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36 Cards in this Set
- Front
- Back
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What is fluro?
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Provides real time viewing of moving internal structures or fluids, dynamic
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Who and when was fluroscopy invented?
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Thomas Edison in 1896
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How is illumination measured?
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lumen per square meters or lux
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X-ray's and fluro are viewed under what illumination levels?
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100-1000 lux
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Rods are
a.more sensitive to light than cones b.less sensitive |
a. more sensitive
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Structures in the eye used for daylight vision are:
a.rods b.cones |
b.cones
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Another term for night vision is?
a.scotopic b.photopic |
a.scotopic
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True or false:
Rods are colorblind |
True
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Another term for daylight vision is:
a.scotopic b.photopic |
b.photopic
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Structure better detecting different brightness levels are?
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cones
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What is function of image intensifier tube?
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Receives x-ray beam and converts it into visible light image of high intensity.
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X-Ray's enter the glass envelope on the image intensifier tube and interact with what first?
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Input phosphor
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The input phosphor is made of what material?
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Cesium iodide
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Once the xray beam interacts with input phosphor, what occurs next?
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X-ray then converted to visible light.
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The photocathode is located where?
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Bonded directly to input phosphor
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What is the photocathode made of?
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Cesium and antimony compounds
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What is the function of the photocathode?
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Responds to stimulation of input phosphor light by the emission of electrons known as photoemission.
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The number of electrons emitted is ________ to the intensity of the light that reaches it.
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Directly proportional.
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Electrons produced by photoemission will be accelerated to where?
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To the anode.
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What shape is the anode?
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A circular plate with a hole in it.
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What is located on the other side of the anode?
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Output phosphor
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What is the output phosphor made of?
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Zinc cadmium sulfide.
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What is the job of the anode?
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To focus the electrons into a beam.
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What is the job of the electrostatic focusing lenses?
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To control the path of the electrons.
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What is the function of the output phosphor?
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The site where electrons interact and produce light.
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What is the equation for Flux Gain?
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number of output light photons/number of input x-ray photons.
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What is the the equation for Brightness Gain?
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Minification gain x flux gain
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What is the equation for Minification gain?
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(di/do)2
di-diameter of input phosphor do-diameter of output phosphor |
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What happens as the diameter of the multified intensifiers is decreased?
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The image becomes more magnified.
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What is the function of the TV camera?
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Converts light from output phosphor into an electrical signal and sends to TV monitor.
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Function of the glass envelope of TV camera?
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maintains vacuum and provide mechanical support for internal components.
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The cathode in the TV camera contains what?
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The electron gun.
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What is the electron gun?
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A heated filament that supplies constant electron current by thermionic emission.
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What forms the currents from electron gun into an electron beam and helps accelerate them?
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Control grid.
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The beam from the electron gun is further accelerated and focused by the?
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Electrostatic grids.
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What are the three layers of the target assembly?
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1.face plate
2.signal plate 3.target/photoconductive |
