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16 Cards in this Set
- Front
- Back
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Spatial resolution |
Ability to image 2 separate objects and distinguish them from one another |
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Other names for spatial resolution |
Recorded detail, resolution, detail, sharpness |
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Contrast resolution |
Ability to distinguish structures of similar contrast (like kidney/spleen) |
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Visibility of detail |
Ability to show recorded detail when image contrast and object density |
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Noise |
Random fluctuation in object density |
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4 components of noise |
1. Film graininess 2. Structure mottle 3. Quantum mottle 4. Scatter radiation |
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Film graininess |
Distribution in size and space of silver halide grains in emulsion |
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Structure mottle |
Phosphor of radiographic intensifying screens |
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Quantum mottle |
X-rays interaction in image receptor ⬆️ mAs ⬇️ kVp and slow image receptors = low quantum mottle |
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Fast image receptors |
High noise, low spatial resolution and contrast resolution |
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Slow image receptors |
Low noise, high spatial resolution and contrast resolution |
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Sensitometry |
Study of relationship between intensity of exposure of film and blackness after process (Exposure to light and % of light transmitted thru film) |
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Toe |
Low radiation... Large variations = small change in OD |
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Straight-Line portion |
Small changes in exposure result in large changes in OD |
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Shoulder |
High exposure levels... Large variations in exposure = small change in OD |
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Reciprocity Law |
OD on radiograph is proportional only to total energy imparted to the radiographic film and independent of time of exposure |
