Simulating vascular leakage on optical coherence tomography angiography using an overlay technique with corresponding...

Area of Science:

• Ophthalmology
• Medical Imaging
• Diabetic Retinopathy Research

Background:

• Diabetic macular edema (DME) is a leading cause of vision loss in diabetic patients.
• Accurate detection of microvascular leakage is crucial for managing DME.
• Optical coherence tomography angiography (OCTA) is an emerging imaging technique for retinal vasculature.

Purpose of the Study:

• To evaluate a technique for simulating leakage in DME using OCTA.
• To determine the sensitivity and positive predictive value of OCTA in detecting leaking microvasculature.
• To compare OCTA's diagnostic performance against fluorescein angiography (FA) as the gold standard.

Main Methods:

• OCT angiograms (6x6 mm) were overlaid with OCT thickness maps to identify areas of leakage.
• Abnormalities underlying thickened retinal areas on OCT maps were presumed to be leaking.
• Two independent readers assessed OCTA and FA images for leaking microvasculature, comparing results.

Main Results:

• A total of 28 eyes from 19 diabetic patients were analyzed.
• OCTA detected an average of 7 leaking abnormalities per eye, while FA detected 22.
• OCTA showed a sensitivity of 26.1% and a positive predictive value of 68.4% for leakage detection.

Conclusions:

• OCTA can simulate leakage in DME, but its current sensitivity is limited.
• Further advancements in OCTA technology may offer improved methods for detecting retinal pathologies.
• FA remains a more sensitive tool for identifying microvascular leakage in DME.