Radiologic Technologist Practice Exam

What is the greatest source of medical radiation exposure in the United States?

1. Radiography

2. Interventional fluoroscopy

3. Nuclear medicine

4. Computed tomography (CT)

The correct answer is: Computed tomography (CT)

The greatest source of medical radiation exposure in the United States is indeed computed tomography (CT). This is primarily due to the high frequency and extensive use of CT scans in medical diagnosis and treatment, which results in a significant cumulative dose of radiation to patients over time. CT scans involve multiple X-ray images taken from various angles and are then reconstructed by a computer to create cross-sectional images of the body, providing detailed information that is crucial for accurate diagnosis. While other modalities such as radiography, interventional fluoroscopy, and nuclear medicine contribute to medical radiation exposure, CT scans account for a larger proportion of the total dose due to the higher radiation levels associated with each scan. Furthermore, the increasing reliance on CT imaging in medical practice, as well as advancements that allow for faster and more detailed scans, has led to a growth in the number of procedures performed, amplifying exposure levels. Thus, understanding the significance of CT in medical radiation exposure is crucial for both patients and healthcare professionals in managing and mitigating risks associated with radiation.