title: Value of subtraction in brachiocephalic angiography.
mesh_terms: D000792:Angiography / Q000379:methods; D016122:Brachiocephalic Trunk / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013382:Subtraction Technique; D014711:Vertebral Artery / Q000000981:diagnostic imaging