Which combination would help reduce radiation to the patient during fluoroscopy?

Which combination would help reduce radiation to the patient during fluoroscopy?

• A. Magnification mode; continuous fluoroscopy
• B. High kVp; long exposure
• C. Lead shielding only
• D. Last image hold; pulsed fluoroscopy

Answer: (D)

In fluoroscopy, reducing patient dose comes from lowering both the rate of radiation and the time the patient is irradiated. Pulsed fluoroscopy delivers X-rays in short bursts rather than a continuous beam, so the dose per second is reduced while still providing usable images. Last image hold lets you freeze the most recent image instead of keeping the beam on to acquire new frames, which cuts down on ongoing exposure. Using these together minimizes the cumulative dose while preserving diagnostic information. Other approaches in the options aren’t as effective for lowering dose. Using magnification mode increases patient dose because delivering a smaller field requires more exposure to maintain image brightness. Continuous fluoroscopy has a higher dose rate than pulsed. High kVp with long exposure can lower the image contrast and, if the exposure is long, increases the total dose. Lead shielding helps protect certain tissues but isn’t a substitute for better fluoroscopy technique and won’t by itself minimize the dose to the irradiated region.

In fluoroscopy, reducing patient dose comes from lowering both the rate of radiation and the time the patient is irradiated. Pulsed fluoroscopy delivers X-rays in short bursts rather than a continuous beam, so the dose per second is reduced while still providing usable images. Last image hold lets you freeze the most recent image instead of keeping the beam on to acquire new frames, which cuts down on ongoing exposure. Using these together minimizes the cumulative dose while preserving diagnostic information.

Other approaches in the options aren’t as effective for lowering dose. Using magnification mode increases patient dose because delivering a smaller field requires more exposure to maintain image brightness. Continuous fluoroscopy has a higher dose rate than pulsed. High kVp with long exposure can lower the image contrast and, if the exposure is long, increases the total dose. Lead shielding helps protect certain tissues but isn’t a substitute for better fluoroscopy technique and won’t by itself minimize the dose to the irradiated region.