Chapter 11 Vocab - Part 2
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| Scatter radiation | The result of either classical scattering or the Compton effect.
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| Secondary radiation | Radiation produced by the photoelectric effect.
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| Photoelectric effect | One of three interactions of radiation with the human body tissues. In this effect, the x-ray photon is totally absorbed in the body tissue.
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| Grid ratio | The effectiveness of a grid.
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| Grid lines | Images on the radiograph produced by strips of lead placed in front of the cassette.
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| Stationary Grids | High-frequency grids that do not move during exposure but they produce grid lines.
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| Grid cut-off | Decreased radiographic density frequently accompanied by the appearance of obvious grid lines.
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| Parallel grid | A grid whose radius is infinity.
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| Grid radius | The focusing of lead strips in a grid precisely aligned to the x-ray beam at a specific source-image distance.
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| Grid frequency | The number of lead strips per inch in a grid.
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