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CCD AND CMOS IMAGE CAPTURE EXAM LATEST UPDATED
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CCD AND CMOS IMAGE CAPTURE EXAM LATEST UPDATED...
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CCD AND CMOS IMAGE CAPTURE EXAMLATEST UPDATED
What is the definition of indirect capture digital imaging? - ANSWER A DR unit's
IR turns incoming X-rays directly into light by employing a CCD or CMOS.
What is the oldest indirect conversion digital radiography system used to capture
digital images? - Answer: Charge-Coupled Devices (CCD).
How does a CCD work? - ANSWER: Small capacitors convert light into an
electrical charge; the charge is stored in a sequential sequence and released line by
line before being delivered to an ADC.
Who designed CMOS systems? NASA's ANSWER
How does CMOS work? - ANSWER: C-rays are turned into light photons and
stored in capacitors; each pixel has its amplifier that converts the light photons into
electrical charges.
What are the underlying principles of CCD and CMOS technology? - ANSWER
arrays of light-sensitive pixels that collect photons of light and turn them into a
viewable image
What do the two types of sensors accomplish? - ANSWER: turning light into
electrical signals.
What substance is the chip in a CCD made of? - Answer: silicon.
What occurs when incident light from a scintillator hits a detector? - ANSWER
electron-hole pairs are formed in silicon.
, (The number of electron-hole pairs is proportional to the amount of light absorbed).
What are the three layers on a silicon chip? - ANSWER 1. The polysilicon layer is
covered with a photosensitive substance and contains the electron gates.
2. Silicon dioxide layer (insulator).
3. Silicon substrate contains the charge storage area.
How many electrodes do each pixel have? - Answer three.
What creates this blooming effect? - ANSWER OVERFILLING OF DELS
It is not feasible to build a CCD chip larger than ___ x ___ - ANSWER 5 x 5 cm
Most CCDs range from ____ - ____ cm (answer 2-4 cm).
The scintillator's construction determines: - How many incident x-ray photons are
absorbed?
quantity of light produced
The wavelength or color of light
There are two primary forms of phosphors: ANSWER structured
unstructured
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