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Cards In This Set
| Front | Back |
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2 controlling factors for DENSITY
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MAs, SID
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Decreasing the SID by 1/2 does what to the Density?
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Increases the density by 4 times
(Inverse square law)
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If you increase the kV by 15% what must you do to the mAs?
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Decrease the mAs by 1/2
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Increasing the original kV by 10 kV = Doubles the density, but only in the kV ranges of: ?? - ??
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60kV - 80kV
(Rule of thumb)
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Base plus fog is:
1. Density at no exposure
2. Density inherent in the film
3. Tints and dyes in the film
4. All of the above
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4. All of the above
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What effect does an increase in screen speed have on density?
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Provides greater density
(↑speed = ↑ density)
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What effect does an increase in speed screen have on recorded detail?
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Decreases detail
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Which of these is NOT an influencing factor on density?
-Screen Speed
-kV
-Patient thickness
-Tissue density
-Pathology
-Collimation
-SID
-Grid ratio
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SID is a controlling factor, not an influencing factor.
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What effect does doubling the mAs have on density?
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Doubles the density
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A decrease in collimation (greater area of exposure) has what effect on Density?
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Increases density
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Going from a Rare Earth Screen to a Calcium Tungstate Screen does what to density?
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Decreases density, therefore requiring an increase in technique
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Which of these tissue densities is in order from least dense to most dense?
1. Air, muscle, fluid, fat, tooth enamel, bone
2. Tooth enamel, bone, musle, fluid, fat, air
3. Air, fat, muscle, fluid, bone, tooth enamel
4. muscle, fluid, fat, air, tooth enamel, bone
5. Air, fluid, fat, muscle, bone, tooth enamel
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3. Air, fat, muscle, fluid, bone, tooth enamel
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Low kV, low tissure density, and high grid ratio produce what SCALE of contrast
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Short scale contrast, or high contrast
(Remember: anything that will decrease secondary radiation will increase contrast)
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Difference between two or more densities is the definiton of?
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Contrast
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Higher kV produces what wavelength of radiation?
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Short wavelength
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