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Related Experiment Video

Updated: Jun 6, 2026

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

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Optical deflection tomography with the phase-shifting schlieren.

Didier Beghuin¹, Jean-Luc Dewandel, Luc Joannes

¹Lambda-X SA, 37, Rue de l'Industrie, B-1400 Nivelles, Belgium.

|November 18, 2010

Summary

We developed a new optical tomography method using phase-shifting schlieren for 3D imaging. This technique achieves 35 μm resolution for sparse objects with significant refractive index changes.

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Area of Science:

Optical Physics
Tomography
Imaging Science

Background:

Optical deflection tomography is crucial for visualizing objects with varying refractive indices.
Phase-shifting schlieren techniques offer enhanced sensitivity in optical measurements.

Purpose of the Study:

To introduce a novel optical deflection tomography method.
To enable high-resolution 3D imaging of sparse objects with large refractive index variations.

Main Methods:

Utilizing phase-shifting schlieren for optical deflection measurements.
Employing filtered backprojection for image reconstruction.
Developing a specialized instrument for 3D imaging.

Main Results:

Achieved a spatial resolution of 35 μm.
Demonstrated a depth of field of 3 mm.
Successfully imaged a fiber bundle in a matching index solution.

Conclusions:

The proposed phase-shifting schlieren optical deflection tomography is effective for 3D imaging.
The method provides high resolution for challenging sparse objects.
The technique shows promise for various scientific and industrial applications.