X-ray Film Flashcards Preview

Radiography > X-ray Film > Flashcards

Flashcards in X-ray Film Deck (10)
Loading flashcards...
1

Construction of film

Sheet of cellulose acetate covered by layer of emulsion
Layer of clear gelatine protects emulsion and binds it to acetate
Emulsion contains silver halide granules (silver bromide)

2

How do x-rays affect silver halide granules

Cause chemical reaction in granules
Reactions decreases with higher tissue density

3

Define latent image

Exposed but not processed

4

Define screen film

Must be used in cassette with intensifying screens
Film speed increases with granule size
Increased speed leads to short exposure and development times
- Loss of definition

5

Define non-screen film

Contained in light-tight envelopes
Used for higher definition where cassette impractical (dental)
Require longer exposure and development time

6

Define film-screen speed

Relates to exposure req. for given degree of blackening

7

What can be a result of poor film-screen contact

Image blurring

8

What should labelling be and include

Permanent

ID name +/- number
Date
R/L marker

9

Labelling req. for hip dysplasia scheme

Must be done prior to processing

KC reg. number
- alternative ID if not registered
Microchip no.
Date
R/L marker

10

Labelling prior to exposure methods (2)
Labelling in darkroom method (1)
Labelling post-processing (1)

Graphite tape
Lead letters

Light marker prior to processing on unexposed corner

White chinagraph pencil