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Radiography Imaging
| Question | Answer |
|---|---|
| attenuation | process by which a beam of radiation is reduced in energy when passing through tissue or other materials |
| Central Ray | theoretical center of a beam of radiation. (CR) |
| Contrast | difference between adjacent densities on a radiograph |
| Density | degree of darkening of exposed and processed photographic or radiographic film |
| Distortion(magnification) | misrepresention of the true size or shape of an object |
| dynamic | w/ motion |
| fog | unwanted exposure or film densities |
| grid | device consisting of thin lead strips designed to permit primary radiation to pass while reducing scatter radiation |
| half value layer | amount of filtration necessary to reduce the intensity of the radiation beam to one half its original value |
| Image Receptor | (IR) medium used to capture the image for recording, such as x-ray film or a digital imaging plate |
| intensifying screen | layer of luminescent crystals placed inside a cassette to expose x-ray film effiently and thereby significantly reduce pt dose |
| inverse square law | math formula that describes the relationship between radiation intensity and distance from the source of the radiation |
| Kilovoltage Peak | (kVp) measure of the potenial difference, which controls the quality and quantity of x-ray photons produced in the x-ray tube |
| latent image | invisible image created after exposure but before processing |
| milliampere Seconds | (mAs) measurement of millamperage times seconds, which controls the quantity of x-ray photons produced in the x-ray tube |
| penetraing ability | ability of an x-ray beam to pass through an object, controlled by the kVp of the beam |
| penumbra | fuzzy borders of an object as imaged radiographically |
| photon | quantum or particle of radiant energy |
| positive beam limitation | (PBL) automatic collimation system used on diagnostic x-ray units |
| primary radiation | x-ray beam after it leaves x-ray tube and before it reaches the object |
| radiolucent | permitting the passage of x-rays or other forms of energy w/ little attenuation |
| radiopaque | not easily penetrable by x-rays or other forms of radiant energy |
| recorded detail | representation of an object's true borders |
| relative speed | relative measurements of the speed of a radiographic film and intensifying screen system |
| remnant radiation | radiation resulting after the x-ray beam exits object |
| resolution | a measurement of the recorded detail on a radiograph |
| scatter radiation | raditation produced from x-ray photon interactions w/ matter in such a way that the resulting photons have continued in a different direction |
| Source-to-Image-Distance | (SID) the distance between the source of the x-rays(usually the focal spot of the x-ray tube) and the image receptor |
| static | unmoving |
| umbra | true border of an objects as imaged radiographically |
Created by:
hakvam
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