Choroidal imaging using optical coherence tomography: techniques and interpretations.

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Science

Background:

• The choroid, vital for retinal health, is challenging to visualize with traditional methods.
• Optical coherence tomography (OCT) has revolutionized choroidal imaging over the past two decades.
• Enhanced-depth imaging and swept-source OCT offer detailed views of choroidal structure.

Purpose of the Study:

• To review recent advancements in choroidal imaging processing techniques.
• To explain the interpretation of results for imaging experts and ophthalmologists.
• To highlight the importance of image processing for quantitative analysis of choroidal vasculature.

Main Methods:

• Review of current literature on choroidal imaging processing.
• Discussion of techniques like OCT angiography (OCTA) for blood flow visualization.
• Exploration of image-processing methods including segmentation and binarization for structural analysis.
• Mention of 3D visualization using high-speed volumetric OCT.

Main Results:

• OCT and OCT angiography (OCTA) enable visualization of choroidal vasculature.
• Image processing techniques are essential for extracting structural information from OCT images.
• Manual or automated segmentation and binarization aid in choroidal vessel evaluation.
• Despite advancements, quantitative analysis often requires manual physician intervention due to insufficient built-in functions.

Conclusions:

• Advanced OCT techniques significantly improve choroidal visualization.
• Image processing is critical for detailed structural and quantitative analysis of choroidal vessels.
• Further development in automated analysis tools is needed to support ophthalmologists in clinical practice.