Grayscale and proportion-corrected optical coherence tomography images
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Updated: Sep 26, 2026
Doppler Optical Coherence Tomography of Retinal Circulation
Published on: September 18, 2012
H Ishikawa1, R Gürses-Ozden, S T Hoh
1Department of Ophthalmology, The New York Eye and Ear Infirmary, NY 10003, USA.
Background And 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.
Materials And 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.
