Conical scan pattern for enhanced visualization of the human cornea using polarization-sensitive OCT.

Area of Science:

• Ophthalmology
• Biomedical Optics
• Medical Imaging

Background:

• Conventional optical coherence tomography (OCT) uses telecentric scanning, leading to oblique beam angles relative to the cornea.
• This obliquity causes low signal intensity and inhomogeneous corneal structure appearance in OCT images.
• Polarization-sensitive OCT (PS-OCT) data is also affected by these angle-dependent polarization state alterations.

Purpose of the Study:

• To develop and evaluate a novel conical scanning optics design for OCT.
• To minimize the impact of corneal shape on intensity and polarization-sensitive OCT data.
• To improve the quality and reliability of human cornea imaging using PS-OCT.

Main Methods:

• Development of a conical scanning optics system for OCT.
• Comparison of imaging results from the new conical scanning system and conventional telecentric scanning.
• Acquisition and analysis of polarization-sensitive OCT data from the human cornea in healthy volunteers.

Main Results:

• The conical scanning design ensures imaging beams are nearly orthogonal to the corneal surface.
• This orthogonality results in high signal intensity across the entire imaged corneal volume.
• The influence of corneal shape on polarization-sensitive data is substantially reduced compared to conventional methods.

Conclusions:

• The conical scanning optics design offers a significant advancement for PS-OCT of the human cornea.
• This approach overcomes limitations associated with conventional telecentric scanning and corneal geometry.
• It enables more accurate and artifact-free imaging of corneal structures and properties.