title: Grayscale and proportion-corrected optical coherence tomography images.
abstract: OBJECTIVE
  The commercially available optical coherence tomography (OCT) scanner displays images in a pre-set window regardless of the projected scan length on the retinal surface. The aim of this study was to demonstrate the true dimensions of proportion-corrected OCT images and the additional information present in grayscale images.
  
  
  METHODS
  OCT raw data were exported to an IBM-compatible PC and processed to show grayscale and proportion-corrected images using an automated software of our own design.
  
  
  RESULTS
  Eyes with cystoid macular edema and retinal pigment detachment were analyzed. Grayscale images showed a finer gradation of signal reflectance. Scan lengths of 2, 4, 6, and 8 mm on the retinal surface showed different qualitative appearances using proportion-corrected software from the printed or on-screen images.
  
  
  CONCLUSIONS
  Grayscale OCT images can be used to demonstrate additional information not present in false-color images. The disparity between the standard OCT image format and proportion-corrected images emphasizes the need for quantitative rather than qualitative evaluation of retinal dimensions and internal reflectance.
authors.affiliation: Department of Ophthalmology, The New York Eye and Ear Infirmary, NY 10003, USA.
authors.forename: H
authors.initials: H
authors.lastname: Ishikawa
authors.forename: R
authors.initials: R
authors.lastname: Gürses-Ozden
authors.forename: S T
authors.initials: ST
authors.lastname: Hoh
authors.forename: H L
authors.initials: HL
authors.lastname: Dou
authors.forename: J M
authors.initials: JM
authors.lastname: Liebmann
authors.forename: R
authors.initials: R
authors.lastname: Ritch
mesh_terms: D000465:Algorithms; D003941:Diagnostic Techniques, Ophthalmological; D006801:Humans; D007368:Interferometry; D008027:Light; D008269:Macular Edema / Q000473:pathology; D010857:Pigment Epithelium of Eye / Q000473:pathology; D012160:Retina / Q000473:pathology*; D012163:Retinal Detachment / Q000473:pathology; D014054:Tomography / Q000379:methods* / Q000592:standards