title: Construction of Optimal Velocity Encoding for Cerebral Blood Flow Volume Measurement with Phase-Contrast MRA.
abstract: OBJECTIVE
  Accurate velocity encoding is crucial for quantification of arterial inflow and venous outflow in intracranial diseases. The purpose of this study was to optimize the velocity encoding of phase-contrast (PC) MRA and quantify cerebral blood flow in normal volunteers.
  
  
  METHODS
  Ten healthy volunteers were examined on a GE 1.5T MR system with 2D PCMRA sequence. The parameters of the sequence were as follows: TR 40ms, TE 6.6ms, flip angle 20&#176;, slice thickness 4mm, matrix 256x256, field of view 140 mm. In each cardiac cycle, 40 images were obtained. Velocity encoding was set from 30 to 90 cm/sec at 10cm/sec interval for total of 7 scans per volunteer. The scan level was chosen at C2 perpendicular to the vessels of interest. Data were analyzed using CV Flow software on a GE Advantage Windows Workstation.
authors.affiliation: Department of Medical Imaging, Shantou University Medical College, Shantou 515041, China; Department of Neuroradiology, Toronto Western Hospital, University of Toronto, Toronto, ON M5T 2S8, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Guo
authors.forename: R H
authors.initials: RH
authors.lastname: Wu
authors.forename: D J
authors.initials: DJ
authors.lastname: Mikulis