What strategies reduce patient dose during fluoroscopy?

• A. Use only still images.
• B. Pulsed fluoroscopy, last-image hold, adjust frame rate, collimation, shielding, proper technique.
• C. Increase distance only; ignore technique.
• D. Continuous fluoroscopy; high frame rate; no shielding; no collimation.

Answer: (B)

Reducing patient dose during fluoroscopy relies on methods that limit the radiation delivered and keep it targeted to what is needed. Pulsed fluoroscopy lowers the beam-on time by delivering radiation in short bursts rather than a continuous stream, which lowers the average dose while still providing essential real-time information. The last-image hold lets the operator use a cached image instead of taking new exposures, reducing the overall number of radiographs. Lowering the frame rate decreases how many frames are produced per second, cutting dose with only a potential trade-off in temporal resolution that is acceptable in many procedures. Collimation restricts the x-ray field to the exact area of interest, reducing exposure to surrounding tissues and decreasing scatter. Shielding devices protect radiosensitive organs when feasible, further reducing dose. Proper technique encompasses choosing appropriate exposure factors, utilizing automatic exposure control effectively, maintaining optimal distance and geometry, and ensuring the patient is positioned to minimize unnecessary magnification and repeat imaging. In contrast, continuous fluoroscopy at high frame rates with no shielding or collimation, or ignoring these strategies, would increase the patient’s radiation exposure without improving safety.