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physic U4

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
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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