title: A 3-dimensional ultrasound C-scan imaging technique for optic nerve measurements.
abstract: OBJECTIVE
  To evaluate the use of 3-dimensional ultrasound C-scan imaging for optic nerve diameter measurements.
  
  
  METHODS
  Prospective observational case series.
  
  
  METHODS
  Thirty-eight normal eyes of 32 healthy adults.
  
  
  METHODS
  Coronal C-scans of 38 normal optic nerves were imaged 3 mm behind the globe.
  
  
  METHODS
  Optic nerve sheath diameter (ONSD) and optic nerve diameter (OND).
  
  
  RESULTS
  Mean ONSD was 4.8 mm (range: 3.9-5.9; SD 0.6), whereas mean optic OND was 1.9 mm (range: 1.8-2.1; SD 0.1). Mean ONSDs were 4.9 mm (male), 4.5 mm (female), 5.0 mm (subjects younger than 50 years), and 4.6 mm (subjects 50 and older).
  
  
  CONCLUSIONS
  Coronal C-scans generated from 3-dimensional ultrasound can be used to measure the optic nerve diameters in adult eyes.
authors.affiliation: The New York Eye & Ear Infirmary, New York, New York, USA.
authors.forename: Julian P S
authors.initials: JP
authors.lastname: Garcia
authors.forename: Patricia T
authors.initials: PT
authors.lastname: Garcia
authors.forename: Richard B
authors.initials: RB
authors.lastname: Rosen
authors.forename: Paul T
authors.initials: PT
authors.lastname: Finger
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003941:Diagnostic Techniques, Ophthalmological; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009900:Optic Nerve / Q000000981:diagnostic imaging*; D011446:Prospective Studies; D014463:Ultrasonography