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Radiology

Chapter 4 Vocab

TermDefinition
Contrast The visual differences between shades ranging from black to white in adjacent areas of the radiograph. A radiograph that shows few shades has a short scale or high contrast. Many variations in shade has a long scale or low contrast.
Crystal Refers to the silver halide combinations that are present in the film emulsions. Larger crystals require less radiation exposure to produce an image.
Definition Sharpness and clarity of the outline of the structures in a radiographic image. Poor definition is generally cause by a movement of the patient, image receptor, or the tube head during exposure.
Density The overall darkening or blackening of the radiographic image. Increasing or decreasing the milliamperage and exposure time affects density.
Exposure Time The time interval expressed in seconds or impulses that x-rays are produced.
Intensifying Screen Plastic sheet coated with calcium tungstate. When exposed to radiation, the fluorescent salts glow, giving off a blue or green light. Produces a latent image faster than is possible when radiation is used alone.
Inverse Square Law States that the intensity of radiation is inversly proportional to the square of the distance from the source of the radiation to the point of measurement.
Long Scale Contrast Low contrast image. A radiographic image with many shades of gray. Produced with high kilovoltage.
Object Film Distance Distance between the object being recorded and the image receptor.
Penumbra Partial shadow or fuzzy outline around the image.
Radiolucent The portion of the radiograph that is dark structures that lack density permit the passage of x-rays with little or no resistance.
Radiopaque Portion of the radiograph that appears light. Resist the passage of radiation
Shortscale Contrast High contrast image. Radiograph exhibits black and white with few shades. Produced with low kilovoltage.
Target Film Distance Distance between the focal spot on the target and the recording plane of the image receptor.
Target Object Distance Distance between focal spot and object being radiographed.
Created by: Strobelight95