CT: history, technology, and clinical aspects.

The introduction of computerized tomography (CT) revolutionized noninvasive imaging, particularly with regards to the central nervous system. Further advances in CT technology over the past two decades have allowed for more elegant visualization of various bodily structures, including vascular anatomy and organ perfusion physiology. This article will review the development of computerized tomography from conventional machines to multislice helical units, emphasizing relevant advances in stroke imaging and including some discussion of radiation safety.