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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
Who invented image intensification and when?   show
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What was the first image intensification screen called?   show
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show Dark Adapt ion; Red goggles  
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The patterson CB2 were composed of what?   show
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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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show retina  
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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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show rods  
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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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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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show visible light image of much greater brightness  
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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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show 25; kinetic energy of the electrons  
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what does all of these intensify?   show
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show electronic intensification  
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show increases the kinetic energy between the photcathode and the output phosphor will increase the brightness approximately 50 times  
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show minification  
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give the order in which the energy is transfered in the input screen/phosphor?   show
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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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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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What is image amplifier controlled by   show
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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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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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What are the factors that affect resolution?   show
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One pair consists of one opaque bar and one equally wide opening on a test is called   show
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show per inch or millimeter  
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show Image rotation  
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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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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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This refers to focusing the elctrons leaving the photocathode   show
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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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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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show Dual mode at 25cm/17/cm and triple mode 25cm/17cm/12cm  
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show a higher voltage is placed on the electrostatic grid  
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show decrease it  
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show the more magnified it is  
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Increasing the magnification does what to the patient   show
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the magnification mode reduces the minification gain causing a   show
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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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This compensates for part thickness changes as the patient is moved during an exam   show
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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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What should the fluoroscpic timer be set at the begining of every procedure   show
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show increased;visible background noise; increased  
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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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show in place for the patients safety during myelgrams  
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What is the source to table top distance for stationary unit; mobile unit   show
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show at least2.5mm AL  
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What must the exposure switch be   show
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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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What is the intensity for a table top; for fluoroscopy   show
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show milliampere;2rad/min  
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show 2mm Pb equivalent  
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show Vidicon  
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show Plumbicons  
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What are the components of a television camera and what do they serve as   show
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What are the advantages and diadvantages of a fiber optic   show
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this has a beam splitting mirror which reflects a predominate percentage of the light in one direction for stimulataneous viewing/recording   show
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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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An electron beam forms a light image on the TV screen by producing____   show
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show Active trace  
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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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The process continues all the way down the screen to form a____   show
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show Verticle trace  
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show television field; interlace  
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Two interlaced field for what and each field has___ lines every____secs; this forms one_____ tv field every_____ sec; _____is teh most commonly used   show
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show weakest  
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