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Chapter 6 CCD f questions and answers certified 2024
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Chapter 6 CCD f questions and answers certified 2024
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Chapter 6 CCD/CMOS Image captureCharge-coupled divice (CCD)
Device that acts like a camera in an indirect conversion detector.
The oldest indirect conversion digital radiography systems used what to
acquire the digital image?
CCDs
Overall process of acquiring an image with a CCD?
-the X-ray photons interact with a scintillation material and the light signal is
transmitted by lenses or fiber optics to the CCD
- During Transmission Process:
-the lenses reduce the size of the projected visible light image and
-transfers the image to one or more small capacitors
-the capacitors convert the light into an electrical charge
-this charge is stored in a sequential pattern and released line by line and sent
to and ADC
,When the incident light from the scintillator strikes the detector what is
produced in the silicon?
electron/hole pairs
The number of electron/hole pairs produced is related to what?
the amount of light that is absorbed
What are the 3 layers of the CCD chip?
1. polysilicon layer
2. silicon dioxide layer
3. silicon substrate layer
Polysilicon layer of CCD
coated with a photosensitive material and contains the electronic gates
(opened and closed at read out and release the electrons)
, Silicon dioxide layer of CCD
an insulator
Silicon substrate layer of CCD
contains the charge storage area
Detector element
also called a pixel or del in the CCD
The del contains three ______ that hold the electrons in an _________?
electrodes; electrical potential well
The dels are formed by what that open and close at readout to allow the flow
of electrons?
voltage gates
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