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WorksheetsIMRC 182 - LO6 Review
Total questions: 15
Worksheet time: 8mins
What is the conversion efficiency for calcium tungstate intensifying screens?
3%
5%
15-20%
20-33%
True or False: A calculated MTF can be 1.0 or greater.
True
False
Poor film/screen contact will result in ___________.
decreased contrast
increased contrast
decreased resolution
increased resolution
True or False: Intensifying screen phosphors should have a high atomic number.
True
False
Which term describes delayed light emission/afterglow?
Luminescence
Phosphoresence
Fluorescence
Which is the best measurement of the resolving ability of a film/screen combination?
Line Pairs per Millimeter
Line Spread Function
Modulation Transfer Function
True or False: To eliminate quantum mottle we must increase kVp.
True
False
Which intensifying screen layer is the active layer capable of emitting light?
base
reflective layer
phosphor layer
protective coating
True or False: Using an intensifying screen that has a higher conversion efficiency will reduce patient dose.
True
False
Line spread function is:
the ability to measure boundaries of an image
measurement of the information lost between the subject and IR
the minimum size and space between objections that can be visualized
a measure of relative speed and resolution
A high speed screen should be able to demonstrate __________.
7 lp/mm
10 lp/mm
15 lp/mm
100 lp/mm
True or False: Intensifying screens should produce maximum phosphorescence and minimum fluorescence.
True
False
What is the purpose of an intensifying screen?
convert x-ray energy to chemical energy
reduce quantum mottle
convert x-ray energy into light energy
decrease buildup of static electricity
True or False: When unloading cassettes, they should be opened 2-3 inches to prevent accumulation of dust and condensation.
True
False
Which item is NOT a part of the x-ray cassette?
foam pressure pad
lead foil backing
plastic back
metal front
