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Scatter radiation
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- Scatter radiation is detrimental to radiographic quality because it adds unwanted exposure (fog) to the image without adding any patient information.
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A radiograph taken without a grid has more scattered radiation on it than one taken with a grid. Scattered radiation increases the exposure to the image receptor even though it is unwanted and doesn’t represent the anatomy.
The Bucky Factor is the ratio of the increase in patient dose with the grid to the patient dose without the grid. If the Bucky Factor is 2, then twice the mA is required to keep the same detector exposure.
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.
In digital radiology and fluoroscopy, flexibility of using different type of grids in one system or making the examinations without any grid require better understanding of the grid parameters by the users.
Feb 6, 2015 · To eliminate this problem, a device called a radiographic grid is used to control scatter radiation. The grid is designed to remove scatter radiation from the remnant beam (beam leaving the patient’s body) and to transmit only the remnant photons which carry useful information to the image receptor, as shown below in Figure 1.
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.
Feb 27, 2016 · This chapter focuses on radiographic exposure techniques and the use of accessory devices, and their effect on the radiation reaching the image receptor (IR) and the image produced. Radiographers have the responsibility of selecting the combination of exposure factors to produce a quality image.
