physic U4
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| show | Thomas Edison ; 1896
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| What was the first image intensification screen called? | show 🗑
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| Early fluoroscopy required what for the eyes? What eyes could be worn? | show 🗑
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| The patterson CB2 were composed of what? | show 🗑
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| What did the patterson CB2 emitt? | show 🗑
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| show | in 1960s to improve the brightness levels
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| What things are read for improvement in image intensification? | show 🗑
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| The light is reflected from an object and enters through what? | show 🗑
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| Where is the light focused in the eye? | show 🗑
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| show | retina
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| show | rods and cones
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| show | cones
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| show | rods
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| show | visual acuity
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| show | 2%
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| show | 50%
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| show | 20-30mins
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| show | image intensification
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| radiation first passes through what at the front of the intensifier? | show 🗑
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| show | light photons
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| One x-ray photon will produce how many light photons | show 🗑
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| show | cesium iodide
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| show | a thin sheet of glass
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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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| show | output screen/phosphor
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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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| What does the electrostatic lens/grids do? | show 🗑
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| A potential difference of___kVp between the - and + to increase what? | show 🗑
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| show | electronic intensification and minification
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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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| give the order in which the energy is transferred in the output screen/phosphor | show 🗑
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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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| This is the term given to the intensity of light at the output phosphor in relation to the light given off by a Patterson CB2 screen | show 🗑
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| show | Electronic intensification (minification)
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| show | Brightness gain
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| show | scintinllation
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| This is the ability of an amplifier to differentiate very small objects(detail) | show 🗑
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| What is resolution measure in | show 🗑
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| show | geometric blurring due to focal spot size; geometric blurring due to phosphor graininess, and scintillation/quanyum noise caused by too low mA
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| show | line pairs
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| Line pairs are expressed in | show 🗑
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| show | Image rotation
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| Sun spots can cause as much as ___ rotation | show 🗑
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| show | covar ring
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| show | breaking
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| This is the ability to differentiate borders | show 🗑
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| This is the relationship between contrast and resolution | show 🗑
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| show | Focusing
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| This is when photoelectrons from the photocathode meet in the center and ionize some gas molecules which causes an area on the output phosphor to be lackin electrons and shows up as bright spots | show 🗑
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| show | gettering devices
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| This is when brightness fall off; loss of light at the periphery of the image; pin cushion effect; and is due to the curvature of the photocathode | show 🗑
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| show | Fields of view(areas examined)
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| This is actually changing the size of the out put phosphor | show 🗑
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| What are the most common types of multifiled image intensifiers | show 🗑
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| When a smaller FOV is selected what happens | show 🗑
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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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| show | in the beam
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| AGC varies what | show 🗑
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| show | brightness control
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| Where is the brightness control knob located | show 🗑
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| The fluromA is usually between | show 🗑
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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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| show | the fluoro tower should be kept as close to the patient as possible
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| The brake should be what for the patients safety | show 🗑
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| What is the source to table top distance for stationary unit; mobile unit | show 🗑
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| What is the equivalence for filtration | show 🗑
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| show | a dead mans switch
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| What is the equivalence for the bucky slot holder | show 🗑
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| show | .25mm Pb 45x45cm
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| show | should never exceed 2.1R/min for each mA of operation at 80kVp;10R/min should never be exceeded
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| show | milliampere;2rad/min
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| show | 2mm Pb equivalent
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| What is the most commonly used TV camera | show 🗑
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| What is the second most commonly used TV camera | show 🗑
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| What are the components of a television camera and what do they serve as | show 🗑
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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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| What are the methods of coupling of TV cameras | show 🗑
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| What are the advantages and disadvantages to lens coupling | show 🗑
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| An electron beam forms a light image on the TV screen by producing____ | show 🗑
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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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| The electron beam is blanked(turned off) and returns to the left side of the screen which is called | show 🗑
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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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| The television monitor is the____ link in the image intensified fluoroscopy | show 🗑
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