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Density
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Comp Questions
| Term | Definition |
|---|---|
| Density | The overall Darkness of the Image - Film |
| Brightness | The overall Brightness of the image - Digital |
| Receptor Exposure | The Amount of Radiation that actually hit the Imaging Plate |
| High Contrast | Short Scale; Narrow Window Width; black, white and a few shades of gray |
| Low Contrast | Long Scale; Wide Window Width; lots of shades of gray |
| Filtration | Filters out low energy beams that only add to dose and do not effect the image. |
| Latitude | The amount of error that can be made and still result in a quality image |
| ALARA | As Low As Reasonably Achievable |
| Law of Reciprocity | mA * Seconds = mAs; as long as the mAs is the same the density / brightness will be the same |
| Attenuation | reduction in the energy of the beam caused by: absorption and scatter |
| Leakage Radiation | x-rays that escape the protective tube housing |
| Off-Focus Radiation | x-rays emitted from parts of the tube other than the focal spot |
| Back Scatter | Photons that scatter after transmission and are deflected backward toward the imaging plate |
| Exit Radiation | x-rays that pass through the part and reach the imaging plate to create the image |
| Primary Radiation | x-ray beam after it leaves the tube and before it reaches the object |
| Remnant Radiation | radiation that passes through the patient |
| Penumbra | the unsharp edge / shadow surrounding the edge of the image |
Created by:
BPalmquist
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