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Radiographic contrast increases
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- The grid absorbs scattered radiation and prevents the scatter from reaching and affecting the image receptor. When a grid is used, radiographic contrast increases. The grid is the primary factor used to decrease scatter and increase contrast.
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When a grid is used to reduce x-ray scatter it increases the contrast by a contrast improvement factor (k), but additional radiation dose is needed to compensate for the photons blocked by the grid (Bucky Factor).
When a grid is used or the grid ratio is changed the goal is to change the amount of scattered radiation on the radiograph and this changes radiographic contrast. Scattered radiation also increases the IR exposure.
Antiscatter grids improve the X-ray image contrast at a cost of patient radiation doses. The choice of appropriate grid or its removal requires a good knowledge of grid characteristics, especially for pediatric digital imaging.
Apr 15, 2019 · A grid is one of the key components of a digital radiography (DR) system because it removes scattered radiation, which arises when X-rays penetrate an object and improves diagnostic accuracy by enhancing image quality. With the widespread use of DR systems, demand for grids with high precision has simultaneously increased.
- Sanghyun Lee, Woohyun Chung
- 2019
Feb 27, 2016 · Radiographic grids are used to improve radiographic image quality by absorbing scatter radiation that exits the patient, reducing the amount of scatter reaching the IR. It should be noted that grids do nothing to prevent scatter production; they merely reduce the amount of scatter reaching the IR.
The antiscatter grid plays an important role for enhancing image quality in projection radiography by transmitting a majority of primary radiation and selectively rejecting scattered radiation.
