What imaging technique uses moving pictures to visualize how a dye moves through blood vessels?

The correct choice is cineangiography, which is specifically designed to create a series of moving images to visualize the flow of contrast dye through blood vessels. This technique allows healthcare professionals to observe and assess the function of vascular structures in real time, making it particularly useful for diagnosing conditions related to blood circulation, such as blockages or abnormalities in coronary arteries.

Cineangiography combines principles of angiography, where a contrast agent is injected to enhance the visibility of vascular systems, with the motion aspect of cinematography. This unique combination enables detailed evaluation of hemodynamics and the dynamics of the blood vessels under various conditions.

Other imaging techniques mentioned serve different purposes: while electrocardiography focuses on the electrical activity of the heart rather than visualizing blood flow, computed tomography offers cross-sectional images and, when using contrast, does not provide the continuous moving visual of blood flow as cineangiography does. Magnetic resonance imaging is adept at providing detailed images of soft tissues and organs but does not specifically emphasize the dynamic process of dye movement through blood vessels as cineangiography does.