GRID AND ITS TYPES

The grid was invented by Gustave Bucky. It is made up of a thin plate, in which very thin strips of lead are placed in a specific pattern. The spaces between the strips are filled by low-attenuating materials like Aluminium or carbon fiber. Grids are used to reduce the amount of scattered radiation. Grids are placed between the patient and the X-ray film. It consists of alternating strips of lead. These strips of lead can either be parallel or angled. When using a grid, the exposure factor needs to be doubled from the non-grid exposures because it will absorb some of the primary radiation.

Types of Grids :

Linear Grid - In a Linear grid, the lead strips are parallel to each other in their longitudinal axis.

Parallel Grid - In a parallel grid, the strips are mounted parallel to each other.

Crossed Grid - Crossed grids are very efficient in removing scattered radiation. This consists of two superimposed parallel grids that have the same focusing distance.

Focused Grid - Focused grid is made up of the lead strips that are slightly towards the focal spot. A focused grid may be linear or crossed.

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