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22 Cards in this Set
- Front
- Back
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Attenuation |
Beam of radiation is reduced in energy when passing through tissue |
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Automatic rescaling |
Images are produced with uniform brightness and contrast reguarding exposure |
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Contrast |
Difference between adjacent densities on a radiographic image |
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Density |
Degree of darkening or blackness of exposure |
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Computed radiography (CR) |
Cassette based digital radiograph; the digital acquisition modality that uses storage phosphor plates to produce images |
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Digital radiography (DR) |
Cassette lens image receptor system that convert x-rays energy into digital electronic signals for manipulation and display |
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Exposure indicator (EI) |
Numeric representation of the quantity of exposure received by a digital image receptor |
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Fog |
Undesirable exposure to the image receptor |
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Grid |
Device consisting of thin lead straps designed to permit primary radiation to pass while reducing scatter radiation by absorbing |
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Half-value layer |
Amount of filtration necessary to reduce the intensity of the radiation beam to one half its original value |
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Intensifying screen |
Layer of luminescent crystals placed inside a cassette to expose x-ray film efficiency and thereby significantly reduce patient dose |
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Inverse square law |
Mathematic formula that describes the relationship between radiation intensity and distance from the source of the radiation |
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Kilovolt peak (KVp) |
measures the potential difference which controls the quality and affects the quantity of x-ray photons |
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Latent image |
Invisible image created after exposure but before processing |
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Milliampere-seconds (mAs) |
Measurements of Milliamperage multiplied by the exposure time in seconds, which controls the total quantity of x-ray photons produced in the x-ray tube |
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Penumbra |
Fuzzy edge of a object as imaged radiographically; also known as imaged unsharpness |
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Photon |
Quantum or particle of radiation energy |
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Radiolucent |
Permitting the passage of x-rays or other forms of radiant energy |
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Radiopaque |
Not easily penetrable by x-rays or other forms of energy |
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Remnant radiation |
Radiation resulting after the x-ray beam exits the object |
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Source to image distance (SID) |
Distance between the source of the x-ray and the image receptor |
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Umbra |
True edge of an object as imaged radiographically |
