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Updated: Jun 5, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

Published on: August 4, 2018

Extra long imaging range swept source optical coherence tomography using re-circulation loops.

Adrian Bradu¹, Liviu Neagu, Adrian Podoleanu

¹Applied Optics Group, School of Physical Sciences, University of Kent, Canterbury, Kent, CT2 7NH, UK. a.bradu@kent.ac.uk

|December 18, 2010

Summary

This summary is machine-generated.

This study introduces a novel swept source optical coherence tomography (SS-OCT) method to significantly extend imaging range. By using adjustable path length rings, the axial range is enhanced beyond laser coherence limits.

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Area of Science:

Optical Engineering
Biomedical Imaging
Metrology

Background:

Swept source optical coherence tomography (SS-OCT) is a powerful imaging technique.
A key limitation of SS-OCT is its restricted axial imaging range, dictated by laser coherence length.

Purpose of the Study:

To propose and investigate a novel interferometer configuration for SS-OCT.
To overcome the inherent axial range limitations in SS-OCT systems.

Main Methods:

A new interferometer design incorporating adjustable path length rings in each arm.
Utilizing semiconductor optical amplifiers to compensate for losses within the re-circulation loops.
Combining multiple A-scans to achieve an extended axial range.

Main Results:

The proposed method effectively extends the axial imaging range of SS-OCT.
The re-circulation loops mimic an extended coherence length of the swept source.
Achieved axial imaging range can exceed centimeters, surpassing conventional limits.

Conclusions:

The novel SS-OCT configuration successfully extends the axial imaging range.
This approach offers a viable solution for deep tissue or large-volume imaging applications.
The method pushes the boundaries of SS-OCT beyond the laser's coherence length limitation.