radiosensitive material that receives the remnant beam and forms an image of the body part
Image Receptor
invisible image contained in film prior to processing
Latent Image
can be seen in film after processing
Manifest or Visible Image
emits light only when stimulated
Fluorescence
provides a dynamic (moving) image such as a patient swallowing barium sulfate.
Fluoroscopy
decrease in useful beam as it is partially absorbed by body part
Attenuation
radiation remaining after passing through the body part – strikes the image receptor and forms the image
Remnant Radiation
continues to emit light after stimulation
Phosphorescence
The purpose of intensifying screens is to ________________ the amount of exposure required to produce an
image.
decrease
When using intensifying screens, _____% of the image is actually formed by light from the intensifying
screens striking the film.
99%
Screen __________ refers to how efficiently the screen converts x-ray energy to light energy. As screen
speed increases, the number of x-rays needed to produce adequate density ______________.
speed;decreases
Higher speed screens are made by using a thicker _________________ and an increase in __________ size.
phosphor layer; crystal
A 100 speed screen is ___________(faster/slower) than a 400 speed screen. If 20 mAs is required using a 100 speed screen, __________ mAs is required using a 400 speed screen to produce an equal film density.
slower; 5 mAs
The ______________________ test is used to monitor screen film contact.
wire mesh
A layer of lead foil may be found in the back of a cassette to prevent _____________ from fogging the film.
backscatter
Pairing a green-light emitting screen phosphor with a film sensitive to green light is termed _____________________.
spectral matching
__________________________ are unwanted marks or images appearing on a radiograph.
artifacts
Film emulsion is composed of __________________________ suspended in _________________.
silver halide crystals; gelatin
_____19. Using a higher speed screen and decreased mAs results in
D.
Which of the following is NOT a purpose of the film cassette?
C.
Poor film-screen contact results in:
D.
Refers to the property of a film which allows a large range of exposures that result in useful film density.
Wide Latitude
Refers to matching the color sensitivity of x-ray film to the color of light emitted by the intensifying screen.
Spectral matching
Refers to the practice of using the oldest film on the shelf first.