title: Novel dynamic four-dimensional CT angiography revealing 2-type motions of cerebral arteries.
abstract: OBJECTIVE
  We developed a novel dynamic 4-dimensional CT angiography to accurately evaluate dynamics in cerebral aneurysm.
  
  
  METHODS
  Dynamic 4-dimensional CT angiography achieved high-resolution 3-dimensional imaging with temporal resolution in a beating heart using dynamic scanning data sets reconstructed with a retrospective simulated R-R interval reconstruction algorithm.
  
  
  RESULTS
  Movie artifacts disappeared on dynamic 4-dimensional CT angiography movies of 2 kinds of stationary phantoms (titanium clips and dry bone). In the virtual pulsating aneurysm model, pulsation on the dynamic 4-dimensional CT angiography movie resembled actual movement in terms of pulsation size. In a clinical study, dynamic 4-dimensional CT angiography showed 2-type motions: pulsation and anatomic positional changes of the cerebral artery.
  
  
  CONCLUSIONS
  This newly developed 4-dimensional visualizing technique may deliver some clues to clarify the pathophysiology of cerebral aneurysms.
authors.affiliation: Department of Neurosurgery, Mie University School of Medicine, Tsu, Japan 2-174. umedokodemodoor@mac.com
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Umeda
authors.forename: Fujimaro
authors.initials: F
authors.lastname: Ishida
authors.forename: Kazuhide
authors.initials: K
authors.lastname: Hamada
authors.forename: Keiji
authors.initials: K
authors.lastname: Fukazawa
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Miura
authors.forename: Naoki
authors.initials: N
authors.lastname: Toma
authors.forename: Hidenori
authors.initials: H
authors.lastname: Suzuki
authors.forename: Satoshi
authors.initials: S
authors.lastname: Matsushima
authors.forename: Shinichi
authors.initials: S
authors.lastname: Shimosaka
authors.forename: Waro
authors.initials: W
authors.lastname: Taki
mesh_terms: D002533:Cerebral Angiography / Q000379:methods*; D002536:Cerebral Arteries / Q000000981:diagnostic imaging* / Q000503:physiopathology; D056973:Four-Dimensional Computed Tomography / Q000379:methods*; D006801:Humans; D002532:Intracranial Aneurysm / Q000175:diagnosis* / Q000000981:diagnostic imaging* / Q000503:physiopathology; D012189:Retrospective Studies