En-Face Imaging of Microcysts in Macular Teleangiectasia Type 2 Using Minimum- and Mean-Intensity Projections

Abstract

 

Purpose

 

This study is to demonstrate visualization of microcysts in cases of macular teleangiectasia type 2 (MacTel2) using en-face imaging, and to compare minimum-intensity projection with typical mean-intensity projection en-face imaging for the detection of these microcysts.

 

Methods

 

Data from patients with MacTel2 were gathered from a prototype swept-source OCT system. These image volumes were processed offline to create two types of en-face images, one using the mean intensity between the ILM and RPE segmentations, and another using the minimum intensity of the speckle-reduced image between the ILM and RPE segmentations. Apparent microcysts in the en-face images were verified by viewing the B-scans through those locations.

 

Results

 

Microcysts were found in 10 out of 35 eyes using standard mean-intensity projections and 15 out of 35 eyes using minimum-intensity projections.

 

Conclusions

 

Microcysts are commonly found in cases of MacTel2. The minimum-intensity projection allows better detection of these microcysts than standard en-face imaging.  

 

Comparison of minimum- and mean-intensity projections for en-face imaging of microcysts (example indicated in red circle).