Dental Assistant Practice Exam

What is commonly used to reduce patient exposure during radiography?

1. Higher exposure time

2. Collimation of the x-ray beam

3. Use of a film holder

4. Lower milliamperage settings

The correct answer is: Collimation of the x-ray beam

Collimation of the x-ray beam is an essential technique that significantly reduces patient exposure during radiographic procedures. By narrowing the width and height of the x-ray beam, collimation limits the area being irradiated to only the region of interest. This precision minimizes the patient's exposure to unnecessary radiation and helps in reducing the risk of potential radiation-related effects. While higher exposure time, lower milliamperage settings, and the use of a film holder may affect the quality and efficiency of radiographic images, they do not specifically target or reduce the exposure area like collimation does. Higher exposure time and lower milliamperage settings can actually lead to increased radiation dosage if not properly managed. Film holders can enhance image stability and improve workflow, but they do not directly contribute to reducing radiation exposure to the patient in the same impactful way that collimation does. Therefore, collimation stands out as the most effective method for minimizing patient exposure during radiography.