Which radiographic technique can provide moving pictures?

• A. Magnetic resonance imaging
• B. Computed tomography
• C. Fluoroscopy
• D. Positron emission tomography

Answer: (C)

Real-time visualization of movement inside the body is provided by fluoroscopy, which uses a continuous X‑ray beam and an image intensifier to display live moving images on a monitor. This makes it ideal for guiding procedures, watching swallowing, or tracking contrast flow and instrument position as it happens. Other imaging methods typically provide static or non-video data: magnetic resonance imaging can capture dynamic sequences but is not used as a continuous radiographic video in the same way; computed tomography mainly produces static cross‑sectional images (though rapid CT scans exist, they are not the standard moving-picture modality); positron emission tomography shows metabolic activity over time but with limited temporal resolution and does not produce real-time motion video of anatomy. Therefore, fluoroscopy is the modality that provides moving pictures.