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Sherer Ch10

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 diagnostic tube protective housing  
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show useful or primary beam  
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show not to exceed 100 mR/hr when the tube operated at its highest voltage, and measured at 1m  
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what type of material routinely used in manufacturing of x-ray table?   show
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show within 2% of the indicated SID  
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show collimator  
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show scattered radiation  
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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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how far away should the collimator be from the skin to prevent skin sparing   show
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show luminance  
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primary unit of luminance   show
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show aperture diaphragm  
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where are beam defining cones routinely used?   show
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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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show 1.5mm Al eq  
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what is the total filtration required for tubes operating below 50 kVp   show
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what takes the place of glass in the window of the mammo unit?   show
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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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how often should HVL be checked?   show
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consistency in output in radiation intensity for identical generator settings from one individual exposure to subsequent exposures   show
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what is the acceptable variance for exposure reproducibility?   show
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show exposure linearity  
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show 10%  
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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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show conversion more efficient (absorb 5x more than old calcium tungstate), decreased patient dose, less thermal stress on tube, increased tube life  
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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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what material is used in the front of cassettes?   show
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why was the use of carbon fiber in film cassettes a benefit?   show
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show the one furthest from the tube (the back one)  
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show greater uniformity in image and decrease in patient exposure  
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what is the SSD requirements for mobile radiography?   show
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show to limit the effects of the inverse square falloff of radiation intensity with distance, and lower patient dose  
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image produced by a computer representation of an anatomic information   show
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what kind of retakes will not be eliminated by digital radiography   show
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show photomultiplier tube  
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show 200  
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show CR is more sensitive to scatter radiation  
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produce the greatest patient radiation exposure rate in diagnostic radiography   show
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benefits of image intensifier in fluoro   show
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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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what is typical mA for fluoroscopy   show
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show CsI  
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what is output phosphor made of?   show
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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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show no less than 15" in stationary, and no less than 12" in mobile  
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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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what is minimum filtration in fluoro tube?   show
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how does filtration effect patient dose in fluoro?   show
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show 3-4mm Al when kVp range 80-100  
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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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required protective barrier thickness?   show
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show cine  
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frame rate fx on patient dose   show
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typical cine tabletop exposure   show
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operating mode for fluoro equipment in which exposure rates are substantially higher than those normally allowed in routine procedures, allows visualization of smaller and lower contrast objects   show
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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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FDA recommends note in patient's record if skin dose of what is received?   show
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