Sherer Ch10
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | diagnostic tube protective housing
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| show | useful or primary beam
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| maximum leakage radiation regulation | show 🗑
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| show | carbon fiber
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| show | within 2% of the indicated SID
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| show | collimator
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| all the radiation that arises from the interaction of an x-ray beam with the atoms of a patient or any other object in the path of the beam | show 🗑
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| x-rays emitted from parts of the tube other than the focal spot | show 🗑
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| show | because lead shutters cannot be placed immediately below focal spot
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| show | 15cm
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| show | luminance
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| show | candela per square meter (nit)
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| simplest of all beam limitation devices | show 🗑
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| show | dental radiography
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| what governs the beam restriction in a cone? | show 🗑
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| show | reduce patient absorbed dose & increase average beam energy
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| show | inherent filtration
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| show | 0.5mm
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| show | 1.0mm Al eq
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| show | added filtration
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| show | 2.5mm Al eq
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| what is total filtration required for tubes operating at 50-70 kVp | show 🗑
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| what is the total filtration required for tubes operating below 50 kVp | show 🗑
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| show | Beryllium
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| thickness of a designated absorber required to decrease the intensity of the primary beam by 50% its initial value | show 🗑
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| show | annually, or when tube replaced or repairs made on tube housing or collimation system
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| show | exposure reproducibility
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| what is the acceptable variance for exposure reproducibility? | show 🗑
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| consistency in output radiation intensity at selected kVp settings when settings are changed from one mA to another | show 🗑
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| what is the most linearity can vary | show 🗑
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| show | 95%
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| show | gadolinium, lanthanum, yttrium
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| show | 57-71
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| advantages of rare earth screens | show 🗑
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| show | as kVp increases, effective screen speed increases, and patient dose decreases
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| show | kVp & screen-film combination
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| show | carbon fiber
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| show | it absorbs half as much radiation as other materials used, lowers patient dose, x-ray tube life extended
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| show | the one furthest from the tube (the back one)
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| what is the advantage to asymmetric screens? | show 🗑
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| show | No less than 12 inches from skin
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| why is there a limit to how close the mobile unit can be to skin | show 🗑
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| image produced by a computer representation of an anatomic information | show 🗑
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| show | positioning errors
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| changes light to electrical signal | show 🗑
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| show | 200
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| why may grids be used more frequently in CR? | show 🗑
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| show | fluoroscopy procedures
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| show | increased image brightness, saving time for radiologist, patient dose reduction
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| how much does image intensifier increase overall brightness? | show 🗑
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| daytime (cone) vision | show 🗑
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| show | scotopic
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| show | 1.5-2 mA
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| what is input phosphor made of? | show 🗑
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| show | zinc-cadmium sulfide
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| show | increases with magnification, because auto adjusts for decreased brightness
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| show | intermittent or pulse
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| show | 75-110 kVp
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| what are SSD requirements for fluoro tubes, both stationary and mobile? | show 🗑
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| what is the ideal position of the image intensifier in fluoro (mobile & stationary) | show 🗑
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| show | up to 25% decrease in kVp
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| show | 2.5mm Al eq, 3.0mm in tubes with image intensifiers
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| how does filtration effect patient dose in fluoro? | show 🗑
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| what is HVL of fluoro unit? | show 🗑
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| what should be documented for every fluoro procedure? | show 🗑
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| show | 10 R per minute @ 12" above, in HLC units, 20R/min
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| show | 2mm lead eq. for image intensifier unit
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| what kind of fluoro procedures produce the highest dose rate? | show 🗑
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| show | higher frame rate, higher dose
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| typical cine tabletop exposure | show 🗑
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| show | high-level-control fluoroscopy (HLCF
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| limitation on fluoro exposure when HLC is present | show 🗑
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| show | 20-120 R/min
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| show | 1-2 Gy
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Created by:
jen.studer
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