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Chapter21a questions and answers certified 2024
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Chapter21a questions and answers certified 2024
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Chapter 6: CCD/CMOS Image CaptureA device that acts like a camera in an indirect conversion detector is known as
a: - correct answer ✔Charged Coupled Device
The oldest indirect conversion digital radiography system used _________ to
acquire a digital image - correct answer ✔Charged Coupled Device
In a CCD system what happens? - correct answer ✔X ray photons interact
with a scintillation material, then the signal is transmitted by lenses or fiber
optics to the CCD
During the transmission process, lenses ______ the size of the projected
visible light image and transfers the image to one or more small _______ that
__________ the light into an __________ and ________. This charge is then
stored and sent to an _______ - correct answer ✔reduce, capacitors,
convert, electrical signal, store it, ADC
The amount of electron-hole pants is related to the the - correct answer
✔amount of light absorbed
The chip of the CCD is made up of what 3 layers? - correct answer
✔Polysilicon layer, silicon dioxide layer, silicon substrate
Coated in a photosensitive material and contains the electron gates in the chip
- correct answer ✔Polysilicon layer
Insulator in the chip - correct answer ✔Silicon dioxide layer
, Contains the charge storage area in the chip - correct answer ✔Silicon
substrate
Each pixel or detector element (del) contains what? - correct answer ✔3
electrodes that hold the electrons in an electrical potential well
Formed by voltage gates that are opened and closed like gates to allow the
flow of electrons - correct answer ✔Dels
Process of electron movement during image processing; voltage gates within
the detector elements are closed, allowing electrons to flow by rows and down
by columns to readout row. - correct answer ✔Bucket brigade scheme
The readout process requires that _______ and _______. - correct answer
✔the flow of electrons is timed; multiple voltage changes occur
Because of the high cost of a CCD chip, it is not practical to manufacture a
CCD chip larger than - correct answer ✔5 cm X 5 cm
Most CCD chips range from - correct answer ✔2-4 cm
Image must be _____ in size to match the size of the CCD - correct answer
✔Reduced
CCD uses ______ or ______ so that the image matches the receptor size -
correct answer ✔Lenses, fiber optics
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