Advances in CT and MR Technology.

This article will review recent advances in computed tomography (CT) and magnetic resonance (MR) hardware and software techniques that have dramatically changed the use of CT and MR angiography. For CT angiography, technology has increased the speed of acquisition, reduced the radiation dose necessary to diagnose disease, and simplified the ability to characterize disease. Similarly, advances in MR angiography have focused on safer techniques that do not require the use of intravenous contrast agents, increased the speed of acquisition, and improved spatial resolution. In addition, new MR angiography methods have expanded the use of MR angiography beyond purely anatomical information toward quantitative hemodynamic analyses.