Principles of Radiographic Imaging 5th Edition Chapter 18
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each of the black spaces below before clicking
on it to display the answer.
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| show | Criss-Cross Grid
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| Two linear grids placed on top of one another so that the lead strips form a criss-cross pattern | show 🗑
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| A grid created with the central grid strips parallel with the strips and becoming more inclined as they move away from the central axis; the lines would intersect along a point in space called the line of convergence | show 🗑
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| A device used to improve contrast of the radiographic image | show 🗑
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| The result of the primary beam being angled into the lead strips | show 🗑
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| The number of grid lines per inch or centimeter | show 🗑
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| The ratio of the height of the lead strips to the distance between the strips | show 🗑
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| show | Linear Grid
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| show | Parellel Grid
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| Why does a grid improve contrast? | show 🗑
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| As a general rule, when should a grid be used? | show 🗑
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| How is a grid constructed? | show 🗑
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| Define Grid Ratio: | show 🗑
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| What type of grid pattern has lead strips running in only one direction? | show 🗑
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| show | The central grid strips are parallel and as the strips move away from the central axis they become more and more inclinded
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| show | The more efficient a grid is at absorbing scatter, the less image receptor exposure. To compensate for the loss of exposure there is an increase in mAs, which increases patient dose.
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| How is the contrast improvement of a grid measured? | show 🗑
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| show | When the tube is angled across the long axis of the grid strips
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| How does the air-gap technique improve contrast? | show 🗑
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