Time-domain full-field optical coherence tomography with digital confocal line scanning

Area of Science:

• Biomedical optics
• Microscopy techniques
• Optical imaging

Background:

• Full-field optical coherence tomography (FF-OCT) offers high spatial resolution for deep tissue imaging.
• The lack of confocal gating in FF-OCT limits imaging depth due to scattered light.
• Interferometric microscopy techniques are crucial for non-invasive biological sample analysis.

Purpose of the Study:

• To implement digital confocal line scanning in time-domain FF-OCT.
• To overcome the depth limitation of FF-OCT by introducing confocal gating.
• To enhance the signal-to-noise ratio (SNR) for improved imaging in scattering samples.

Main Methods:

• Utilized a rolling-shutter camera's row-by-row detection for digital confocal line scanning.
• Employed a digital micromirror device (DMD) for synchronized line illumination.
• Integrated DMD with FF-OCT system for time-domain imaging.

Main Results:

• Demonstrated an order of magnitude improvement in SNR.
• Successfully imaged a US Air Force (USAF) target behind a scattering layer.
• Validated the effectiveness of digital confocal line scanning in FF-OCT.

Conclusions:

• Digital confocal line scanning significantly enhances FF-OCT performance in scattering media.
• The developed method improves SNR and imaging depth capabilities.
• This technique holds promise for advanced biomedical imaging applications.