Ira Week 2 - Week Quiz (221) Flashcards
What is the purpose of aluminum in cassette ?
Absorbs scatter
Purpose of felt material?
Helps w/ static
What layer traps electrons
Active layer.
What happens in color layer?
Absorbs I reflective light.
Reflective color layer reflects light where?
Forward
Why barcode on cassettes?
Identifies patient.
Specific phosphor?
Barium fluoride.
Electrons get absorbed
In what layer
Phosphor layer.
Layer beam reads cassette (in raster) what’s happening to atoms?
Bombarding each other
What way are photons traveling
Traveling in same direction
How often is cassette used
50 cassettes per hour
Digitization what happens
Photons getting assigned #’s (being translated)
How does layer scan cassette?
, In raster pattern
What determines PSP resolution.(3)
A pixel, # of pixels and how thick phosphor layer
How to erase image?
Flashbange ( flush w/light)
What can happen if we select wrong body type?
Misinteriptation
Key/main word refers to k.v.p
Penetration
Range for k.e.v (k-edge)?
30 - 50 K.E.V.
Mas=
Think of #of electrons
What happens w/not enough light?
Grainy image
High # of pixel does what to an image resolution
High resolution
Grid used for PSP than film why?
Density (more)
Grid terms (3) - r, f, & F.
Ratio-height /space
Frequency- more lines
Focus-central beam
The range for k.v.p that can be used with PSP system is
45-120
