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22 Cards in this Set

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Attenuation

Beam of radiation is reduced in energy when passing through tissue

Automatic rescaling

Images are produced with uniform brightness and contrast reguarding exposure

Contrast

Difference between adjacent densities on a radiographic image

Density

Degree of darkening or blackness of exposure

Computed radiography (CR)

Cassette based digital radiograph; the digital acquisition modality that uses storage phosphor plates to produce images

Digital radiography (DR)

Cassette lens image receptor system that convert x-rays energy into digital electronic signals for manipulation and display

Exposure indicator (EI)

Numeric representation of the quantity of exposure received by a digital image receptor

Fog

Undesirable exposure to the image receptor

Grid

Device consisting of thin lead straps designed to permit primary radiation to pass while reducing scatter radiation by absorbing

Half-value layer

Amount of filtration necessary to reduce the intensity of the radiation beam to one half its original value

Intensifying screen

Layer of luminescent crystals placed inside a cassette to expose x-ray film efficiency and thereby significantly reduce patient dose

Inverse square law

Mathematic formula that describes the relationship between radiation intensity and distance from the source of the radiation

Kilovolt peak (KVp)

measures the potential difference which controls the quality and affects the quantity of x-ray photons

Latent image

Invisible image created after exposure but before processing

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

Penumbra

Fuzzy edge of a object as imaged radiographically; also known as imaged unsharpness

Photon

Quantum or particle of radiation energy

Radiolucent

Permitting the passage of x-rays or other forms of radiant energy

Radiopaque

Not easily penetrable by x-rays or other forms of energy

Remnant radiation

Radiation resulting after the x-ray beam exits the object

Source to image distance (SID)

Distance between the source of the x-ray and the image receptor

Umbra

True edge of an object as imaged radiographically