Chapter 18 - The Grid
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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| show | by absorbing scatter radiation before it can reach the image receptor
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| When should a grid be used? | show 🗑
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| show | a grid
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| What type of grid pattern has lead strips running only in one direction? | show 🗑
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| Grids designed so that the central grid strips are parallel and as the strips move away from the central axis they become more and more inclined to match the divergence of the x-ray beam. | show 🗑
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| As the ability of a grid to clean up scatter increases, what is the effect on patient dose and image receptor exposure? | show 🗑
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| show | selectivity and contrast improvement ability
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| show | The contrast improvement factor (K):
K=Radiographic contrast with the grid/Radiographic contrast without the grid
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| When the tube is angled across the long axis of the grid strips, what error can occur? | show 🗑
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| placing the patient at a greater object-to-image distance, creating an air gap between the patient and the image receptor, reducing the amount of scatter reaching the image receptor, improving contrast without the use of a grid. | show 🗑
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| show | grid replacement software
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| All of the following are a cause of an increase in scatter radiation, except: a. reduction in atomic number of tissue b. larger patient size c. larger field size d. decrease in kVp | show 🗑
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| show | 8:1
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| What happens to the grid ratio when the distance between the lead strips decreases, but the height of the grid remains the same? | show 🗑
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| show | grid frequency
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| show | it increases
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| show | it increases
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| What type of error occurs when the tube is angled across the long axis of the grid strips? | show 🗑
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| show | the Moire effect
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| When the lead content of the grid increases, what happens to the ability of the grid to remove scatter and improve contrast? | show 🗑
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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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| show | focused grid
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| A device used to improve contrast of the radiographic image | show 🗑
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| show | grid cutoff
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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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| A grid with lead strips running in only one direction | show 🗑
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| show | parallel grid
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| Exposure Factors Chapter 18 - The Grid | show 🗑
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