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Customer asks frequently asked questions about the filter grid

There are a lot of customer inquiries about the filter grid. Let’s take a look at the frequently asked questions about the filter grid.

1. Principle of the filter grid:

The X-ray filter grid is the best choice to eliminate the scattered rays, and the image will become clearer.

2. When should the filter grid be used?

When the thickness of the photographed body is greater than 10cm, a filter grid should be used.

3. How the filter grid is produced:

Ordinary filter grid: aluminum and lead strips are cut into pieces, then stacked together, and then sealed with aluminum or carbon base.

Breast filter grid: Cut the graphite plate, then fill it with lead, and finally package it as a whole

4. Common specifications and definitions of filter grid:

Grid density: How many pairs of lines are in each centimeter (cm)/inch

Grid ratio: the ratio of the thickness of the filter to the gap width of the lead strip

Dimensions: Common dimensions 15 ‘*18’ inches, 18 ‘*18’ inches and other custom dimensions

Focal length: The distance between the ball tube and the base plate of the filter

5. What is the relationship between the scattered lines and the dose?

The tube voltage directly determines the mass of the ray, which is the softness and hardness of the ray.The energy spectrum distribution of a ray directly determines the number of scattering lines. Generally speaking, the higher the dose, the more scattering lines

6. Why the higher the tube voltage is, the more scattering lines are:

The scatterers excited by high-energy rays are more concentrated and powerful, while the scatterers excited by low-energy rays are scattered and weak

7. How to select the filter grid correctly:

The senior executive voltage shall be selected with a high grid ratio of the filter grid. The above 90kV shall be selected with a grid of more than 10:1, while the below 90kV shall be selected with a grid of less than 8:1

8. How to place the filter grid:

With vertical or labeled side up, the crosshead marked by the harness should be aligned with the line in the center of the filter grid.

For more information about the X-ray filter grid, please call us.

Classification of grid radiology


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