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Chapter 6: CCD/CMOS Image Capture with 100% correct answers
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Chapter 6: CCD/CMOS Image Capture with 100% correct answers
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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
Reducing the image size involves several components (3) that contribute to the quality of the image -
correct answer ✔✔scintillator, light collection component, noise
The type of scintillator and way it is constructed will determine - correct answer ✔✔How many incident
x-ray photons are absorbed, how much light is produced, wavelength or color of the light
2 main types of phosphors - correct answer ✔✔Structured, unstructured
Structured phosphor - correct answer ✔✔Cesium Iodide
Cesium iodide is considered structured because of its - correct answer ✔✔Needle-like crystals
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