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Chapter 6 Imaging questions well answered to pass
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Chapter 6 Imaging questions well answered to pass
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Chapter 6 ImagingWhat is a CCD? - correct answer ✔✔A charge coupled device is the oldest indirect conversion digital
radiography system used to acquire a digital image.
How does a CCD work? - correct answer ✔✔Xray photons interact with a scintillation material, and the
signal is transmitted to the CCD. Charges are stored in capacitors in a patter and released line by line to
the ADC.
What is a CCD made of? - correct answer ✔✔A photosensitive receptor and electronics embedded in a
substrate material I'm a silicon chip. Light is emitted. Electron hold pairs are produced in the silicon. Light
and hole pairs are related. Electrons held by electrostatics forces in the array.
What is the chip in the CCD made of? - correct answer ✔✔Polysilicon layer, a silicon dioxide layer and a
silicon substrate. Silicon dioxide layer is an insulator. Substrate contains the charge storage area.
What is a Del? - correct answer ✔✔A detector element that contains three electrodes that hold the
electrons in an electrical potential well. Commonly known as the bucket brigade scheme.
What causes a blooming effect? - correct answer ✔✔Overfill of Del's. Overflow drains built to control
and prevent this.
What will the scintillator and the way it is constructed determine? - correct answer ✔✔How many
photons are absorbed, how much light is produced, the wavelength or color of the light.
Why are CSI detectors structured? - correct answer ✔✔Needles focus light onto a very narrow area.
Reducing light spread, and allowing the use of thicker scintillators minimizing the loss of spatial
resolution.
When reducing the image size, it involves what important components? - correct answer ✔✔The
scintillator, light collection component, noise
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