title: Correlation between cross-sectional shape of choroidal veins and choroidal thickness.
abstract: OBJECTIVE
  To determine whether a significant correlation exists between the ratio of the vertical and horizontal diameters of the choroidal veins and the choroidal thickness in normal eyes.
  
  
  METHODS
  Six clinic-based normal eyes were studied. The macula and retina around the optic disc were examined by spectral-domain optical coherence tomography (OCT) during indocyanine green angiography (IA), and choroidal thickness maps were constructed. The vertical and horizontal diameters of the choroidal veins in the OCT images and horizontal diameters in the IA images in the venous phase were measured at 12 locations of different choroidal thickness. The horizontal diameter of the choroidal veins measured in the OCT images and the corresponding IA images were compared, and the correlation between the ratio of the vertical and horizontal diameters of the choroidal veins and the corresponding choroidal thickness was determined.
  
  
  RESULTS
  The horizontal diameters of the choroidal veins measured in IA and OCT images were not significantly different and were significantly correlated (r = 0.73; P < 0.01). The ratio of the vertical and horizontal diameters of the choroidal veins was significantly correlated with the choroidal thickness (r = 0.85; P < 0.001).
  
  
  CONCLUSIONS
  The significant correlation between the ratio of the vertical and horizontal diameters of the veins to the choroidal thickness should be considered when the cross-sectional area of the choroidal veins is evaluated.
authors.affiliation: Department of Ophthalmology, Nagoya University Graduate School of Medicine, 65 Tsuruma-cho, Showa-ku, Nagoya 466-8550, Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Tanabe
authors.forename: Yasuki
authors.initials: Y
authors.lastname: Ito
authors.forename: Yuko
authors.initials: Y
authors.lastname: Iguchi
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Ozawa
authors.forename: Kohei
authors.initials: K
authors.lastname: Ishikawa
authors.forename: Hiroko
authors.initials: H
authors.lastname: Terasaki
mesh_terms: D001794:Blood Pressure / Q000502:physiology; D002829:Choroid / Q000033:anatomy & histology* / Q000098:blood supply*; D005260:Female; D005451:Fluorescein Angiography; D006801:Humans; D007208:Indocyanine Green; D007429:Intraocular Pressure / Q000502:physiology; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D015203:Reproducibility of Results; D012189:Retrospective Studies; D013223:Statistics as Topic; D041623:Tomography, Optical Coherence; D014680:Veins / Q000033:anatomy & histology*
chemical_list: D007208:Indocyanine Green