Radiologic Technologist Practice Exam

What is the primary purpose of using a grid in radiography?

1. To reduce image contrast

2. To absorb scatter radiation

3. To minimize patient dose

4. To enhance image sharpness

The correct answer is: To absorb scatter radiation

The primary purpose of using a grid in radiography is to absorb scatter radiation. When X-rays pass through the body, a portion of the beam interacts with tissues and generates scatter radiation, which can degrade the quality of the final image by causing a fogging effect. The grid, typically made up of thin lead strips, is positioned between the patient and the film or digital receptor. It selectively allows the primary radiation, which carries useful diagnostic information, to pass through while absorbing scatter radiation that would otherwise contribute to image degradation. By minimizing the amount of scatter radiation that reaches the imaging receptor, the grid improves contrast, enhances detail, and ultimately leads to clearer images. While reducing image contrast, minimizing patient dose, or enhancing image sharpness might be considered beneficial outcomes, the grid’s foundational role is primarily focused on the absorption of scatter radiation. This is crucial for achieving optimal imaging quality, therefore making the absorption of scatter radiation the most accurate response to the question.