143 quiz 1 Questions with complete solution 2024/2025
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Course
AGN 143
Institution
AGN 143
143 quiz 1 Questions with complete solution 2024/2025 143 quiz 1
what is the active layer in a direct detector imaging plate? - correct answer amorphous selenium
what is a direct detector? - correct answer uses amorphous selenium and a thin film transistor to convert incoming x-ray photo...
143 quiz 1
what is the active layer in a direct detector imaging plate? - correct answer
✔amorphous selenium
what is a direct detector? - correct answer ✔uses amorphous selenium and
a thin film transistor to convert incoming x-ray photons to an electronic digital
signal
how is the image formed in direct radiography - correct answer ✔-before
exposure, a high voltage charge is applied from the top surface of the
selenium layer
-the ionization caused by the x-ray photons results in the selenium atoms
freeing electrons for collection by the electrodes at the bottom of the selenium
layer
-charges are collected at a TFT and read line by line to the computer for
processing
what do indirect detectors need that direct detectors do not? why? - correct
answer ✔scintillator to change the photons into light
TFT (what does it do) - correct answer ✔-thin film transistor
-collects the electric charges produced by either the selenium or silicon as an
array or matrix of pixel size detector elements
what does DEL stand for? - correct answer ✔detector element
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