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Ch 6 CCD a questions and answers verified 2024
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Ch 6 CCD a questions and answers verified 2024
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Ch 6 CCDWhat is the oldest indirect- conversion digital rad system used
CCDs
CCD (charge-coupled device)
x-ray photons interact w scinitilation material ------> signal is transmitted by
lenses or fiber optics
CCD (charge-coupled device)
What happens during transmission process?
lenses reduce size of the visible image
CCD (charge-coupled device)
During transmission process once lenses reduce the size of the visible image
what happens to the image
transfers image to small capacitors( convert light into an electrical charge
CCD (charge-coupled device)
,During transmission process once lenses reduce the size of the visible image
and transfered image is sent to capacitors( convert light into an electrical
charge
What happens next
it is read out in a sequential pattern and released line & sent to ADC
A CCD (Charge Coupled Device)
CCD's consist of
thousand of light sensitive cells
CCD (charge-coupled device)
Light sensitive cells or pixels produce electric charge proportional to the
___________
amount of light received
CCD (charge-coupled device)
How are pixels arranged (structure wise) in CCD
arranged in a linear array or 2-D grid
, CCD (charge-coupled device)
CCD charge is transported across chips & read at corner of array. ADC then
converts pixels into digital value
CCD (charge-coupled device)
Structure and Function
What is the structure
photosensitive receptor and electronics embedded into a substrate material in
a silicon chip made up of a CCD
CCD (charge-coupled device)
Structure and Function
When the scintillators incident light strikes detector then ----->
electron/hole pairs are produced in the silicon.
CCD (charge-coupled device)
Structure and Function
Number of electron hole pairs directly related to _____________
amount of light that is absorbed
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