Optical Coherence Tomography Angiography in Diabetic Maculopathy

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Vascular Diseases

Background:

• Fluorescein angiography (FA) and indocyanine green angiography are established methods for evaluating retinal and choroidal vascular diseases.
• These techniques provide detailed anatomical information but have limitations in visualizing all retinal capillary layers due to light scattering.
• FA is the gold standard for retinal imaging, enabling visualization of capillary beds and their changes.

Purpose of the Study:

• To introduce optical coherence tomography angiography (OCT-A) as a novel imaging modality for retinal and choroidal microvasculature.
• To highlight OCT-A's capability for depth-resolved visualization without intravenous dye injection.
• To emphasize OCT-A's utility in assessing both morphological and functional aspects of retinal vascular diseases.

Main Methods:

• Optical coherence tomography angiography (OCT-A) utilizes the difference between static and non-static tissues to create a vascular decorrelation signal.
• This signal allows for the visualization of 3-dimensional retinal and choroidal vascular networks.
• OCT-A is co-registered with structural optical coherence tomography (OCT) for simultaneous morphological and functional evaluation.

Main Results:

• OCT-A provides depth-resolved visualization of retinal and choroidal microvasculature without the need for intravenous dye injection.
• This dye-free method reduces the risk of adverse events associated with angiography.
• OCT-A enables clear evaluation of morphological findings like macular edema and functional aspects such as capillary drop-out.

Conclusions:

• OCT-A offers a significant advancement in retinal imaging, providing comprehensive 3D vascular visualization.
• The technique facilitates rapid analysis and accurate differentiation of perfused vessels from artifacts, particularly in conditions like diabetic maculopathy.
• OCT-A's morpho-functional assessment aids in determining the origin and clinical activity of vascular diseases.