Grid Study sheet
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Define grid. | show 🗑
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| show | Body thickness exceeds 10 cm or kVp is above 60
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| show | 1913
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| When did Hollis Potter invent the moving grid? | show 🗑
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| Radiolucent interspace materials are usually made out of what 2 materials? | show 🗑
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| What is the formula for grid ratio? | show 🗑
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| show | Number of grid lines per inch or centimeter.
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| show | contrast, increases
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| Name the 3 grid patterns. | show 🗑
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| show | Parallel (Lead and interspace materials running parallel), and focused (central grid strips parallel and other strips are inclined.)
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| What is the formula for grid selectivity? | show 🗑
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| show | Greek letter Sigma
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| What is the formula for Contrast Improvement Factor K? | show 🗑
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| show | The tube is angled across the long axis of the strips.
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| Define off-center. | show 🗑
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| Define off-focus. | show 🗑
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| Define upside down. | show 🗑
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| What are the 2 types of grid movement? | show 🗑
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| Define air-gap technique. | show 🗑
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| show | Magnification radiography
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| show | The loss of sharpness that results from increased OID.
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| What is the Moire effect? | show 🗑
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| An __________ relationship exists between the distance between lead strips and grid ratio when the height of the grid strips remains the same. | show 🗑
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| As the lead content of a grid increases, the ability of the grid to remove scatter and improve contrast ____________. | show 🗑
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| __________ grids are more commonly used in clinical practice because they can be used when performing procedures requiring tube angulation. | show 🗑
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| The distance from the face of the grid to the points of convergence of the lead strips is called the ___________ __________. | show 🗑
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| show | Convergence line
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| show | Short focal range
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| ________ _________ ________ are used for chest radiography. | show 🗑
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| Focused grids with ________ _____ ____ allow for greater latitude in alignment of the tube with the grid. | show 🗑
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| show | Increase
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| The grid with the higher lead content would have a ___________ selectivity. | show 🗑
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