title: Sonographic estimates of vein size in the lower extremities: subjective assessment compared with direct measurement.
abstract: OBJECTIVE
  We studied whether subjective impression of vein size is a valid means of assessment during sonographic evaluation for deep vein thrombosis.
  
  
  METHODS
  Diameter was assessed at 5 predetermined venous segments on 975 legs of 721 patients referred for evaluation for lower extremity deep vein thrombosis. The sonographer recorded a subjective assessment of whether the venous segment was enlarged, normal, or narrowed based on a visual impression of sonographic images obtained without compression. This subjective impression was then compared with the absolute measurements of vein diameter and vein diameter:artery diameter ratio at each segment.
  
  
  RESULTS
  A significant correlation was found between the subjective characterization of vein size as enlarged, normal, and narrowed and both the absolute vein diameter and the vein:artery ratio at all 5 segments.
  
  
  CONCLUSIONS
  Vein size can be reliably categorized by the subjective impression of experienced sonographers. Therefore, actual measurement of the vein diameter is not necessary in the evaluation for deep vein thrombosis in the majority of patients.
authors.affiliation: Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA.
authors.forename: B S
authors.initials: BS
authors.lastname: Hertzberg
authors.forename: M A
authors.initials: MA
authors.lastname: Kliewer
authors.forename: D M
authors.initials: DM
authors.lastname: DeLong
authors.forename: K J
authors.initials: KJ
authors.lastname: Lalouche
authors.forename: E K
authors.initials: EK
authors.lastname: Paulson
authors.forename: B A
authors.initials: BA
authors.lastname: Carroll
mesh_terms: D000704:Analysis of Variance; D003251:Constriction, Pathologic / Q000000981:diagnostic imaging / Q000473:pathology; D004108:Dilatation, Pathologic / Q000000981:diagnostic imaging / Q000473:pathology; D005069:Evaluation Studies as Topic; D005263:Femoral Artery / Q000473:pathology; D005268:Femoral Vein / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D007866:Leg / Q000098:blood supply* / Q000000981:diagnostic imaging; D011150:Popliteal Artery / Q000473:pathology; D011152:Popliteal Vein / Q000000981:diagnostic imaging* / Q000473:pathology; D015203:Reproducibility of Results; D013924:Thrombophlebitis / Q000000981:diagnostic imaging* / Q000473:pathology; D018608:Ultrasonography, Doppler