During a prolonged fluoroscopic procedure, how can the technologist minimize the patient’s radiation dose while maintaining image quality?

• A. Increase the frame rate of pulsed fluoroscopy.
• B. Decrease the pulsed fluoroscopy frame rate.
• C. Use continuous fluoroscopy at a constant frame rate.
• D. Increase the overall radiation exposure to compensate for frame rate.

Answer: (B)

Pulsed fluoroscopy delivers X‑rays in brief bursts, so the patient’s dose depends on how many bursts occur each second. By decreasing the pulsed fluoroscopy frame rate, you reduce the number of bursts per second, which lowers the cumulative dose over a long procedure while still providing ongoing visualization.

This approach preserves image quality enough for the operator to monitor and guide the procedure, especially with modern imaging systems that can maintain adequate visibility even at a lower frame rate. If the frame rate is reduced, you can still optimize image quality through other means such as adjusting dose per pulse, using image processing, and employing features like last image hold, collimation, and appropriate filtration.

Raising the frame rate or using continuous fluoroscopy would increase the dose, and trying to compensate for a lower frame rate by increasing overall exposure would defeat the goal of dose reduction.