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Assess which grid ratio is the most efficient at absorbing scattered radiation. Define the term grid frequency. Describe how to avoid the five methods of producing grid cut-off. Describe the grid focusing distance and focal range. Differentiate between a grid and a Bucky.
When a grid is used or the grid ratio is changed the goal is to change the amount of scattered radiation on the radiograph and this changes radiographic contrast. Scattered radiation also increases the IR exposure.
Oct 17, 2022 · The greater the grid ratio (eg, 10:1, 12:1), the greater the scatter reduction, increasing image contrast and patient exposure dose. The ratio of the increase in image contrast and the patient dose is referred to as the contrast improvement factor and the Bucky factor, respectively.
- Ethan Sy, Vishal Samboju, Taif Mukhdomi
- 2022/10/17
- Choose the Right Ratio. The suggested ratio options for mobile grids used outside of equipment are 6:1, 8:1 and 10:1. You can go higher and lower, but we would not recommend it for mobile/portable/cross table work.
- Select the Proper LPI (lines per inch) In a digital environment, line pair frequency is primarily software driven. Though there can be more than one proper selection – there are right and wrong LPI matches for each digital system.
- Pick the Best Focal Range. Every grid has a fulcrum – this is where the grid’s optimum SID (source to image distance) is located. All grids can be used within a focal range with very limited consequence – image degradation.
- Choose from Short and Long Dimension. This refers to the Pb (lead) line orientation. Long dimension grids have lead lines that run parallel to the long axis while short dimension grids run parallel to the short axis.
Apr 15, 2019 · The higher the grid ratio, the less scattered radiation reaching the detector; conversely, the lower the grid ratio, the more primary X-rays transmitted through the grid. Thus, the use of grid with an incorrect ratio for a DR system leads to redundant doses or reduced contrast.
- Sanghyun Lee, Woohyun Chung
- 2019
In general, a grid with a higher grid ratio will reject scatter better than a lower grid ratio, due to the limited angle that is allowed by the grid structure. However, a higher ratio grid typically has a higher dose penalty for its use (for screen-film imaging this is known as the "Bucky Factor" which represents the increased dose to the ...
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Why is grid ratio not used often?
The grid ratio is the ratio of the height of the grid plate, often called grid septa, to the separation width (grid Ratio = h/D). If the width of the grid plates is left constant then higher grid plates will block more scatter.
