title: Internal carotid blood flow and cerebral hemispheric perfusion in patients with subarachnoid haemorrhage: a study of the quantix/NDtrade mark system and CT perfusion technology.
abstract: OBJECTIVE
  To assess whether carotid blood flow measurements predict abnormalities in cerebral hemispheric perfusion.
  
  
  METHODS
  The Quantix/NDTM system was used to measure carotid artery blood flow in nine patients with subarachnoid haemorrhage who underwent CT perfusion scanning.
  
  
  RESULTS
  No significant correlation was found between internal carotid artery blood flow and ipsilateral cerebral hemispheric perfusion (013, p>0.05) but there was a statistically significant correlation between total internal carotid and global cerebral perfusion (0.63, p<0.05).
  
  
  CONCLUSIONS
  This is the first report comparing the Quantix/NDTM system with CT perfusion. Our data do not show a statistically significant correlation between extracranial blood flow and cerebral hemispheric perfusion. This is in contrast to two previous studies where Quantix/NDTM measurements were compared with measurements of cerebral perfusion using the Xenon clearance technique.
authors.affiliation: Department of Human Anatomy & Genetics, Haywards Heath, West Susex, University of Oxford, UK.
authors.forename: R D
authors.initials: RD
authors.lastname: Johnson
authors.forename: W A
authors.initials: WA
authors.lastname: Liebenberg
authors.forename: R
authors.initials: R
authors.lastname: Jones
authors.forename: G
authors.initials: G
authors.lastname: Critchley
mesh_terms: D002343:Carotid Artery, Internal / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D006801:Humans; D011237:Predictive Value of Tests; D012039:Regional Blood Flow / Q000502:physiology; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014057:Tomography, X-Ray Computed; D018617:Ultrasonography, Doppler, Pulsed / Q000295:instrumentation*