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Filtration and Beam Restriction

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 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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Created by: sr4095
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