Which technique is most effective in reducing patient dose during a fluoroscopic examination?

Which technique is most effective in reducing patient dose during a fluoroscopic examination?

• A. Increase magnification mode
• B. Last-image-hold
• C. Use higher frame rates
• D. Continuous fluoroscopy

Answer: (B)

Minimizing dose in fluoroscopy relies on reducing the time the x-ray beam is active and using tools that let you work with stored images rather than continuous exposure. Last-image-hold allows you to freeze and review the most recently captured frame, so you can reposition or confirm anatomy without keeping the beam on. Because exposure accumulates with every second the beam is live, this feature cuts the cumulative dose by avoiding unnecessary live fluoroscopy each time you need to check position or alignment. In contrast, increasing magnification mode raises patient dose because the x-ray beam is more concentrated on a smaller area, higher frame rates increase the number of exposures per second, and continuous fluoroscopy keeps the beam on continuously, all increasing the dose rather than reducing it.

Minimizing dose in fluoroscopy relies on reducing the time the x-ray beam is active and using tools that let you work with stored images rather than continuous exposure. Last-image-hold allows you to freeze and review the most recently captured frame, so you can reposition or confirm anatomy without keeping the beam on. Because exposure accumulates with every second the beam is live, this feature cuts the cumulative dose by avoiding unnecessary live fluoroscopy each time you need to check position or alignment.

In contrast, increasing magnification mode raises patient dose because the x-ray beam is more concentrated on a smaller area, higher frame rates increase the number of exposures per second, and continuous fluoroscopy keeps the beam on continuously, all increasing the dose rather than reducing it.