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Chapter 6 CCD/CMOS digital fully solved rated A+
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Chapter 6 CCD/CMOS digital fully solved rated A+
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Chapter 6 CCD/CMOS digitalthe 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
most chips range from _ to _ cm - correct answer ✔✔2-4
the image has to be matched to the size of the CCD, which implies that the image must be _________ in
size - correct answer ✔✔reduced
CCD technology uses ____________ or _______________ so that the image matches the receptor size -
correct answer ✔✔lenses or fiber optics
the type of scintillator and the way it is constructed will determine how much of the incident xray
photons are ___________ , how much light is produced and the wavelength or color of the light - correct
answer ✔✔absorbed
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