Producing an X-Ray Flashcards
Single emulsion film is most commonly used in vet med following which procedure?
MRI/CT
What is the benefit of screened film over non-screened?
decrease in exposure time
Which phosphor is most commonly used in blue sensitive film?
Ca tungstate
Film with larger crystals will be
faster, less detailed.
non-screened film is commonly used
in dental images
What are double emulsion films?
have a protective coat on both sides
What is the film emulsion layer made up of?
silver halide crystals.
What is the latent image?
The image on a piece of film after exposure, but can’t be seen before development.
What affects film speed and what are the ratings?
- size of the silver halide crystals.
- high-speed, average speed (par), and slow (detailed).
The pH of the fixer chemical is
acidic
most states have a requirement to trap elemental silver from which chemicals after processing?
fixative
What stage removes silver halide crystals
fixer stage
how far away should safelights be from the work area
4 feet
What is the correct wattage for a safelight bulb
7-10 watts
what is the pH of the developer
strong alkaline
What is the restraining agent used in developer
potassium bromide
what causes a silver halide black tree pattern artifact
static electricity during handling
What are the components of the developer
developing agent, activator, restrainer, preservative, hardener, and solvent
What to kV and mA control?
kV - penetrating power
mA - density of the film
contrast is dependent on
increase or decrease in mA and time
what corrections must be made if the film is too dark?
decrease mAs 30-50%
what correct must be made if the film is too light?
increase kVp 10-15%
When taking rads of the extremities, the contrast should be?
high contrast
What are the guidelines for incremental changes when adjusting mAs and kVp?
kVp changed 10%-15%, mAs 30-50%
What is the best example on contrast from least to most dense?
gas, fat, fluid, bone, metal.
What happens if the xray tube is moved closer to the table than the technique chart is designed for?
the film will come out too dark.
What four areas are evaluated to determine rad quality?
film contrast, density of the image, proper positioning, labeling.
What are the components of the fixer
fixing agent, acidifier, preservative, hardener, and solvent
