"It is also crucial to note that the timing of the study is different to a normal diagnostic study where the aim is to image as early as possible during the arterial phase to avoid excessive venous opacification. When intracranial perfusion is abnormal, such a routine study may result in false positives 15. Thus it is recommended that CT angiography in this setting is delayed to 60 seconds post-injection to allow even the slowest perfusion to be detected 15. In some cases, persistent contrast filling within the proximal cerebral arteries but not in the cortical branches may be demonstrated (stasis filling), which does not reflect true cerebral perfusion 16."
"Although CT may demonstrate extensive ischaemic damage (e.g. reversal sign, pseudosubarachnoid haemorrhage, cerebral oedema, and herniation), as these are more or less subjective, only CT angiography is recognised as a potential alternative to angiography and nuclear medicine studies in some jurisdictions 13-15."
"UK 2023 Consensus"
"UK 2023 Consensus"
"In 2023 various UK bodies including the Faculty of Intensive Care Medicine, British Society of Neuroradiologists and the RCR published a consensus document on the use of CT angiography as ancillary testing for death by neurological criteria (DNC) 17,18. This is recommended when a comprehensive neurological examination or confounding conditions cannot be performed or excluded. This imaging assessment uses the 4-point criteria described by Frampas 3."
"In 2023 various UK bodies including the Faculty of Intensive Care Medicine, British Society of Neuroradiologists and the RCR published a consensus document on the use of CT angiography as ancillary testing for death by neurological criteria (DNC) 17,18. This is recommended when a comprehensive neurological examination or confounding conditions cannot be performed or excluded. This imaging assessment uses the 4-point criteria described by Frampas 3."
Expected headings
"UK 2023 Consensus"
"Cerebral perfusion"
"flow images are obtained in the anterior projection; delayed images follow 5 to 10 minutes after the injection"