Filtration and Beam Restriction
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| show | Spatial Resolution
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| show | Contrast Resolution
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| Image detail or visibility of detail | show 🗑
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| show | grids and beam restricting devices
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| show | kVp, field size, patient thickness
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| show | aperture diaphragm, cones and cylinders, variable aperture diaphragm (PBL)
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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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| show | reduce
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| show | aperture diaphragm
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| Cones and cylinders | show 🗑
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| Also known as the variable aperture collimator; it is most common in diagnostic radiography | show 🗑
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| show | reduce scatter to improve contrast and reduce patient dose
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| show | decrease pt. dose, decreased density, increased contrast with proper compensation for density loss
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| show | increased patient dose, increased scatter, increased density and decreased scatter
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| show | Problem with ghosting (shadow of anatomy)
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| show | off focus radiation (stem radiation) - electrons radiation does not hit target correctly
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| Where is the lead aperture diaphragm located? | show 🗑
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| What type of test can be performed to see your collimators accuracy? | show 🗑
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| Entrance shutters | show 🗑
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| What is the purpose of the mirror in the PBL? | show 🗑
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| show | controlled by tech; helps to reduce the beam
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| Main purpose of Filters. | show 🗑
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| Filters have an affect on scatter. T/F | show 🗑
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| What type of material do we use in filters? | show 🗑
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| show | absorbs low energy, long wavelength radiation that contributes to skin dose and leaves higher nergy, short wavelength beam which has more penetration.
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| Where is the filter located? | show 🗑
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| show | Half value layer
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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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| show | 2.5 required; 3.0 recommened
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| show | 3.0 required
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| show | density - decreases density as eliminates quantity of beam usedcontrast - lower contrast as leaves with higher kVp
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| What are two examples of compensating filters? | show 🗑
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| What is the purpose of the compensating filters? | show 🗑
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| When radiating a foot how would you use the wedge filter? | show 🗑
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Created by:
sr4095
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