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What are the different types of X-ray grids and how do they differ?

There are two main types of X-ray grids: parallel grid and focused grid. Both types of grids are used to improve the quality of X-ray images by reducing scattered radiation and enhancing image contrast. They differ in their construction and design.
Parallel Grid: A parallel grid consists of thin, parallel lead or aluminum strips separated by radiolucent material, such as plastic or carbon fiber. The lead or aluminum strips absorb scattered radiation, reducing its impact on the image, while allowing primary X-rays to pass through. The strips are usually placed perpendicular to the path of primary X-ray beam.
Parallel grids are further classified based on their grid ratio, which is the ratio of the height of the grid strips to the distance between them. Higher grid ratios provide better scatter removal but also typically require higher radiation exposure. Parallel grids are commonly used in general radiography, where the X-ray tube and detector are placed in a fixed position.
Focused Grid: A focused grid is designed to compensate for the divergence of X-rays as they pass through the patient’s body. It consists of lead strips that are angled toward a focal point, which corresponds to the X-ray source. The strips are closer together at the top and farther apart at the bottom.
Focused grids are used with moving X-ray tube and detector systems, such as in mobile radiography or fluoroscopy. They are designed to minimize image quality degradation caused by tube angulation.
In addition to these two main types, there are also some specialized grids used for specific imaging applications, such as cross-hatched grids for mammography or air-gap technique for certain examinations.
It’s worth noting that the use of grids increases radiation dose to the patient due to the increased amount of radiation that is absorbed. Therefore, grids are typically used when necessary, such as for thicker body parts or when high-contrast images are required. Whatsapp:+86 18953613955. Email:

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