title: Transition of the craniocaudal velocity of the spinal cord: from cervical segment to lumbar enlargement.
abstract: OBJECTIVE
  The authors investigate the craniocaudal velocity of the spinal cord over its full length by using magnetic resonance imaging.
  
  
  METHODS
  A spin-echo pulse sequence with velocity encoding gradients was used to examine five normal volunteers. Oblique-axial phase images at nine levels, from cervical spinal cord to lumbar enlargement, were obtained with prospective electrocardiogram gating. Time-velocity curves were then generated for these levels.
  
  
  RESULTS
  Every part of the spinal cord moves first caudally after the R-wave of the electrocardiogram, then cranially. When compared with the cranial levels, peak velocity tend to occur later and their values tend to be smaller at the more caudal levels.
  
  
  CONCLUSIONS
  Craniocaudal velocity is transmitted from cervical segment to lumbar enlargement.
authors.affiliation: Department of Radiology, Osaka University Medical School, Suita, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tanaka
authors.forename: K
authors.initials: K
authors.lastname: Sakurai
authors.forename: N
authors.initials: N
authors.lastname: Kashiwagi
authors.forename: N
authors.initials: N
authors.lastname: Fujita
authors.forename: N
authors.initials: N
authors.lastname: Hirabuki
authors.forename: F
authors.initials: F
authors.lastname: Inaba
authors.forename: K
authors.initials: K
authors.lastname: Harada
authors.forename: H
authors.initials: H
authors.lastname: Nakamura
mesh_terms: D000328:Adult; D004562:Electrocardiography; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D019047:Phantoms, Imaging; D013116:Spinal Cord / Q000000981:diagnostic imaging / Q000502:physiology*; D014463:Ultrasonography