Vascular Imaging

Computed tomography images are generated by X-Rays passing through the body in a helical fashion as the patient moves through a gantry containing a rotating X-Ray tube. After they pass through the body they are picked up by detectors on the opposite side of the tube. Algorithms are used to reconstruct images in slices from the data gathered by the detectors. Computer software can then create images in coronal and sagittal planes.

CT angiography involves an injection of contrast intravenously. The CT operator then times the CT to pick up images when the contrast has reached the arteries - the 'arterial phase'.