What layer of the IP traps the electrons during exposure? - ANSWERactive/phospher layer
Why is it necessary to erase the PSP imaging plate periodically? How often? - ANSWERTo avoid ghost images by removing trapped electrons. Erase every 48 hours-1 week minimum
What is the process of shutterin...
RAD 262: CR/PSP Questions & Answers
What layer of the IP traps the electrons during exposure? - ANSWERactive/phospher
layer
Why is it necessary to erase the PSP imaging plate periodically? How often? -
ANSWERTo avoid ghost images by removing trapped electrons. Erase every 48 hours-
1 week minimum
What is the process of shuttering called? What is the purpose? Is it good for pt dose? -
ANSWER"veil glare", to clean up the white along the edges, applied post-processing so
no affect on pt dose.
A grainy or noisy image is due to what? - ANSWERnot enough photons striking the IR.
Increase tech. (mAs)
What is the rate that PSP plates are processed from scanning to erasure in the CR
reader? - ANSWER90 seconds, 50/hr, 45s-90s
What does the reflective layer do in the PSP imaging plate? - ANSWERsends light
forward in layers of IP, helps prevent back scatter and increases image quality
How are PSP imaging plates erased? - ANSWER1. by flooding it with a bright white
light, prevents ghosting
2. electrons lose excitement and return to valence band
What is the range of kVp that are usable typically in CR? - ANSWERcan detect 45-120
kVp, optimal is 60-110 kVp (less that 60 is not recommended)
How is the latent image removed from the PSP imaging plate? - ANSWERlaser (red
helium neon), red solid state laser extracts trapped electrons and excites them from f-
center
What does the mirror do within the CR reader? - ANSWERdeflects (towards IP) and
shapes red laser
What is the pattern called that the laser scans the PSP storage phosphor plate in? -
ANSWERRaster pattern (zig-zag)
The phosphor family that makes up the active phosphors in the CR imaging plate
system is the: - ANSWERBaFlBr (EU+)
What is digitization and what are the steps involved with it? - ANSWER1. PMT
2. Amplification
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