Fluoro Flashcards
define a dexel
detector element
what does a detector element/dexel consist of
TFT - thin film transistor
capacitor
transistor
photodiode
role of TFT
receives xray signal
role of capacitor
accumulates and stores the signal as electric charge
role of transistor
serves as a switch
role of photodiode
converts light into charge
what is fluoroscopy
- real time imaging
- uses xray technology to view the movement of internal structures
what are the components of a fluoroscop
pt table
xray tube
flat panel image detector
computer viewing station
what does the flat panel image detector replace
image intensifiers and film
fluoro uses low doses per frame what does this result in
- significant quantum noise and ultimately poor statistical integrity/low SNR
- this limits the ability to see small objects
what is AERC and what is it usually used in
- automatic exposure control
- used with continuous fluoro
what does AERC do and how does it do that
- keeps SNR constant
- regulates xray exposure rate incident on the input phosphor of the flat panel detector
- AERC sensor will send signals to the xray generator if an increase or decrease in exposure is needed
what is the SNR
ratio between the signal photons and the noise photons
