Grids
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| What is the purpose of the Grid? | show 🗑
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| show | the dark areas of a radiograph
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| What is Absorption responsable for? | show 🗑
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| What does scatter do to an X-ray? | show 🗑
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| What increases scatter? | show 🗑
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| show | when the part thickness is more than 10 cm, and when the kV is higher than 60
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| Who created Grids, and when? | show 🗑
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| show | Radiopaque lead strips that are separated by radiolucent interspace material, usually Aluminum
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| Who improved the design of Grids, and how? | show 🗑
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| show | Grid Ratio = H/D
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| With a high grid ratio, what scale of contrast is there? | show 🗑
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| T\F: A higher grid ratio is better at removing scatter radiation. | show 🗑
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| show | 5:1 to 6:1
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| show | the number of lead strips in the grid per inch or cm
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| show | False : Higher frequency grids have thinner leas strips.
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| show | High ratio, low frequency grids
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| show | False: As the lead increases, removal of scatter increases, and contrast increases.
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| What are some types of grid patterns? | show 🗑
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| show | It has both horizontal and vertical lead strips
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| show | lead strips run the length of the grid in one direction
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| What does a Rombic pattern look like and where is it used? | show 🗑
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| show | A circular pattern that is evergrowing and is used mostly in Japan
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| show | the linear pattern
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| show | focused and parallel
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| What do focused linear grids look like? | show 🗑
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| show | When the lead strips are angled to match the beam divergence
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| What does improper centering on a linear grid result in? | show 🗑
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| show | the lead strips are all parallel to one another
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| show | absorbs a large amount of the primary beam.
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| show | the grid is moved back and fourth by a motor during exposure.
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| show | a electromagnet that pulls the grid to the side and releases it during exposure.
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| show | GCF = mAs with grid \ mAs without grid
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| What happens to the density of a radiograph when a grid is used? | show 🗑
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| show | it is the Bucky we use today, it moves the grid during exposure.
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| What formula is used when converting from one grid ratio ot another? | show 🗑
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| show | the International Commission of Radiologic Units and Measurements evaluate grid performance by two criteria; selectivity and contrast imporvement ability.
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| What does selectivity describe? | show 🗑
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| T\F: high lead content grids are more selective. | show 🗑
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| What is the "K" factor? | show 🗑
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| show | 1.5 an 3.5
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| When the "K" factor is increased, what is incrased as well? | show 🗑
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| show | proper aligmnent between tube and grid
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| show | cut off
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| show | off level, off center, off focus, upside down, morie effect
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| show | the grid lines must be running in the same direction as the movement of the laser beam that is scanning the imaging plate.
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| show | places a space between the part and the grid. a 10" gap has the same effect as a 15:1 grid
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| show | severe peripheral grid cut off will occur
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| What does it mean when the grid is off focused? | show 🗑
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| show | the CR is off center and the result is a decrease in exposure across the entire image.
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| What does it mean when the grid is off level? | show 🗑
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Created by:
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