a test that uses dye in the blood stream and X-ray images to show 
                                                            
                                                     
                        
                                                
                        
                        
                            a diagnostic test that produces an image of the arteries in the brain and/or head. It can help physicians diagnose a number of problems.
                                                            
                                                     
                        
                                                
                        
                        
                            A scan showing the veins in the brain
                                                            
                                                     
                        
                                                
                        
                        
                            A procedure of visualization of blood vessels of the brain, using x-rays taken after injection of radiopaque material into the arterial blood stream.