Contemporary definitions for backdraft. noun. a sweep of air backwards; also, a condition in a fire where oxygen is depleted and the fire dies down until a door is opened and the fire flares violently from the intake of oxygen.
CT Internal Auditory Canal. CT Scan of the Internal Auditory Canal. A computed tomography scan (CT or CAT) of the internal auditory canal, also called cross-sectional imaging, allows the radiologist to look at different levels, or slices, of the skull bones leading from the ear using a rotating X-ray beam.
Computed tomography angiography (also called CT angiography or CTA) is a computed tomography technique used  to visualize arterial and venous vessels throughout the body. This ranges from arteries serving the brain to those bringing blood to the lungs, kidneys, arms and legs.