digital imaging quiz 1 set 1
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| When was the flouroscope invented and by who? | Thomas A. Edison in 1896
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| What was the early flouroscopic screen (II) made of? | Zinc-Cadnium Sulfide
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| Who is responsible for the development of the screen (II) in 1941? | William Chamberlain
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| What type of vision are the rods of the eye used for? | scoptic or night vision
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| Where are rods found in the eye? | around the periphery
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| Why type of light do rods use? | dim/low light
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| What are the cones of the eye used for? | visua acuity, contrast and brightness differentiation
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| Where are the cones of the eye found? | around the fovea centralis
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| What type of vision are the cones of the eye used for? | photooptic/color vision
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| What part of the eye is the image intensifier designed to utilize? | cones
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| Visual acuity | ability to peserve fine detail (cones)
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| Contrast perception | ability to detect differences in light levels (cones)
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| protective covering of the eye: | cornea
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| light projected through the cornea is focused where? | through the lens and onto the retina
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| how long is the image intensifier? | 50cm
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| what is the potential difference applied to the image intensifier? | 25,000 Volts (25 kV)
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| what is the lead equivalency of the image intensifier and why? | minumum 2mm Pb eq, it is a primary barrier.
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| What is the function of the input phosphor | convert the remnant x-ray beam to visible light
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| What is the input phosphor made of? | cesium iodide
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| What is the function of the photocathode? | converts light to electrons (photoemission)
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| Photoemission | electron emission after might stimulation
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| What is the photocathode made of? | cesium and other e- emmiting coponents
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| What type of charge does the electrostatic focusing lens have and why? | negative, to repel e-s and direct them toward output phosphor
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| How much of what material makes up the output phosphor? | 2.5 to 5cm zinc-cadnium sulfide
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| What does the output phosphor do? | convert electrons to visible light
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| In the flux gain formula, flux gain equals what? | number of input light photons / number of input x-ray photons
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| What is flux gain? | measure of increase in light photons at the output phosphor to x-ray photons at the input phosphor
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| What controls flux? | mA
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| What is brightness gain? | ability of the image intensifier tube to increase illumination level of the image
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