ARRT Fluoroscopy Practice Exam 2025 – Complete Study Resource

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How is the contrast improvement factor (k) determined?

k = contrast without grid / contrast with grid

k = contrast with grid / contrast without grid

The contrast improvement factor (k) is a metric that illustrates how much a grid enhances the contrast of the image during fluoroscopic procedures. This factor is calculated by comparing the contrast achieved with a grid in place to the contrast achieved without the grid.

The formula for determining the contrast improvement factor is represented as the ratio of the contrast with the grid to the contrast without the grid. By using this ratio, you can quantify how effectively the grid is enhancing image contrast. A higher value of k indicates a greater benefit from using the grid, meaning that the grid significantly improves the visibility of the details in the image, which is crucial in diagnostic imaging.

Understanding this relationship helps radiologic technologists assess the impact of using grids in various imaging scenarios and make informed decisions on their use for optimal image quality.

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k = exposure with grid / exposure without grid

k = exposure without grid / exposure with grid

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