title: C-arm CT measurement of cerebral blood volume in ischemic stroke: an experimental study in canines.
abstract: OBJECTIVE
  CBV is a key parameter in distinguishing penumbra from ischemic core. The purpose of this study was to compare CBV measurements acquired with standard PCT with ones obtained with C-arm CT in a canine stroke model.
  
  
  METHODS
  Under an institutionally approved protocol, unilateral MCA strokes were created in 10 canines. Four hours later, DWI was used to confirm the presence of an infarct. CBV maps acquired with PCT were compared with ones acquired by using C-arm CT. Three experienced observers, blinded to the technique used for acquisition, evaluated the CBV maps.
  
  
  RESULTS
  An ischemic stroke was achieved in 9 of the 10 animals. Areas of reduced CBV were detected in 70%-75% of the PCT studies and in 83%-87% of the C-arm CT examinations, with false-positives in 1.7% and 3.3%, respectively. False-negatives were found in 25% of the PCT and 12.2% of the C-arm CT studies. In all studies, there was a significant difference between the absolute CBV values in normal and abnormal tissue (P < .005) and no significant difference between PCT and C-arm CT CBV values in either the normal or the abnormal parenchyma (P > .05).
  
  
  CONCLUSIONS
  CBV measurements made with C-arm CT compare well with ones made with PCT. While further work is required both to fully validate the technique and to define its ultimate clinical value, it appears that it offers a feasible method for assessing CBV in the angiography suite.
authors.affiliation: University of Wisconsin Hospitals and Clinics, Madison, Wisconsin, USA.
authors.forename: T
authors.initials: T
authors.lastname: Bley
authors.forename: C M
authors.initials: CM
authors.lastname: Strother
authors.forename: K
authors.initials: K
authors.lastname: Pulfer
authors.forename: K
authors.initials: K
authors.lastname: Royalty
authors.forename: M
authors.initials: M
authors.lastname: Zellerhoff
authors.forename: Y
authors.initials: Y
authors.lastname: Deuerling-Zheng
authors.forename: F
authors.initials: F
authors.lastname: Bender
authors.forename: D
authors.initials: D
authors.lastname: Consigny
authors.forename: R
authors.initials: R
authors.lastname: Yasuda
authors.forename: D
authors.initials: D
authors.lastname: Niemann
mesh_terms: D000208:Acute Disease; D000818:Animals; D001811:Blood Volume Determination / Q000379:methods*; D002545:Brain Ischemia / Q000000981:diagnostic imaging*; D002533:Cerebral Angiography / Q000379:methods / Q000592:standards; D002560:Cerebrovascular Circulation; D004195:Disease Models, Animal; D004285:Dogs; D005188:False Negative Reactions; D005189:False Positive Reactions; D020521:Stroke / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods* / Q000592:standards