Final answer:
Fluoroscopy is the medical imaging modality that allows for real-time viewing of x-ray images in motion, used in various diagnostic and therapeutic procedures while ensuring proper radiation protection measures.
Step-by-step explanation:
The imaging modality that provides real-time viewing of x-ray images in motion is known as fluoroscopy. Fluoroscopy is similar to radiography, but instead of capturing a still image, it creates a live X-ray movie, allowing healthcare professionals to see the movement of bodily structures such as the gastrointestinal tract or the motion of medical devices. It is extensively used in diagnostic and therapeutic medical procedures, which include the advantage of real-time imaging. Despite its numerous applications, the exposure to ionizing radiation is a concern, and so proper shielding and limiting exposure are important safeguards to protect both the patient and the operator.