Combined depth imaging technique on spectral-domain optical coherence tomography

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Imaging

Background:

• Spectral-domain optical coherence tomography (SD OCT) is crucial for visualizing retinal structures.
• Enhanced depth imaging (EDI) OCT improves visualization of deeper tissues like the choroid.
• Simultaneous imaging of both vitreoretinal and choroidal layers presents a challenge.

Purpose of the Study:

• To introduce and describe a novel combined depth imaging (CDI) OCT technique.
• To evaluate the applicability of CDI OCT in normal eyes.
• To assess the limitations and performance of CDI OCT in eyes with cataract.

Main Methods:

• A prospective, observational case series was conducted.
• Three OCT methods were used: conventional SD OCT, EDI OCT, and CDI OCT.
• CDI OCT involved manual image processing to enhance vitreoretinal and choroidal visualization, averaging 100 scans.

Main Results:

• CDI OCT successfully produced high-quality combined images in all eyes, including those with cataracts.
• Independent masked observers showed high agreement in grading CDI OCT images.
• CDI OCT demonstrated superiority in visualizing both vitreoretinal and choroidal structures compared to conventional SD OCT and EDI OCT.

Conclusions:

• The manual CDI OCT technique is highly sensitive for visualizing posterior vitreoretinal and choroidal structures.
• CDI OCT provides a single, full-depth image of these posterior eye structures.
• The technique's effectiveness is not compromised by mild to moderate cataracts.