CT ANGIOGRAPHY

CT angiography is an exciting yet controversial application of helical (spiral) CT technology [1]. Although many radiologists equate CT angi ography with three-dimensional (3D) rendering, we believe that axial i mages, multiplanar reformatted (MPR) images, and true 3D models all co ntribute to a better evaluation of the vascular system than was possib le with conventional CT. This occurs because helical scans are volumet ric and are accomplished rapidly with high levels of circulating contr ast material. This article reviews the indications for CT angiography, compares CT angiography with other techniques, and offers a practical methodology for neuroradiologic, thoracic, and abdominal applications of CT angiography.