Final answer:
A digital fluoroscopy system in the pulsed fluoroscopy mode is a dynamic imaging technique that enables continuous image display by storing image data in a buffer.
Step-by-step explanation:
A digital fluoroscopy system used in the pulsed fluoroscopy mode of operation is considered a dynamic imaging technique. It allows for continuous image display by storing image data in a buffer. However, it does not use a pulse of x-rays lasting 20 years or more, as stated in option 3. The duration of the x-ray pulse will depend on the specific system and application.