Enhanced depolarization contrast in polarization-sensitive optical coherence tomography

Area of Science:

• Biomedical Optics
• Medical Imaging
• Optical Physics

Background:

• Polarization-sensitive optical coherence tomography (PS-OCT) is vital for imaging tissue birefringence.
• Current methods like Degree of Polarization Uniformity (DOPU) have limitations regarding incident polarization states and system parameters.
• There is a need for more robust depolarization imaging metrics in PS-OCT.

Purpose of the Study:

• To introduce and validate the differential depolarization index (DDI) for depolarization imaging in PS-OCT.
• To compare the performance of DDI against DOPU in various imaging scenarios.
• To demonstrate DDI's applicability to single-input-polarization-state PS-OCT systems.

Main Methods:

• Application of the differential depolarization index (DDI) in PS-OCT.
• Comparative analysis of DDI and DOPU using tissue phantoms.
• Validation of DDI performance on human skin samples.
• Assessment of DDI's independence from incident polarization states.

Main Results:

• DDI demonstrated superior depolarization contrast compared to DOPU.
• DDI proved robust to variations in system and sample parameters.
• The index successfully functioned in single-input-polarization-state PS-OCT configurations.
• Significant improvements in depolarization contrast were observed in tissue phantoms and human skin.

Conclusions:

• The differential depolarization index (DDI) is a promising new metric for PS-OCT.
• DDI overcomes limitations of existing methods, offering enhanced depolarization contrast.
• Its robustness and applicability to single-input systems highlight its potential for advanced biomedical imaging.