Principles of Radiographic Imaging - Carlton
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| show | Not part of useful beam, unwanted density on the radiograph, overall graying effect (fog), contributes to patient and operator dose
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| Factors contributing to Compton scatter | show 🗑
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| Increase kVp | show 🗑
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| Decrease in kVp | show 🗑
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| show | Increases patient dose, increased photoelectric absorption, to maintain image density/exposure a decrease in kVp is accompanied by an increase in mAs
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| show | Shorter scale of contrast, fewer grays
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| Field Size = Collimation | show 🗑
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| Field Size | show 🗑
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| show | By decreasing the field size fewer photons reach the IR so the exposure is decreased, you must increase mAs to maintain exposure
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| show | Thicker body parts produce more scatter, more atoms, more photon interactions, resulting in an increase scatter production
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| Decreasing Part Thickness | show 🗑
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| show | 1. Reduce patient dose 2. Limits scatter produced 3. Enhances contrast 4. Visibility of detail
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| Variable Aperture Collimator | show 🗑
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| show | (1st) reduces off focus radiation
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| show | (2nd) decreases penumbra
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| Positive Beam Limitating Device | show 🗑
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| Beam Filtration | show 🗑
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