[Angiographic procedures for determination of cessation of cerebral circulation]. 
In several European countries catheter angiography is permitted as a confirmatory procedure for the determination of irreversible loss of brain function (brain death).  In Germany catheter angiography requires the possibility of a therapeutic implication as a prerequisite.  In the updated German guidelines computed tomography angiography (CTA) has been accredited as a new confirmatory procedure if a standardized protocol and predefined assessment parameters are adhered to.  The CTA can be performed within a few minutes, even in situations with unstable intensive care patients.  Magnetic resonance (MR) angiography has not yet been adequately validated and is not permitted in Germany as a confirmatory procedure for the determination of irreversible loss of brain function.