Radiologic Technologist Practice Exam

What is the primary purpose of a collimator in radiography?

1. To focus the x-ray beam

2. To reduce patient exposure

3. To enhance image contrast

4. To manage the workload

The correct answer is: To reduce patient exposure

The primary purpose of a collimator in radiography is to reduce patient exposure. Collimators function by limiting the size and shape of the x-ray beam, which helps to target the area of interest more precisely. This targeted approach not only minimizes the radiation dose to the patient by preventing unnecessary exposure to surrounding tissues but also improves the quality of the images obtained. By restricting the anterior extent of the beam to only the area under examination, the collimator acts as a protective barrier that enhances the safety and effectiveness of radiographic procedures. While collimation can contribute to other aspects like image quality and workflow, its most essential role is in reducing unnecessary radiation exposure to patients, which aligns with the principles of radiation safety in healthcare.