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PADI - Week 1
Key Terms
| Question | Answer |
|---|---|
| Define Kilovoltage (KV) | Controls the penetrating power of the x-ray beam. The higher the KV, the more powerful the beam will be. When KV is increased electrons move faster causing more energy to be released as x-ray photons. |
| Define Milliamperage (MA) | The current that heats the filament in the cathode of the x-ray machine. By increasing the temperature of the filament the number of electrons will increase and as a result so will the number of x-rays. |
| Define Film Focal Distance (FFD) | The distance between the target and the surface of the x-ray film. The distance between the focal spot and the film affects the quantity of x-rays reaching the film. The greater the distance, the more the beam spreads out and fewer x-rays reach the film. |
| Define Latitude | Describes the range of exposures that will ensure a diagnostic image is possible. If a film has wide latitude there is a greater range of exposure factors that will produce a diagnostic image. |
| Define Density | Describes the amount of blackening seen on a radiographic film. This degree of blackening is related to the specific gravity and the atomic number of the subject under examination. |
| Define Contrast | The difference in density (the degree of blackening between two adjacent structures). Lots of grey = low contrast image. Lots of black and white= high contrast image. |
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aimee_knows_nothing
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