When may the exposure rate at the tabletop exceed 5 rads per minute?

The scenario in which the exposure rate at the tabletop may exceed 5 rads per minute is indeed during magnification mode. In fluoroscopy, magnification mode allows for enhanced imaging detail by adjusting the image intensifier and increasing the radiation dose to achieve clearer visuals of small anatomical structures or lesions. This mode typically requires higher exposure rates to maintain image quality, as it inherently reduces the size of the image, which can diminish the signal-to-noise ratio if exposure levels are not adequately increased.

Understanding the implications of different modes in fluoroscopy is crucial for ensuring patient safety while obtaining the necessary diagnostic information. Different imaging techniques and settings can significantly impact radiation dose, and practitioners must be aware of when it is acceptable for exposure rates to exceed standard levels safely.