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Two types of grids in radiology4/10/2024 ![]() ![]() All lead strips are straight up and down. Fiber Interspace grids are preferred when using low kVp technics (pediatric radiography).ġ0 Grid Construction 3. Disadvantage when using low kVp technics. Plastic fibersĩ Grid Construction Aluminum is more common than plastic fiber b/c of ease to manufacture, durability and provides additional absorption of low energy photons. Lead is the radiopaque material of choice. Strips are held firmly together then sliced into flat sheets. Designed the Potter-Bucky diaphragm which allowed the grid to move during the exposure.Ī series of radiopaque lead strips which alternate with radiolucent materials. Realigned the lead strips to run in one direction. Despite the crudeness, it removed enough scatter to improve contrast.ħ History 1920 – Dr. Gustav Bucky.Ĭonsisted of wide strips of lead approx. ![]() Grid ratioĥ What is a Grid? A device placed between the patient and film for the purpose of absorbing scatter radiation before it can interact with the imaging receptor.Ħ History - First grid was made by Dr. Employ grid conversion factors in setting techniques. Interact with body tissues and change direction (Compton’s scatter).Īt the completion of this lecture, the participant will: Be able to describe the rationale for using a grid. Become absorbed by the tissues within the body or 3. In general when a radiographic exposure is performed using a grid device, the primary photons will either: 1. As the grids’ ability to improve contrast increases, so does the patient’s radiation dosage per radiographic exposure. This contrast improvement also comes at a cost. This improvement of contrast is achieved by absorption of scatter radiation produced by the patient as the primary beam interacts with the patient’s tissues. 2 Abstract Grids are devices that are used to improve contrast on a radiographic image. ![]()
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