Propective evaluation of suspected stenoocclusive disease of the intracranial artery: combined MR angiography and CT angiography compared with digital subtraction angiography. - Hirai,T.; Korogi,Y.; Ono,K.; Nagano,M.; Marouka,K.; Uemura,S.; Takahashi,M. (AJNR Am J Neuroradiol, 2002)