imaging Vocab P2 Flashcards
The time it takes for a biological system to eliminate (through natural processes) half of the amount of a substance (such as radioactive material) that has entered it
biological half life
why would you see white specks on a film?
dust
machine factors for reasons why the film would be too light also known as
under exposure (too low mAs or Kvp)
Drop in incoming line voltage
equipment malfunction
film being too light
Decreased film density
physical factors for why film is too light aka ____
Under measurement of anatomical part
Increased subject density
Source-image distance (SID) too great
Grid usedPositive contrast media used
Slow speed screen/film used
Cassette not positioned in Bucky tray properly
Bucky tray not positioned directly under primary beam
Processing factors,(wet tank) for why film is too light
Under development
Developer time too short
Developer temperature to low
Exhausted developer
Contaminated developer
Diluted developer
Defective thermometer resulting in incorrect temperature reading
Dev. Improperly mixed
Automatic processors factors for filming too light
Under replenishment
Developer temperature too low
Exhausted developer
Improperly mixed developer
film too dark
Increased film density
Machine factors for film, being too dark also known as_______
Surge in incoming line voltage
Overexposure, too high MAs or kvp
Equipment malfunction
Physical factors for film, being too dark
over measurement of anatomical part
Decreased subject density
Negative contrast media used
Fast speed, screen/film.
No grid
SID too short
processing(wet tank) factors for film, being too dark
Overdevelopment
Developer time too long
Developer temperature too high
Inaccurate thermometer resulting in higher temperature reading
Solutions too concentrated
Bromide missing from developer
defective thermometer
Automatic processor factors for film too dark
Rollers malfunctioning
Light Leak from cover or in dark room
Over replenishment
Developer temperature too high
How to prevent kissing defect
Make sure films are dry and not touching
Preventing film fog
Make sure there are no light leaks
