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Chapter 6 CCD b questions and answers already passed 2024
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Chapter 6 CCD b questions and answers already passed 2024
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Chapter 6 CCD/CMOScharge-coupled devices (CCDS) - correct answer ✔The oldest indirect
conversion digital radiography systems used ________ to acquire the digital
image.
scintillation/ lenses or fiber - correct answer ✔In a CCD system, x-ray
photons interact with a ______ material and the signal is transmitted by _____
or _____ optics to the CCD.
size/ light to electrical charge - correct answer ✔During the transmission
process, the lenses reduce the ____ of the projected visible light image and
transfer the image to one or more small capacitors that convert ______ to
_______.
analog-to-digital converter (ADC) - correct answer ✔This charge is stored in
a sequential pattern and released line by line and sent to an ___________.
photosensitive receptor - correct answer ✔A ___________ and electronics
embedded into a substrate material in a silicon chip make up a CCD.
Incident light - correct answer ✔_________ from a scintillator strikes the
detector and electron/hole pairs are produced in the silicon.
light - correct answer ✔The number of electron/hole pairs is related to the
amount of ______ that is absorbed.
electrostatic forces - correct answer ✔The electrons are held by _______ in
the array until the charge is read out to from the image.
, polysilicon layer, silicon dioxide layer, silicon substrate - correct answer
✔The chip is made up of a ______ layer, _____ layer, and a _____.
polysilicon - correct answer ✔The _______ layer is coated with a
photosensitive material and contains electronic gates.
silicon dioxide/ silicon substrate - correct answer ✔The _______ layer is an
insulator and the _____ contains the charge storage area.
detector element (del) - correct answer ✔Each pixel or _______ contains
three electrodes that hold the electrons in a electrical potential wall.
voltage gates/ electrons - correct answer ✔The dels are formed by _______
that, at readout, are opened and closed like gates to allow the flow of _____.
readout row/ "bucket brigade scheme" - correct answer ✔To collect the
charge on the silicon chips, the voltage sign is changed on the electrodes
within each del, moving the electrons by rows down the columns until the
_______ is reached. This is known as what?
amplifier - correct answer ✔Once the readout row is reached, the data are
sent sequentially to the sense _____ and are then digitized.
electrons - correct answer ✔There can be issues with overfill in the dels,
which causes excessive _____ to spill out of the del into an adjacent del.
"blooming" - correct answer ✔This is handled by building overflow drains into
the array to reduce or prevent this "_____" effect.
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