title: Assessment of intracranial collateral flow by using dynamic arterial spin labeling MRA and transcranial color-coded duplex ultrasound.
abstract: OBJECTIVE
  To evaluate the potential of a new dynamic MRA sequence (DynAngio) based on arterial spin labeling for the assessment of intracranial collateral flow.
  
  
  METHODS
  Twelve patients with unilateral internal carotid artery obstruction were investigated. Different patterns of collateral flow were compared between DynAngio, transcranial color-coded duplex ultrasound, and time-of-flight MRA.
  
  
  RESULTS
  There was a good agreement between the methods, with sensitivities between 80% and 90%. Small collateral vessels were detected more frequently with DynAngio compared to time-of-flight MRA.
  
  
  CONCLUSIONS
  DynAngio provides anatomic and similar to transcranial color-coded duplex ultrasound functional information on collateral flow for the assessment of intracranial hemodynamics.
authors.affiliation: Department of Neurology, Universitätsklinikum Mannheim, University of Heidelberg, 68135 Mannheim, Germany.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Sallustio
authors.forename: Rolf
authors.initials: R
authors.lastname: Kern
authors.forename: Matthias
authors.initials: M
authors.lastname: Günther
authors.forename: Kristina
authors.initials: K
authors.lastname: Szabo
authors.forename: Martin
authors.initials: M
authors.lastname: Griebe
authors.forename: Stephen
authors.initials: S
authors.lastname: Meairs
authors.forename: Michael
authors.initials: M
authors.lastname: Hennerici
authors.forename: Achim
authors.initials: A
authors.lastname: Gass
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001921:Brain / Q000098:blood supply / Q000503:physiopathology; D002545:Brain Ischemia / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology; D016893:Carotid Stenosis / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000503:physiopathology; D002536:Cerebral Arteries / Q000033:anatomy & histology* / Q000000981:diagnostic imaging* / Q000502:physiology; D002560:Cerebrovascular Circulation / Q000502:physiology; D005260:Female; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D020521:Stroke / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology; D017585:Ultrasonography, Doppler, Transcranial / Q000379:methods*