Negative CT Angiography Findings in Patients with Spontaneous Subarachnoid Hemorrhage: When is Digital Subtraction Angiography Still Needed?
AJNR 31:695-705, Agid,R., et al, 2010
CT Angiography in Dissections of the Internal Carotid Artery. Value of a New Examination Technique in Comparison with DSA and Doppler Ultrasound.
Radiologe 36:850-854, Egelhof,T.,et al, 1996