8.2 Film Processing 2 Flashcards
• Special curved plates made of either plastic or metal are
positioned at the sides and bottom of the master roller
and are called
guide shoes
support the transport rollers and
turnaround assemblies
Transport Racks
can be removed for cleaning or maintenance
Transport Racks
After the film travels to the top of the transport rack, it
passes between _____ rollers that remove excess
chemicals or water before the film enters the next tank
squeegee
An electric motor and a system of gears,
chains, sprockets, belts and pulleys provide mechanical
power and motion in the transport system
Drive Motor
Any _____ of the components or change in the speed
of the motor causes improper film processing and poor
image quality
slippage
Proper ____ temperature is
required to properly convert the latent image to a manifest image
developer
Variations of greater than _____ from
the temperature recommended by the film
manufacturer will result in a manifest image that either
has too much or too little density
±5 degrees Fahrenheit
controlled by recirculation pumps that
agitate the processing solutions to keep them mixed, to
maintain constant temperature throughout the solutions and to
assist the exposure of the film’s emulsion to the processing
chemicals or water as it passes through the developer, fixer and
wash tanks
Recirculation System
The dryer system consists of:
blower, ventilation ducts, vented
dryer tubes and an exhaust system
draws in room air and passes it over heating coils. The heated air then enters the ventilation ducts and dryer
tubes, and then blows over the surface of the film emerging
from the wash tank
blower
are made of plastic and are hollow.
Small slots that face the film as it travels down and up
through the dryer section are cut into the tubes
dryer tubes
the processor contains electrical
circuits that power its drive motors and temperature
control system
Electrical System
can be defined as the amount of
time required for the leading edge of the film to enter
and the trailing edge of the film to exit the processor
PROCESSING RATE
PROCESSING RATE e is commonly called the
drop time
The total processing rate should not vary more than ____ of the
time specified by the manufacturer
± 2%
Conventional general-purpose automatic processor used
in medical imaging departments today process a
radiographic film in approximately ___
90 seconds
enables film
processing without the need for a conventional
darkroom
DAYLIGHT AUTOMATIC PROCESSORS
that are compatible with the daylight system are used
Special daylight cassettes
DAYLIGHT AUTOMATIC PROCESSOR
1.) Unexposed films or various sizes are stored in a loading
dispenser located within the daylight processor unit.
2.) The cassette is inserted into the processing unit where
the exposed film is automatically removed and a new film
is loaded into the cassette.
3.) The exposed film is transported to the processor
The main advantage of a ______ is increased
departmental efficiency
daylight system
Other advantages: daylight system elimination of the need for a darkroom or trained darkroom personnel
daylight system
• Disadvantages: Mechanical failure and artifacts cause
by mechanical components of the film transport system
daylight system
Another disadvantage: Cost
daylight system
