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Related Experiment Video

Updated: May 23, 2025

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Published on: January 15, 2013

Visible light polarization-sensitive optical coherence tomography with balanced detection.

Bahar Baradaran¹, Adam J Black¹, Sarah R Heilbronner²

¹University of Minnesota, Department of Biomedical Engineering, Minneapolis, Minnesota, United States.

Journal of Biomedical Optics

|March 12, 2025

Summary

This summary is machine-generated.

We developed a high-resolution visible-light polarization-sensitive optical coherence tomography (PS-OCT) system. This advanced imaging technology enhances signal-to-noise ratio and birefringence sensitivity for clearer visualization of biological tissues.

Keywords:

axis orientation birefringence polarization-maintaining fiber retardance

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Published on: August 4, 2018

Area of Science:

Biomedical Optics
Optical Imaging
Coherent Tomography

Background:

Visible-light optical coherence tomography (OCT) offers high resolution but can be limited by signal-to-noise ratio (SNR) and birefringence sensitivity.
Polarization-sensitive OCT (PS-OCT) provides contrast based on tissue birefringence, crucial for visualizing structures like collagen fibers.

Purpose of the Study:

To implement and characterize a novel visible-light PS-OCT system with balanced detection (BD).
To evaluate the system's performance for imaging biological tissues, focusing on spatial resolution and birefringence sensitivity.

Main Methods:

A spectral-domain PS-OCT system was designed using a unique interferometer and custom spectrometer.
Balanced detection (BD) was implemented by capturing four aligned spectra with a single camera, enabling subtraction for improved SNR.
System performance was characterized by measuring axial resolution, BD performance, and retardance measurements using a variable retarder.

Main Results:

The system achieved high-resolution visible-light PS-OCT with effective balanced detection.
Improved signal-to-noise ratio (SNR) and birefringence sensitivity were demonstrated.
Imaging of biological tissues showed enhanced delineation of birefringent structures.

Conclusions:

The implemented BD for high-resolution visible-light PS-OCT significantly improves SNR and birefringence sensitivity.
This advancement enables better visualization of birefringent structures in biological tissues.
The system offers new opportunities for biomedical imaging, particularly for resolving fibrous structures.