CAMRT Radiography Practice Exam

How does increasing the grid ratio affect scatter?

1. Increases scatter

2. Reduces scatter

3. No effect on scatter

4. Has an unpredictable effect

The correct answer is: Reduces scatter

Increasing the grid ratio has a direct effect on the management of scatter radiation during radiographic imaging. Higher grid ratios are designed to absorb more scattered photons while allowing the primary beam to pass through with less attenuation. This is due to the increased height of the lead strips relative to the space between them, which effectively increases the amount of scatter that is absorbed. When a radiographic grid is employed, it works by selectively absorbing the scattered radiation that would otherwise degrade image quality. By increasing the grid ratio, the grid becomes more effective at eliminating scatter, resulting in a clearer and more diagnostic radiographic image. This is particularly important in procedures where high-quality images are essential, such as in areas with high densities or where contrast is critical. Thus, a higher grid ratio can significantly reduce the amount of scatter that affects the image, enabling improved contrast and sharper images, which are critical to accurate diagnosis in radiography.