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A customer consults 18*18 grid

Today, I received an inquiry from a customer. The customer is a maintenance engineer and wants to use an 18*18 grid with a flat panel detector. I asked the customer for the grid density, grid ratio and focal length, and finally the customer determined that they wanted a grid with a grid density of 40L/cm, a grid ratio of 10:1, and a focal length of 1.3m.
How to choose a suitable grid? A few points to note:
1. Size: models ranging from 8*10 to 17*17, choose according to specific needs
2. Grid density: The grid density is the number of grids formed by lead bars and their spacing per unit length. The gate density is also called the strip frequency. If the grid ratio is the same, the scattering line with a large grid density will be eliminated efficiently; if the grid density is the same, the elimination effect will be better if the grid ratio is large. Grid density is a very important indicator. In special circumstances, high-density grids are required, which can be selected according to the specific needs of customers.
3. Grid ratio: the ratio of the height of the lead grid bar to the width of the gap, from 3:1 to 15:1, 8:1, 10:1 and 12:1 are commonly used
4. Focal length: from standard short focal length (26′- 32′) focal length (34′- 44′) to far focal length (40′- 72′, 48′- 72′- 60′- 72′) to infinity (parallel line). The commonly used focal lengths are 1m, 1.3m, 1.5m and 1.8m, which can be selected according to the chest radiograph or other parts.
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