Imaging unit 5

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photosensitive film is used in what?

Photography
Photosensitive film used in photography responds to what?

Exposure from photons
Visible light and x-rays are used in what?

Photosensitive film(used in photography)
What is possible with photosensitive film that's used in photography?

It is possible to make film insensitive to portions of the spectrum
how is how is radiographic film constructed? (From the inside out)
- base
- adhesive layer
- emulsion
- supercoat(overcoat)
What is important about the foundation of radiographic film?
- Flexible yet durable
- uniformaly radiolucent
- film must retain size and shape throughout use and processing
- thickness ranges from 150-200 micrometers
- modern base is thin sheets of polyester
What is the thickness range of radiographic film?

150-200 micrometers
What was the original base that was used to create radiographic images?

Glass plates
What were glass plates coated with? Tell about its maintenance.
- Emulsion
- maintanance of the glass plates were difficult
The exposure factors of glass plates were_______________.

Very high
What caused the glass plates to be replaced with cellulose nitrate?

Shortage in glass from WWI
What kind of base was used in the 1920's and 1930's? Why did it not last?
- Cellulose nitrate
- highly flammable- led to several devastating hospital fires
In the 1920's what base was introduced?

Cellulose triacetate
what was flammable as an equal thickness of paper?

Cellulose triacetate
What were the disadvantages of cellulose triacetate?
- Films would warp with age
- not as resilent as today's polyester films
What is today's base made of and when was it introduced?
- Polyester
- 1960's
What are the specializations of film base?
- Blue tint
- Crossover
- halation
Blue tint reduces ___________ and increases __________.
- reduces eyestrain
- increases diagnostic accuracy
What is crossover?

Light from one screen exposed to the opposite emulsion

Author

ashleyfoster

183046

Card Set

Imaging unit 5

Description

Unit 5

Updated

2012-11-12T01:31:31Z

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