Term
has lead strips/ interspaces parallel to eachother
cheaper to manufacture
simplest type |
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Definition
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Term
| ___ ___ happens when the strips are not parallel to the divergent beam in parallel grids |
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Definition
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Term
2 parallel grids with strips perpendicular to eachother
most efficient at cleaning up scatter |
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Definition
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Term
the central strips are parallel with the lateral strips more angled
eliminates grid cutoff because the strips are parallel to the divergent beam |
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Definition
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Term
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Definition
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Term
| ___ grids move at right angels to the grid strips to blur the grid lines |
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Definition
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Term
| oscillating grids use ___ |
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Definition
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Term
| pulls the grid to one side, then releases it in a circular direction causing grid lines to blur |
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Definition
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Term
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Definition
improve contrast
reduce scatter radiation by absorption |
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Term
| grids only transmit light traveling in a ____ to the IR |
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Definition
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Term
| grid strips are made of ___ |
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Definition
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Term
| ___ is the choice of interspace material because of its ___ atomic number, produces less visible _____, non-hygroscopicity |
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Definition
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Term
| grid interspace can also be made of |
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Definition
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Term
| fiber grids are preferred when using __ kVp |
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Definition
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Term
| height of the grid strips divided by the thickness of the interspace material |
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Definition
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Term
| high grid ratio gives a ___ patient dose |
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Definition
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Term
| a high grid ratio is ___ efficient in cleaning up scatter |
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Definition
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Term
| number of grid strips or per inch or cm |
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Definition
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Term
| a high grid frequency shows ___ grid lines on the film, requires a ___ technique, and gives a ____ patient dose |
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Definition
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Term
| the best measure of how well a grid functions and its ability to improve contrast |
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Definition
| Contrast improvement factor (K) |
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Term
| the contrast improvement factor is dependent on |
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Definition
the amount of scatter produced
kVp
volume of tissue irradiated |
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Term
| contrast improvement factor definition |
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Definition
| ratio of the contrast of a radiograph taken with the grid to the contrast of a radiograph taken without a grid |
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Definition
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Definition
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| K is __ for higher ratio grids |
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Definition
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Term
| ratio of transmitted primary radiation to transmitted scatter radiation |
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Definition
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Term
| grids with ___ lead content have a greater selectivity |
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Definition
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Term
| things that cause a higher patient dose |
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Definition
high grid ratio
high grid frequency |
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