Recent advances in imaging of cerebrovascular disease.

The recent advances made in CT and MR imaging have led to increased accuracy in making a number of diagnoses in the emergency room setting. Increasingly, radiologists are asked to perform these studies and accurately interpret the findings, which often have a dramatic impact on triaging and treatment of the patient. Future trials need to address further the relative merits of each of the techniques outlined previously in specific settings. In addition, given the increasing number of means of obtaining diagnostic information, cost effectiveness studies are needed to better formulate an appropriate algorithm for each diagnosis.