physic U4
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| 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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