anti-scatter grids
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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| what controls scatter? | show 🗑
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| show | incident x-ray photon changes direction with less energy following interaction within patient
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| show | 180 degrees
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| show | 90 degrees
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| show | primary beam
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| show | .1% or 1/1000
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| show | as energy increases, the percentage of scatter v. absorption increases
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| show | pathology such as edema, size of part, improper collimation, atomic # & mass of tissue and barium
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| atomic number | show 🗑
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| show | protons and neutrons in the nucleus
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| barium | show 🗑
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| show | for a part larger than 10 cm. if you use more than 60 kvp
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| scatter and useful density on chest/abdomen | show 🗑
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| what helps control scatter? | show 🗑
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| too much scatter does what? | show 🗑
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| gustav bucky | show 🗑
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| show | in 1920 developed a mechanism which moved the grid during exposure
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| potter/bucky diaphragm means | show 🗑
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| show | to blur out lines and clean up scatter. improves contrast by reducing the amount of scatter reaching the IR
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| DR | show 🗑
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| CR | show 🗑
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| oscillating | show 🗑
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| show | moving back and forth during exposure to improve image quality
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| show | between the patient and IR
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| construction of grid | show 🗑
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| show | loss of density/ brightness due to absorption of imaging, forms pb strips
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| show | parallel, focused, and crisscrossed
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| parallel type | show 🗑
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| show | majority of grids are focused. lines are angled/ tilted inwards to meet divergent of the beam @ a specific focusing difference
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| show | most effective grid, two grids one atop another
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| show | range of SID you can use
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| non- focused types | show 🗑
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| show | pb lines run in one direction parallel to each other
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| show | pb lines run in crisscross formation which improves clean up
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| construction of non- focused grids | show 🗑
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| show | increases SID latitude
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| show | manufactured so peripheral grid lines are tilted to meet beam divergence to eliminate peripheral grid cut off. less latitude/ focusing range (grid radius)
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| grid ratio | show 🗑
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| r= h/d | show 🗑
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| grid ratio | show 🗑
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| use of low v. high ratio | show 🗑
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| show | grid ratio = height of pb lines
distance between grid lines thickness of innerspace
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| grid frequency | show 🗑
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| thicker pb strips clean up more scatter t or f? | show 🗑
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| clamp on grids are used for what? | show 🗑
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| grid cassettes have | show 🗑
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| show | we use high frequency thin pb lines
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| show | potter bucky diaphragm in table bucky. blur out grid lines and motion starts before exposure and stops afterwards.
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| show | reciprocating and oscillating
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| patient dose w/grid vs. patient dose w/out grid | show 🗑
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| k = | show 🗑
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| show | upside down, off level, off center, and off focus
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| upside down | show 🗑
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| show | more common (to light) angled grid or tube, cut-off entire image due to oblique nature, CR cuts across or perpendicular to grid lines
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| off center or | show 🗑
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| off focus | show 🗑
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| stroboscopic effect | show 🗑
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| show | film screen technology in which you would use the cassette backwards
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| air gap technique | show 🗑
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| to prevent OID you would increase what? what is the rule? | show 🗑
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| show | pathology, part size greater than 10-12 cm, and 60>kVp
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Created by:
eckoultd1972
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