Image enhancement with magnification and subtraction.
D001927:Brain Diseases / Q000000981:diagnostic imaging; D001932:Brain Neoplasms / Q000000981:diagnostic imaging; D002533:Cerebral Angiography; D002543:Cerebral Hemorrhage / Q000000981:diagnostic imaging; D003560:Cysts / Q000000981:diagnostic imaging; D006801:Humans; D011856:Radiographic Image Enhancement; D011858:Radiographic Magnification / Q000295:instrumentation; D013382:Subtraction Technique / Q000295:instrumentation; D013679:Technology, Radiologic