Term
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Definition
Depends on:
-Radiographic density
-Contrast
-Geometric factors that affect detail |
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Term
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Definition
Ability to tell tissues apart
The difference of the dencesity of structures |
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Term
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Definition
Degree of blackness or darkness on an x-ray
More black = more dense |
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Term
| Factors Affecting Density |
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Definition
Number of x-rays that reach the film - mA
Penetrating power of the x-rays - kVp
Developing time
Temperature of the developer
Tissue tickness |
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Term
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Definition
Thick body parts or dense tissue = less dense x-rays
Radiographic density is inversely proportional to tissue density |
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Term
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Definition
Visible difference between two adjacent radiographic densities
High contrast - black and white tones
Low contrast - many shades of gray |
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Term
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Definition
kVp level
Scatter
Film type
Film fog
Subject contrast |
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Term
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Definition
Quantity of x-rays (# of electrons)
Controls density |
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Term
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Definition
Increased kVp results in increased penetrating power
Too low = washed out appearance |
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Term
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Definition
As kVp increases, so does scatter
Non-imaging forming x-rays |
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Term
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Definition
Use to decrease the amount of scatter created when the correct kVp is used
Placed between patient and image receptor
absorbs non-imaging forming x-rays (scatter) |
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Term
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Definition
Image sharpness
Clarity
Distinctness
Perceptibility |
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Term
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Definition
Large focal spot
Motion
Screen-film combination |
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