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Chapter 6 CCD. questions and answers already passed 2024
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Chapter 6 CCD. questions and answers already passed 2024
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Chapter 6 CCD / CMOS Image CaptureCharge-coupled devices - correct answer ✔The oldest indirect conversion
digital radiography system used to acquire a digital image
CCD - correct answer ✔X-ray photons interact with a scintillation material,
and the light is transmitted by lenses or fiber optics
- light converted to electricity, where it is stored in capacitors
- Charge = released line by line, & sent to ADC
CCD structure & function - correct answer ✔- light sensitive silicon chip
- Light from scintillator hits chip, & electron-hole pairs are produced (light to
energy conversion)
- Electrons = held in silicon until charge is read out to form the image
Light - correct answer ✔In CCD, the amount of electron-hole pairs is
released to the amount of __________ absorbed.
Readout - correct answer ✔In CCD, electrons are held in a well until when?
An electrical potential well - correct answer ✔In CCD, where are the
electrons held on the detector element?
Bucket brigade scheme - correct answer ✔Voltage gates are opened &
closed at readout to allow the flow of electrons. Electricity is flowing and
image formation is being sent from the detector (1 line at a time) to the ADC
then on to the comp. workstation
, Readout - correct answer ✔Bucket brigade scheme is also known as what?
Very quickly - correct answer ✔Bucket brigade scheme (readout) requires
that the movement of the electrons be carefully timed. This process occurs:
Blooming effect - correct answer ✔Overfull of the DELs will cause what?
Adjacent - correct answer ✔Excess electrons spill out of the DEL into an
__________________ DEL.
Overflow drains - correct answer ✔What are built into the detector to prevent
blooming?
How many incident x-ray photons are absorbed, amount of light produced by
scintillator, wavelength - correct answer ✔The scintillator and the way it is
constructed will determine:
2, Structured & unstructured (turbid) - correct answer ✔How many main
types of scintillators are there? and what are they?
Light - correct answer ✔Scintillators always produce what?
CsI - correct answer ✔Is considered structured (needle-like crystals)
Gd2O2S - correct answer ✔Is considered unstructured (powder-like grains)
Critical contributors - correct answer ✔The optics in a CCD are
______________ _________________ to the quality of the digital image
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