physic U4
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| show | Thomas Edison ; 1896
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| show | Patterson CB2 screen
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| Early fluoroscopy required what for the eyes? What eyes could be worn? | show 🗑
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| show | zinc cadmium sulfide
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| show | yellowish/green light which is a very low light
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| When were advances made to image intensification and why? | show 🗑
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| What things are read for improvement in image intensification? | show 🗑
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| show | lens at the front of the eyes
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| Where is the light focused in the eye? | show 🗑
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| What is the membrane lininig the inside surface of the eye? | show 🗑
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| What are the two types of cells that the retina contains? | show 🗑
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| These are concentrated in a small spot in the center of the eye and are sensitive to light at ordinary brightness(used for daylight) | show 🗑
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| These are cells distributed throughout the retina and are used at low brightness levels(darkness) | show 🗑
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| This is the ability to discriminate small images? | show 🗑
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| Cones can descriminate between contrast levels as low as what? | show 🗑
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| show | 50%
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| How much time for darkness is needed to adapt for conventional fluoroscopy is required? | show 🗑
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| What is an electronic device that converts instantaneously, in several steps, an x-ray image pattern into a cooresponding visible light pattern of significantly higher energy per square cm i=of viewing system | show 🗑
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| show | an aluminium dish
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| show | light photons
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| show | 32,000
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| What is the input screen/phosphor composed of | show 🗑
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| the photocathode is seperated from the input phosphor by what | show 🗑
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| show | electrons; the most inefficient part of the unit
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| What is the photocathode composed of? | show 🗑
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| This is surrounded by an anode | show 🗑
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| What does the output screen/phospher convert elctrons (electrostatic latent image into? | show 🗑
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| show | zinc sulfide
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| Where are the electrostatic lens/grids placed | show 🗑
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| show | Help to focus the electrons(electrostatic image) onto the output phosphor
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| A potential difference of___kVp between the - and + to increase what? | show 🗑
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| what does all of these intensify? | show 🗑
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| The giving of the electronos kinetic energy is called? | show 🗑
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| What does electronic intensification do? | show 🗑
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| the light photons are forced into a smaller area on the output phosphor as compared to the input phosphor is called? | show 🗑
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| show | radiation energy->light photon energy->electrons(electrostatic latent image->visible light image
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| show | x-ray->light->electrons->light->electric signal->light
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| Electronic intensification will be responsible for about______ of the increase in brightness and minification about____ of the increase in brightness for and approximate increase of brightness of about_____ | show 🗑
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| show | Image Amplifier Gain
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| show | Electronic intensification (minification)
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| This is the measurement based on the comparision of light given off at the output phosphor in relation with light given off by the input phosphor | show 🗑
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| This is the radom fluctuation of brightness over a given are caused by the number of light photons available at any given instant of time for that area | show 🗑
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| show | resolution
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| show | lines per inch using the line bar test tool
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| What are the factors that affect resolution? | show 🗑
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| show | line pairs
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| show | per inch or millimeter
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| WThis is when electrons leave the photo emissive layer of the input phosphor and get pulled away from their path by outside magnetic forces | show 🗑
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| show | 14 degrees
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| This is a metallic ring constructed of an alloy that has the same tempature coefficient as that of the glass envelope and is used as a cathode connection | show 🗑
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| The covar ring helps the glass from_____ | show 🗑
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| show | contrast
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| show | Contrast sensitivity
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| show | Focusing
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| show | gas spots
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| These are instruments used to remove the gas spots and is done automatically | show 🗑
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| show | vignitting
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| show | Fields of view(areas examined)
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| show | Multifield Image intensifier
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| What are the most common types of multifiled image intensifiers | show 🗑
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| show | a higher voltage is placed on the electrostatic grid
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| If you increase the voltage you do what to the FOV | show 🗑
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| The smaller the FOV is what happens to the image | show 🗑
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| show | increases the dose
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| show | dimmer image/ to compensate for this the mA is automatically increased
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| The ABC varies the_____ accrouding to the changes in the part examined | show 🗑
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| Where is the detector(ABC) placed on the fluro tower | show 🗑
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| AGC varies what | show 🗑
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| show | brightness control
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| show | on the fluoro tower which can be adjusted by the operator as needed
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| show | 4-6mA
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| show | 65-75;70-80;70-80;80-90;100-110;110-120;110-120
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| show | 5 minutes
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| When contrast is___ at the TV monitor, the amount of____on the monitor will___ also | show 🗑
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| show | turned up;turned down; noise effect
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| The ___ should be adjusted first then____ | show 🗑
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| To help reduce unwanted magnification what should you do? | show 🗑
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| The brake should be what for the patients safety | show 🗑
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| show | 38cm stationary; 30cm for mobile units
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| What is the equivalence for filtration | show 🗑
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| What must the exposure switch be | show 🗑
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| show | .25mm Pb
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| What is the equivelance for the protective curtain | show 🗑
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| What is the intensity for a table top; for fluoroscopy | show 🗑
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| for every____ of fluoroscopic technique one can assume a tabletop intensity of______ | show 🗑
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| The image intensifier assembly serves as a primary protective barrier and must be at least____ | show 🗑
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| show | Vidicon
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| show | Plumbicons
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| show | Electron gun-cathode; target assembly-anode; electrostatic grids
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| show | A-small size,easly manipulated and can withstand rough handling D- can not accommodate other imaging devices and cassette loaded spot films asr necessary
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| show | lens coupling
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| this accepts the light for the output phosphor and alignment of the lens is the most critical | show 🗑
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| show | has a beam splitter and objective lens
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| What are the advantages and disadvantages to lens coupling | show 🗑
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| show | raster pattern
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| The electron beam starts in the upper-left corner of the screen and moves to the upper right cornor to produce an______ | show 🗑
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| show | horizontal trace
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| show | Television field
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| show | Verticle trace
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| show | television field; interlace
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| show | one television frame; 262 lines;1/60;525 line;1/30; 525 line system
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| show | weakest
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