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dig img quiz 1 set1

digital imaging quiz 1 set 1

QuestionAnswer
When was the flouroscope invented and by who? Thomas A. Edison in 1896
What was the early flouroscopic screen (II) made of? Zinc-Cadnium Sulfide
Who is responsible for the development of the screen (II) in 1941? William Chamberlain
What type of vision are the rods of the eye used for? scoptic or night vision
Where are rods found in the eye? around the periphery
Why type of light do rods use? dim/low light
What are the cones of the eye used for? visua acuity, contrast and brightness differentiation
Where are the cones of the eye found? around the fovea centralis
What type of vision are the cones of the eye used for? photooptic/color vision
What part of the eye is the image intensifier designed to utilize? cones
Visual acuity ability to peserve fine detail (cones)
Contrast perception ability to detect differences in light levels (cones)
protective covering of the eye: cornea
light projected through the cornea is focused where? through the lens and onto the retina
how long is the image intensifier? 50cm
what is the potential difference applied to the image intensifier? 25,000 Volts (25 kV)
what is the lead equivalency of the image intensifier and why? minumum 2mm Pb eq, it is a primary barrier.
What is the function of the input phosphor convert the remnant x-ray beam to visible light
What is the input phosphor made of? cesium iodide
What is the function of the photocathode? converts light to electrons (photoemission)
Photoemission electron emission after might stimulation
What is the photocathode made of? cesium and other e- emmiting coponents
What type of charge does the electrostatic focusing lens have and why? negative, to repel e-s and direct them toward output phosphor
How much of what material makes up the output phosphor? 2.5 to 5cm zinc-cadnium sulfide
What does the output phosphor do? convert electrons to visible light
In the flux gain formula, flux gain equals what? number of input light photons / number of input x-ray photons
What is flux gain? measure of increase in light photons at the output phosphor to x-ray photons at the input phosphor
What controls flux? mA
What is brightness gain? ability of the image intensifier tube to increase illumination level of the image
Created by: annaluz87 on 2009-07-14



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