Filtration and Beam Restriction
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show | Spatial Resolution
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Ability to distinguish between two similar tissues | show 🗑
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show | the sharpness of small structures
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show | grids and beam restricting devices
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show | kVp, field size, patient thickness
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What are three types of beam restricting devices? | show 🗑
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Explain why kVp can have such an influence on the intensity of scatter reaching the IR? | show 🗑
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By decreasing the field size you _______ the level of scatter radiation. | show 🗑
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show | aperture diaphragm
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show | restrict beam to a required size; modifications of aperture diaphragms
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Also known as the variable aperture collimator; it is most common in diagnostic radiography | show 🗑
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What is the main purpose of beam restriction? | show 🗑
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show | decrease pt. dose, decreased density, increased contrast with proper compensation for density loss
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If field size is increased (open up collimator), what will happen to pt. dose, scatter, density and contrast? | show 🗑
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What is the biggest problem with using lead aperture diaphragms? | show 🗑
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Ghosting is due to what? | show 🗑
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Where is the lead aperture diaphragm located? | show 🗑
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show | 8-9 penny test; checks for collimator cutoff
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Entrance shutters | show 🗑
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show | project light image onto patient; sits at a 45 degree angle and sits exactly between the light source and focal spot siz
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Moveable lead shutters | show 🗑
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Main purpose of Filters. | show 🗑
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show | False - they have nothing to do with scatter
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What type of material do we use in filters? | show 🗑
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How do filters reduce patient dose? | show 🗑
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show | between the sourece and patient at collimator housing
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Measurement of the amount of absorber required to reduce intial beam intesnity by 1/2 or 50%. | show 🗑
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What is total AL filtration? | show 🗑
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show | envelope (gas or metal; houses anode and cathode) and oil
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show | .5 required
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show | 1.5 required
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What are the requirements for the mm AL used if the kVp range was 70-100? | show 🗑
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show | 3.0 required
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What affect do filters have on image quality (contrast and density)? | show 🗑
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show | wedge filter and trough filter
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What is the purpose of the compensating filters? | show 🗑
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show | the thickest part of filter would be placed under the thinnest part
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