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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| 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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| show | rods and cones
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| show | cones
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| These are cells distributed throughout the retina and are used at low brightness levels(darkness) | show 🗑
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| show | visual acuity
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| show | 2%
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| rods can only discriminate between contrast levels that are at at least what? | show 🗑
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| show | 20-30mins
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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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| Radiation cause what to emitt when striking the input screen/phosphor? | show 🗑
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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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| 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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| show | antimony potassium and sodium cesium
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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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| 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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| show | electronic intensification and minification
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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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| 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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| 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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| show | 50 times: 80 times; and 400 times
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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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| show | resolution
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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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| show | line pairs
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| Line pairs are expressed in | show 🗑
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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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| Sun spots can cause as much as ___ rotation | show 🗑
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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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| show | breaking
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| This is the ability to differentiate borders | show 🗑
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| show | Contrast sensitivity
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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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| These are instruments used to remove the gas spots and is done automatically | show 🗑
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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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| Most intensifiers come from either 2 or 3 what | show 🗑
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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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| If you increase the voltage you do what to the FOV | show 🗑
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| show | the more magnified it is
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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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| show | the electronic signal as needed
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| This compensates for part thickness changes as the patient is moved during an exam | show 🗑
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| Where is the brightness control knob located | show 🗑
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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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| The contrast knob should be _____ until the background noise is visibke then___ slightly to reduce the____ | show 🗑
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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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| show | at least2.5mm AL
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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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| 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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| 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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| 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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| 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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| show | objective lens
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| What are the methods of coupling of TV cameras | show 🗑
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| show | A-allows for multiple viewing systems D-large
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| show | raster pattern
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| show | Active trace
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| show | horizontal trace
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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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| The television monitor is the____ link in the image intensified fluoroscopy | show 🗑
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