Relative number that describes how efficiently x-rays are converted to light.
What is speed
100
The two types of resolution are _______ and _________.
What is spatial and contrast
100
Phosphors require a _________ atomic number to increase the probability of incident photon interaction.
What is high (57-71)
100
Grainy image from insufficient light emission.
What is quantum mottle
200
Screen layer closest to the film, shields phosphors from damage.
What is protective coating
200
Screen speed ranges from ____ to _____.
What is 50-1200
200
How small an object can be imaged.
What is spatial resolution
200
___________ refers to both the sensitivity of the film and light emission of the screen.
What is spectral matching
200
DQE stands for __________.
What is Detective quantum efficiency.
300
Active layer of the intensifying screen.
What is phosphor layer
300
Intensification factor (IF) is defined as:
What is the magnitude of dose reduction when using an intensifying screen.
300
The ability to image similar tissues.
What is contrast resolution
300
True or false: Calcium tungstate screens are faster than rare Earth screens.
What is false
300
True or false: Image noise increases with higher CE but not higher DQE.
What is true
400
Support layer of the intensifying screen; must be flexible, semi-rigid, and uniformly translucent.
What is base layer
400
Three screen characteristics are ________, ________, and _________.
What is Intensification factor (IF) (speed), image noise, and spatial resolution
400
Phosphor crystal size and layer thickness are __________ related to resolution and _________ related to screen speed.
What is inversely, directly
400
Current type of phosphors used in radiographic intensifying screens.
What is rare earth screens (gadolinium, yytrium, lanthanum)
400
The amount of light emitted for each x-ray absorbed.
What is conversion efficiency
500
Screen layer made of magnesium oxide or titanium dioxide; enhances the efficiency of the intensifying screen.
What is reflective layer
500
Three factors that determine screen speed.
What is phosphor size, thickness of the phosphor layer, and concentration of phosphors.
500
The _________ the screen speed, __________ the spatial resolution, _________ image blur.
What is faster, lower, increased
500
___________ refers to the ability of a material to emit light when stimulated. _________ is a delayed emission, _________ occurs only during phosphor stimulation.
What is luminescence, phosphorescence, fluorescence.