Grids
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| What is the purpose of the Grid? | show 🗑
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| What is Transmission responsable for? | show 🗑
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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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| show | kV increases, Field size increases, thickness of part increases, atomic number decreases
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| What are the indications for Grid use? | show 🗑
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| show | Dr. Gustav Bucky in 1913
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| show | Radiopaque lead strips that are separated by radiolucent interspace material, usually Aluminum
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| show | Dr. Hollis Potter. He made the grid lines run in the same direction and made them move during exposure.
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| How do you find the Grid Ratio? | show 🗑
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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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| What is the typical grid ratio? | show 🗑
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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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| T\F: As the lead content increases, the removal of scatter decreases, and the contrast decreases | show 🗑
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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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| What does a linear pattern look like? | show 🗑
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| show | Looks like a wavy pattern and is used mostly in Europe
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| What does a Consentric pattern look like? | show 🗑
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| What type of grid has a higher margin of error? | show 🗑
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| show | focused and parallel
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| show | the lead strips are angled which matches the beam divergence
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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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| What does a parallel linear grid look like? | show 🗑
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| What is a downfall of using a parallel linear grid? | show 🗑
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| What is reciprocating grid movement? | show 🗑
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| What is oscillating grid movement? | show 🗑
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| show | GCF = mAs with grid \ mAs without grid
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| show | decreases
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| What is the Potter-Bucky diaphragm, and what does it do? | show 🗑
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| show | mAs of 1 over mAs of 2 = GCF of 1 over GCF of 2
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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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| show | the ability of the grid to allow the primary radiation to reach the IR and prevent scatter
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| show | True
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| show | the contrast improvement ability which is a comparison of contrast of an image with a grid to that of an image without a grid
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| show | 1.5 an 3.5
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| show | Contrast
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| show | proper aligmnent between tube and grid
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| show | cut off
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| What are some types of grid errors? | show 🗑
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| What is Moire effect? | show 🗑
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| What is the Air-Gap technique? | show 🗑
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| What happens when the grid is upside down? | show 🗑
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| show | the gird has a specified distance as the focal range. if a distance of 44 SID is required and a 72" SID is used, the result will be grid cut off on the peripheral edges of the image
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| What does it mean when the grid is off center? | show 🗑
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| show | when the tube is angled, an off level grid error occurs with a focused grid and it is the only positioning error possible with a parallel grid.
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