Sciences Unit 5 SG Flashcards
Phosphors used in CR
Photostimulable
Phosphors used in DR
Amorphus selenia
Phosphors used in indirect DR
Amorphus silicon
What is used to scan the CR IP in the reader
Helium-neon laser
During IP scanning in the reader, energy is relased in the form of
Light
What converts an electronic (analog) signal into a digital signal
ADC
Purpose of a scintillator and what is it made of
Absorbs photons and gives off light
cesium iodide
Which IR phosphor provides best resolution
Why
Needle
Less light divergence
What is a DEL
Pixel in a matrix basically
Define artifact
anything on a film that is unwanted opening cassette in light dust heat chemicals scratches emulsion
Define duplitized film. What is the advantage
emulsion on both sides of film
decreased mas
What type of phosophors are contained in film emulsion
Silver bromide
silver iodide
What type of EM energies is film sensitive to
visible light
xray
radio waves/microwaves
not sensitive
Define “latent” and “manifest”
latent cannot see, image before processing
Manifest is visible one we can see
Purpose of gelatin in emuslion layer
suspends and separates silver crystals
film storage critera
on end 30-60% humidity less than 68° in dark room away from artifacts
define photosensitive
responds to any kind of photon
legal requirements for image ID
Exposure date pt full name pt ID # Institution Anatomical side marker
Active layer of film is called
emulsion
Define absorption
how well it absorbs xray
define conversion efficiency
ability to change xray to whatever we want it to be converted to (other form of energy)
Overall purpose of film processing
make the image visible
Purpose of developer and fixer
coverts silver bromide to bms
stops action of developer
unexposed silver is removed
Four steps of processing in order
developing
fix
wash
dry
why is draining wash tank important
prevent algae growth
five systems of an automatic processing unit
transport dryer replenishment recirculation temp control
