immage critique - density
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| Film density | the degree of overall blackening from the black metallic silver deposited in the emulsion
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| Window level | digital processing that produces changes in density/brightness
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| In CR and DR “density” refers to: | image density or brightness
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| What is the controlling factor of density for screen film? | mAs
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| What is the controlling factor of density in digital? | window level
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| What does mAs control in digital? | it assures proper exposure of the IR
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| What change in mAs is necessary to produce a visible change in density on screen film? | 30%
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| How should changes in mAs be determined? | mAs should always be doubled of halved
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| FSS can affect density how on an improperly calibrated machine? | 30% increase
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| Anode heel effect is what? | 45% greater density on the cathode side of the tube
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| How are filtration and density related? | inversely
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| Increased tissue thickness affects density how? | increased scatter increases overall density
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| Increase in atomic number (Z | ) affects density how?
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| Distance and intensity are related how? | ½ distance = ¼ intensity
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| “density maintenance formula”? | direct square law
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| Beam restriction and density are related how? | inversely
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| How are scatter and density related? | increased scatter increases overall film density, any factor increasing scatter increases density.
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| Additive pathology and density | additive pathologies are radiopaque, decreasing overall film density.
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| Destructive pathology and density | destructive pathologies are radiolucent , increasing overall film density
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