In fluoroscopy, what is the primary reason for utilizing pulsed fluoroscopy mode instead of continuous exposure?

• A. Increase fluoroscopy time
• B. Minimize patient exposure
• C. Improve image resolution
• D. Reduce system noise

Answer: (B)

Pulsed fluoroscopy reduces radiation dose by delivering X‑rays only in short bursts rather than continuously. The patient’s exposure is tied to the beam’s duty cycle—the fraction of time the beam is on. By lowering this duty cycle, the total dose accumulates far less while still providing enough frames to visualize motion. This keeps diagnostic information intact while minimizing radiation exposure to the patient. Continuous exposure would deliver more dose because the beam is on all the time. It’s not primarily about improving resolution or reducing system noise, and the main benefit here is limiting the patient’s radiation dose.