Anti-scatter grid
A device used in radiography to reduce scattered radiation
Anti-scatter grid[edit | edit source]
An anti-scatter grid is a device used in radiography to improve the quality of X-ray images. It is designed to reduce the amount of scattered radiation that reaches the X-ray detector, thereby enhancing image contrast and detail.
Function[edit | edit source]
The primary function of an anti-scatter grid is to allow primary radiation (the X-rays that pass directly from the X-ray tube to the detector) to pass through while absorbing scattered radiation. Scattered radiation is produced when X-rays interact with matter, such as the patient's body, and are deflected in different directions. This scattered radiation can degrade the quality of the image by reducing contrast.
Construction[edit | edit source]
Anti-scatter grids are typically constructed from alternating strips of a radiopaque material, such as lead, and a radiolucent material, such as aluminum or plastic. The lead strips are aligned in such a way that they allow the primary X-rays to pass through while absorbing the scattered rays.
Types[edit | edit source]
There are several types of anti-scatter grids, including:
- Parallel grids: These have lead strips that are parallel to each other. They are simple in design but can cause grid cutoff at the edges of the image.
- Focused grids: These have lead strips that are angled to match the divergence of the X-ray beam. This design minimizes grid cutoff and is commonly used in clinical practice.
- Crossed grids: These consist of two sets of parallel grids placed at right angles to each other. They provide better scatter reduction but require higher exposure.
Usage[edit | edit source]
Anti-scatter grids are used in various radiographic procedures, particularly those involving thicker body parts, such as the abdomen or chest. They are essential in computed tomography (CT) and mammography to ensure high-quality images.
Limitations[edit | edit source]
While anti-scatter grids improve image quality, they also increase the required radiation dose to the patient. This is because some of the primary radiation is absorbed by the grid, necessitating a higher exposure to achieve the same image brightness.
Related pages[edit | edit source]
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available.
Advertise on WikiMD
|
WikiMD's Wellness Encyclopedia |
| Let Food Be Thy Medicine Medicine Thy Food - Hippocrates |
Translate this page: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
தமிழ்,
తెలుగు,
Urdu,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
বাংলা
European
español,
Deutsch,
français,
Greek,
português do Brasil,
polski,
română,
русский,
Nederlands,
norsk,
svenska,
suomi,
Italian
Middle Eastern & African
عربى,
Turkish,
Persian,
Hebrew,
Afrikaans,
isiZulu,
Kiswahili,
Other
Bulgarian,
Hungarian,
Czech,
Swedish,
മലയാളം,
मराठी,
ਪੰਜਾਬੀ,
ગુજરાતી,
Portuguese,
Ukrainian
Medical Disclaimer: WikiMD is not a substitute for professional medical advice. The information on WikiMD is provided as an information resource only, may be incorrect, outdated or misleading, and is not to be used or relied on for any diagnostic or treatment purposes. Please consult your health care provider before making any healthcare decisions or for guidance about a specific medical condition. WikiMD expressly disclaims responsibility, and shall have no liability, for any damages, loss, injury, or liability whatsoever suffered as a result of your reliance on the information contained in this site. By visiting this site you agree to the foregoing terms and conditions, which may from time to time be changed or supplemented by WikiMD. If you do not agree to the foregoing terms and conditions, you should not enter or use this site. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates, categories Wikipedia, licensed under CC BY SA or similar.
Contributors: Prab R. Tumpati, MD
