Equipment design for Rad Protect; Managment of pt rad dose during xrays
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| show | Defines size and shape of the radiographic beam.
-Aperture diaphragm
-Cones
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| show | Positive beam limitation; A feature of current radiographic collimators that automatically adjusts the collimators so that the radiation field size matches the film size
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| show | Internal beam limitation starts with the upper shutters, then the lower shutters which are controlled by the radiographer;
-Stops the production of scatter radiation by reducing off-focus or stem radiation
-Reduces patient exposure
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| show | 15cms below collimator
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| Inherant filtration | show 🗑
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| show | Consists of sheets of Al added outside the glass window above the collimator. This along w/ inherent filtration should equal 2.5 mm Al equivalent
-For xray units above 70KVP
-2.0mm Al equivalent
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| Filtration (4) | show 🗑
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| show | Flat contact shield, shadow shields, shaped contact shield, clear lead
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| show | Aluminum or lead inserted between the s-ray source and the patient to modify the quality of the beam across the field of view
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| show | attenuate x-rays that are directed toward the thinner, or less dense area while permitting more x-radiation to strike the thicker, more dense area
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| Wedge filter | show 🗑
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| Trough filter | show 🗑
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| Tech factors for pt protection | show 🗑
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| show | the light emitted from the intensifying screens
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| Rare earth screens are | show 🗑
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| Speed increases when | show 🗑
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| show | Never used for tissue less then 10cm. Remove the scatter radiation, before it hits the film. Added or increasing the grid ratio requires the radiographer to increase their technical factors.
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| Air Gap Grid | show 🗑
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| show | SSD must be at least 12 inches (30cm)
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| show | 12 inches
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| Pt average dose for mammo | show 🗑
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| show | 1-3 rad for skull, 2-6rad for body
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