In fluoroscopic procedures where actual motion observation is unnecessary, which device can significantly reduce patient exposure?

The video disc recorder is the correct choice for significantly reducing patient exposure in fluoroscopic procedures where actual motion observation is unnecessary. This device captures the fluoroscopic images electronically, allowing for the storage and review of the procedure without the need for continuous radiation exposure typical in traditional fluoroscopy.

In situations where dynamic observation is not critical, the use of a video disc recorder enables operators to record key images rather than exposing the patient to radiation for the duration of the procedure. Consequently, it provides the benefit of reducing cumulative dose while still allowing for the necessary imaging to be captured and analyzed later.

Other devices like the mirror optic system, TV camera, and cine camera either do not offer the same level of dose reduction or are designed for continuous imaging and may require prolonged exposure to achieve the needed results, which is not ideal in cases where movement is not required for analysis.