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Ch8. questions and answers verified 2024
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Ch8. questions and answers verified 2024
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Ch. 6 CCD/CMOS Image captureCharge-coupled divice (CCD) - correct answer ✔a photosensitive receptor
and electronics embedded into a substrate material in a silicon chip
The oldest indirect conversion digital radiography systems used what to
acquire the digital image? - correct answer ✔CCDs
Overall process of acquiring an image with a CCD? - correct answer ✔-the
X-ray photons interact with a scintillation material and the light signal is
transmitted by lenses or fiber optics to the CCD
-the lenses reduce the size of the projected visible light image and transfer the
image to one or more small capacitors
-the capacitors convert the light into an electrical charge
-this charge is stored in a sequential pattern and released line by line and sent
to and ADC
When the incident light from the scintillator strikes the detector what is
produced in the silicon? - correct answer ✔electron/hole pairs
The number of electron/hole pairs produced is related to what? - correct
answer ✔the amount of light that is absorbed
After the electrons are produced, what are they held by in the array? - correct
answer ✔electrostatic forces
What are the 3 layers of the CCD chip? - correct answer ✔1. polysilicon
layer
2. silicon dioxide layer
, 3. silicon substrate layer
Polysilicon layer of CCD - correct answer ✔coated with a photosensitive
material and contains the electronic gates (opened and closed at read out and
release the electrons)
Silicon dioxide layer of CCD - correct answer ✔an insulator
Silicon substrate layer of CCD - correct answer ✔contains the charge
storage area
Detector element - correct answer ✔also called a pixel or del in the CCD
The del contains three ______ that hold the electrons in an _________? -
correct answer ✔electrodes; electrical potential well
The dels are formed by what that open and close at readout to allow the flow
of electrons? - correct answer ✔voltage gates
How is the electric charge collected (gathered to be read) on the silicon chips?
- correct answer ✔the voltage sign is changed on the electrodes within each
del, moving the electrons by rows down the columns until the readout row is
reached
Bucket brigade scheme - correct answer ✔process of electron movement
during the image processing; voltage gates within detector elements are
closed, allowing electrons to flow by rows and down by columns to readout
row
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