Answer 33

wide latitude

Question 34

storing film near formalin, h2o2, ammonia, or radiation will cause

Answer 34

film fog