What is the primary reason fluoroscopy delivers a higher patient dose than general radiography?

• A. The source of x-ray photons is much closer to the patient
• B. Fluoroscopy uses a higher energy beam
• C. It requires longer exposure times
• D. Radiologists frequently adjust the equipment

Answer: (A)

Fluoroscopy delivers a higher patient dose than general radiography primarily because the source of x-ray photons is much closer to the patient. In fluoroscopy, the x-ray tube is typically situated very close to the patient, which enhances the amount of radiation exposure. Since the radiation dose is inversely proportional to the square of the distance from the source, being closer leads to a significantly higher dose delivered to the patient.

While other factors, such as exposure times and equipment adjustments, can contribute to the overall dose, the proximity of the x-ray source to the patient is a fundamental reason for the elevated dose levels seen in fluoroscopic procedures compared to conventional radiographic imaging.