OCTinterpretationshows:

increased retinal thickness with (loss of foveal contour ) throughout the macula and most prominently nasal to the center.

A large cyst was identified directly in the fovea, with two smaller surrounding cysts

cystoid macular edema, and retinal thickening inferior to the center.

lntraretinal hemorrhage was identified inferiorly by its shadowing of the reflections from the outer retina.

The blood appeared highly backscattering and almost indistinguishable from the retinal nerve fiber layer, but was identified by the reduced reflections in that area from the retinal pigment epithelium and choroid.

OCTinterpretation Conclusion:

CME with intraretinal hemorrhage consistent with BRVO seen in fundus and FFA photos

OCT interpretation capsules Powerpoint Presentation :

Interpretation of the OCT Image (and some new developments) B. Jeroen Klevering University Medical Centre Nijmegen – The Netherlands

OCT – Introduction and Macular disorders

1. Dr. Sajjan Sangai Dept. Of Ophthalmology MGM Medical College and Hospital, Aurangabad
2. Retina is a multi layered tissue with each layer having a different reflectance pattern thus by this principleOCT permits recognition of multiple retinal layers in vivo.
3. Optical Related to light and optics Coherence Two light beams of the same wavelength in phase Tomography Sectioning /Cutting
4. Horizontal Structures • Inner and Outer Plexiform layer • Inner and Outer Limiting Membrane • Pigment epithelium Vertical Structures • Müllers fibres • Cell chains containing of photoreceptor to bipolar and ganglion cells
5. Imaging with OCT is based on Michelson’s Interferometer and includes complex analysis of reflections of LOW COHERENCE LIGHT from the ocular tissue ( low coherence interferometry)
6. Low coherence infrared light 840 nm Reflected by different retinal tissue layers
7. The reflected light from the retinal tissue and reference mirror interacts to form an Step 3 Distance between the light source and reference mirror Step 2 Distance between the light source and retinal tissue Step 1 INTERFERENCE PATTERN This interference pattern is processed into a signal
8. The signal is analogous to that obtained with A Scan Ultrasonography.  A 2D image is built as the light source is moved across the retina and then the series of stacked and aligned A scans produce a 2dimensional cross sectional image resembling a HISTOLOGIC SECTION
9. Transverse scanning at multiple sequential points (A-Scans) 2 Dimensional data collection Generation of Cross sectional map Display in pseudo colours
10. The infrared image has a field of 30˚ .  OCT operates like a fundus camera but resolves like a USG machine . USG OCT Source Sound waves Infrared light waves Resolution 150µ 10µ Patient Contact Needed Non- Invasive

OCT interpretation capsules videos:

OCT: Interpreting the image video

OCT interpretation capsules