CAMRT Radiography Practice Exam

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What is the primary function of a grid in radiography?

Increase exposure time
Improve contrast
Reduce patient dose
Enhance image size

The correct answer is: Improve contrast

The primary function of a grid in radiography is to improve contrast in the images produced. Grids work by absorbing scatter radiation that occurs as x-rays pass through the patient. Scatter radiation can fog the image, reducing the overall contrast and making it difficult to discern details. By utilizing a grid, radiographers can selectively allow the primary x-rays that contribute to the image to reach the film or detector while minimizing the impact of scatter rays, thus enhancing the clarity and differentiation of structures within the image. While other potential functions may be considered, improving contrast stands out as the primary purpose of using a grid in radiographic procedures. This enhanced contrast is critical for accurate diagnosis and evaluation of the images captured.