American Registry of Radiologic Technologists (ARRT) Practice Exam

What type of radiation does aluminum filtration primarily remove?

1. High-energy photons

2. Low-energy photons

3. Ionizing radiation

4. Beta particles

The correct answer is: Low-energy photons

Aluminum filtration primarily removes low-energy photons from the x-ray beam. This is important because low-energy photons do not contribute to image formation; instead, they can increase patient dose without adding diagnostic value. By using aluminum filters in x-ray equipment, radiologic technologists can ensure that the x-ray beam is more penetrating and effective, leading to better image quality while minimizing the patient's exposure to unnecessary radiation. High-energy photons are not effectively removed by aluminum filtration, as these are more capable of penetrating matter and contributing to the resultant image. Ionizing radiation is a broader category that includes various forms of radiation, including both high-energy and low-energy photons, rather than being limited to what aluminum filtration addresses. Beta particles are charged particles that are distinct from the photons involved in x-ray production and are not significantly attenuated by aluminum filtration. By employing aluminum filtration, the radiologic community aims to enhance safety and efficacy in imaging procedures, ensuring that patients receive the lowest possible dose that still results in high-quality diagnostic images.