Which term best describes the radiology procedure that visualizes internal organs in motion?

The term that best describes the radiology procedure designed to visualize internal organs in motion is fluoroscopy. This imaging technique utilizes a continuous X-ray beam to create moving images of the internal structures of the body. Unlike standard X-rays, which capture still images, fluoroscopy allows healthcare providers to observe the functioning of organs and systems in real time. This capability is particularly useful for assessing the dynamic processes of bodily functions, such as swallowing or the movement of the gastrointestinal tract.

In contrast, the other imaging modalities mentioned do not provide this dynamic representation. For instance, X-rays produce static images and are primarily used for structural imaging. MRI (Magnetic Resonance Imaging) offers detailed images of soft tissues but does not typically visualize motion in real time. CT (Computed Tomography) scans also generate cross-sectional images and do not provide continuous motion visualization. Therefore, fluoroscopy is uniquely suited for the observation of internal organs in action.