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VTI: Image Receptors Chapter 6
Radioraphy Chapter 6 pg 59-72
30
Veterinary Medicine
Undergraduate 3
03/29/2011

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Term
The tendency of a luminescent compound to continue to give off light after x-radiation has stopped.
Definition
Afterglow
Term
A transparent flexible polyester support layer of radiographic film
Definition
Base
Term
A lightproof encasement designed to hold x-ray film and intensifying screens in close contact.
Definition
Cassette
Term
A layer of radiographic film made of gelatin containing suspended silver halide crystals
Definition
Emulsion
Term
The exposure range of a film that will produce acceptable densities
Definition
Film latitude
Term
A special radiographic diagnostic method by which a "live view" of the internal anatomy is possible
Definition
Fluoroscopy
Term
Sheets of luminescent phosphor crystals bound together and mounted on a cardboard or plastic base
Definition
Intensifying screens
Term
An invisible image on the x-ray film after it is exposed to ionizing radiation or light before processing
Definition
Latent image
Term
Film that is more sensitive to ionizing radiation than to fluorescent light
Definition
Nonscreen film
Term
An artifact of faster screens that results in density variation due to random spatial distribution of the phosphor crystals within the screen
Definition
Quantum mottle
Term
A layer of an intensifying screen that reflects the light from the phosphor layer toward the film
Definition
Reflective layer
Term
Film with silver crystals that is more sensitive to fluorescent light emitted form intensifying screens than to ionizing radiation
Definition
Screen film
Term
A compound of silver and bromine, chlorine, or iodine, all of which are in the halogen group of elements
Definition
Silver halide
Term
A clear protective layer on radiographic film
Definition
Supercoat
Term
How often should screens be cleaned
Definition
once a month
Term
What is material can the front of a cassette be made of?
Definition
Aluminum, polycarbonate, magnesium and carbon fiber
Term
The back of a cassette is lined with this material to help in prevention of backscatter which would cause fogging of the film
Definition
Lead
Term
The area marked in the corner of the cassette front to indicate the prescence of a lead blocker is approximately what in measurement?
Definition
3 x 7 cm
Term
Inside the cassette, both sides can be lined with what material to ensure close contact of the film and screens?
Definition
Felt or Foam Pressure Pads
Term
How many intensifying screens are normally inside the cassette to sandwhich the x-ray film?
Definition
2
Term
Over 95% of the exposure to film is due to:
Definition
Light emitted form the intensifying screens
Term
What layers make up intensifying screens?
Definition
  • Base or support
  • Reflective layer
  • Phosphor crystal layer
  • Protective coat
Term
Rare-earth phosphors fall in the___light part of the spectrum.
Definition

Green

 

 

Note: Calcium Tungastate falls under the blue light part of the spectrum

Term

True or False

 

The light conversion of rare-earth screen is four times as great as that of calcium tungstate screen.

Definition
True
Term

True or False

 

Within certain limits, the larger the crystals the greater its light emulsion resulting in less x-radiation necessary to expose the x-ray film

Definition
True
Term
In radiography, screen speed is inversely proportional to the exposure required to produce a given effect. So if a fast screen requires a small exposure a slow screen requires _____.
Definition
A Larger Exposure
Term
An invisible image on a film after exposure to xrays and before developing due to silver halide crystals in the film absorbing x-rays and splitting apart
Definition

Latent Image

 

Note:Partially split crystals convert and turn black unecposed crystals are cleared away from the film in the fixer

Term
What is the most common versatile speed?
Definition
300-400 speed (medium speed)
Term

True or False

 

Screened film has greater detail then non-screen film

Definition
False
Term
Film care/storgae: The film should be held vertically kept in a cool place (50-59°F) and should be kept at low humidity (____).
Definition
40-60%
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