Flouroscopy Darcie
Help!
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| show | to image objects in motion(dynamic imaging)
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| what are the ASRT practice standards, regarding fluoro | show 🗑
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| who invented first fluoroscope?, when? | show 🗑
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| show | the increase in image intesity, caculated by minification gain x flux gain
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| minification gain | show 🗑
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| flux gain | show 🗑
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| conversion factor | show 🗑
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| -Automatic Brightness Control(ABC) -Automatic Dose Control(ADC) -Automatic Brightness Stabilization(ABS)*DF systems | show 🗑
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| what is the weakest link in the entire fluoro system | show 🗑
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| tv monitor | show 🗑
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| veiling glare | show 🗑
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| lag | show 🗑
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| show | loss of brightness at periphery
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| pincushion effect | show 🗑
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| S distortion | show 🗑
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| show | quicker response as no change in technical factors
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| raster pattern | show 🗑
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| cassette spot films | show 🗑
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| spot film resolution is dependant upon what | show 🗑
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| quantum mottle is controlled with which technical factor | show 🗑
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| what is a fluoroscopic screen | show 🗑
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| disadvantages or dark fluorscopy | show 🗑
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| when was image intensified fluoro developed | show 🗑
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| scotopic vision | show 🗑
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| photopic vision | show 🗑
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| show | -c arm attatchment *overhead II *under table II -carriage -tubes(designed to operate longer at low mA
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| fluoroscopic xray tubes | show 🗑
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| show | -use cone vision(photopic) -increased visual acuity(x10) -amplifies brightness 500-8000 times -tube is glass or metal vacum
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| input phosphor | show 🗑
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| photocathode | show 🗑
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| electrostatcic focussing lenses | show 🗑
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| show | -made of zinc cadmium sulfide or optic disc
-opaque filter is placed under output phosphor to absorb isotropic light and decrease backflow to input phosphor, which would fog image
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| anode | show 🗑
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| MAG tubes | show 🗑
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| show | -input phosphor divided by diameter used during MAG ex. 9"/5"=1.8 MAG
-you must collimate as dose is increased
-decreases contrast
increases dose 2-4 times
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| show | -vidicon or plumbicon
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| vidicon/plumbicon cathode | show 🗑
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| show | sits around electron gun and forms electrons into a beam, accelerated toward target by potential difference(accelerator grids)
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| show | decelerates beam and allows for it to strike target perpendicularly
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| vidicon/plumbicon focussing or steering coils/deflecting coils | show 🗑
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| show | -coupled with output phosphor of image intensifier
-light from OP passes through the window and is absorbed by the signal plate
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| show | -made of thin positively charged graphite
-conducts video signal out of the tube into external video circuit
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| show | -thin insulating mica coating with globules of light sensitive photoconductive material in a matrix pattern
-vidicon target is antimony trisulfide
-plumbicon target is lead oxide
-the more illumination = more electrons = larger video signal
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| show | beam splitter
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| tv or computer matrix system | show 🗑
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| show | -intermittnt fluoro
-pulsed beam
-5 minute alarm
-cumulative timer
-deadman switch
-moile units have cord at least 6ft long
-electronically controlled collimator shutters
-pateients table top exposure is less that 10 R/min
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