Effects of Radiation Exposure on the Cost-Effectiveness of CT Angiography and Perfusion Imaging in Aneurysmal Subarachnoid Hemorrhage ===================================================================================================================================== * J. Ivanidze * R.A. Charalel * I. Shuryak * D. Brenner * A. Pandya * O.N. Kallas * K. Kesavabhotla * A.Z. Segal * M.S. Simon * P.C. Sanelli