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Chapter 6 CCD g questions and answers already certified 2024
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Chapter 6 CCD g questions and answers already certified 2024
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Chapter 6 CCD/CMOS Image Capture (?)the oldest indirect-conversion digital radiography systems used
___________________________ to acquire the digital image - correct
answer ✔charge-coupled devices (CCDs)
True or False: In a CCD system, x-ray photons interact with a scintillation
material and the signal is transmitted by lenses or fiber optics to the CCD -
correct answer ✔True
During the transmission process, the lenses ____________ the size of the
projected visible light and transfer the image to one or more small capacitors
that convert light into an electrical charge - correct answer ✔reduce
The charge is stored in a sequential pattern and released ________________
and sent to an analog-to-digital converter (ADC) - correct answer ✔line by
line
a ____________________ receptor and ___________________ embedded
into a substrate material in a silicon chip make up a CCD - correct answer
✔photosensitive, electronics
Incident light from a scintillator strikes the detector and _______________
pairs are produced in the silicon - correct answer ✔electron/hole
True or false: the number of electron/hole pairs is related to the amount of
light absorbed - correct answer ✔true
the electrons are held by ________________ forces int he array until the
charge is readout to form the image - correct answer ✔electrostatic
, the chip is made up of a _____________ layer, a _________________
_______________ layer, and a ______________ _____________ - correct
answer ✔polysilicon, silicon dioxide, and silicon substrate
which layer is coated with a photosensitive material and contains electronic
gates - correct answer ✔polysilicon
which layer is an insulator - correct answer ✔silicon dioxide
which layer contains the charge storage area - correct answer ✔silicon
substrate
each pixel or detector element (del) contains _________ that hold the
electrons in an electrical potential well - correct answer ✔3 electrodes
true or false: the dels are formed by voltage gates that, at readout, are opened
and closed like gates that allow the flow of electrons - correct answer ✔true
the _________ ______________ ________________ is a processed where
you 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 readout row is eached - correct answer ✔bucket brigade scheme
the overflow of electrons in a detector element - correct answer ✔blooming
effect
true or false: it is not practical to produce CCD chips any larger than
5cmX5cm - correct answer ✔true
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