121 Unit 1
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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| ma determines | show 🗑
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| current in units | show 🗑
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| show | mas is directly proportional to density
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| time in seconds | show 🗑
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| show | penetrating power, force applied to push the e from cathode to anode;controls QUALITY
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| show | 30%
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| law of reciprocity | show 🗑
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| show | directly proportional
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| show | direct relationship
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| show | inversely related; high s# underexposed, vica versa
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| inverse square law | show 🗑
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| maintaining density using kvp and mas | show 🗑
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| show | densitometer
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| show | penitrometer, shows gray scale on film
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| step wedge, more steps | show 🗑
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| 4 radiographic properties | show 🗑
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| show | ma time kv and distance
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| show | sharpness -> (radiographic)detail and distortion
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| show | visibility (of detail) -> density and contrast
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| show | overall darkness of film, dependant on amount of exposure, must have adequate density to evaluate other qualities
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| contrast | show 🗑
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| show | black areas, opaque
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| show | white areas, translucent
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| film translucence | show 🗑
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| show | is dependant on the # of exposed silver halide crystals
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| show | turn into black metallic silver upon development; more crystals faster film
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| latent image | show 🗑
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| show | after processing
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| show | .25-2.0
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| show | ma, # of photons produced, aka output, intensity, exposure
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| show | kvp, penetrating ability of beam
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| show | # of electrons crossing the tube from cathode to anode per second
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| relationship between ma and density/tube current | show 🗑
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| show | kvp has the greatest effect on density, but is not used to control density
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| show | increase kvp by 15% doubles density and vica versa
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| kvp and contrast | show 🗑
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| show | increase kvp by 15% and halve mas
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| show | aka FFD, focal spot to film distance
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| inverse square law | show 🗑
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| show | to compensate for density changes with changes in sid
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| rule of thumb for sid and intensity | show 🗑
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| double kvp | show 🗑
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| changes in kvp; 30-50 kvp | show 🗑
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| show | 8% change in kvp
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| changes in kvp; 90-130 kvp | show 🗑
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| show | 1942, determines exposure time and therefore the total mas; must still set kvp, chambers and density selection
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| density selections | show 🗑
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| show | didn't have ionizing chambers, only IR, flourescent screen, and photoiodide
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| fog and density | show 🗑
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| grids and density | show 🗑
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| show | direct relationship
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| filtration and density | show 🗑
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| show | inverse relationship
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| show | direct relationship
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| power supply(phase) and density | show 🗑
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| patient size and density | show 🗑
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| factors that do not effect density | show 🗑
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| show | variation in intensity of photons across longitudinal axis of beam; need more photons for thicker body part, put cathode over that part
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| show | with large film size and shorter sid
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| show | aka air gap
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| show | inverse relationship b/c scatter photons diverge and miss film
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| scatter and density | show 🗑
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| density and over/under development(film) | show 🗑
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| show | aerated, fatty, water (muscle, glands), bone, teeth; from least to most dense
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| destructive pathologies and density | show 🗑
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| additive pathologies | show 🗑
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| mAs def. | show 🗑
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| kvp doubled | show 🗑
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| kvp and quality | show 🗑
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| kvp and quantity | show 🗑
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| show | inverse relationship
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| show | increases density
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| radiopaquse constrast media | show 🗑
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| attenuation | show 🗑
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| show | inverse relationship
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| show | 30%
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Created by:
sandonblaise
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