Lec 8 - Detection Flashcards
film has x ray interaction with blank
silver halide crystals
advantage of double sided film
x ray interaction with film occurs more quickly
duplicating film is blank film
single sided
emulsion layers of film detector are made of blank
gelatin/silver halide crystals
larger crystal size =
faster, grainier image
disadvantage of slower film
more x ray exposure to patient because it’s slower
read word document on blackboard
ok
silver halide is drawn toward blank
electrons
screen film has x ray interaction with film and with blank
phosphor screen
screen film use blank fluorescence which boosts x ray detection by film
real time
screen film is blank sided
double
screen film is used for these radiographs
pano, cephalometric
screen film is not a blank technique
digitial
direct exposure film
nonscreen film
screen film is blank exposure film and has blank x ray exposure to the patient
indirect, reduced
type of digital detector used at dental school
PSP (photostimulable phosphor)
psp has x ray interacting with this only which is different from screen film
phosphor
digital x ray has blank exposure time compared to film
1/4
PSP are the blank digital sensors
cheapest
psp detector is recycled by being exposed to blank
a really bright light
light emitted immediately from the phosphor
fluorescence
light emitted later, because most of the photoelectrons are trapped in the phosphor
phosphorescence
three types of digital radiograph detectors
psp, ccd, cmos
ccd and cmos have xray interaction with silicon chip which causes electrons to be captured in blank
conduction band
