Grayscale and proportion-corrected optical coherence tomography images.
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.
Ishikawa
H
H
Department of Ophthalmology, The New York Eye and Ear Infirmary, NY 10003, USA.
Gürses-Ozden
R
R
Hoh
S T
ST
Dou
H L
HL
Liebmann
J M
JM
Ritch
R
R
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