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Related Experiment Video

Updated: Jul 15, 2025

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

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Towards phase-sensitive optical coherence tomography in smart laser osteotomy: temperature feedback.

Arsham Hamidi¹, Yakub A Bayhaqi², Ferda Canbaz²

¹Biomedical Laser and Optics Group (BLOG), Department of Biomedical Engineering, University of Basel, CH-4123, Allschwil, Switzerland. Arsham.hamidi@unibas.ch.

Lasers in Medical Science

|September 26, 2023

Summary

This study shows optical coherence tomography can monitor bone temperature during laser surgery. This technology offers real-time feedback to prevent thermal damage and optimize laser bone ablation.

Keywords:

Laser ablation Laser osteotomy Optical coherence tomography Phase-sensitive OCT

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Area of Science:

Biomedical Engineering
Optical Physics
Surgical Technology

Background:

Thermal effects are a significant challenge in bone surgery, particularly with Er:YAG lasers.
Current irrigation methods for laser bone surgery have limitations, risking either thermal damage or reduced ablation efficiency.

Purpose of the Study:

To investigate the use of phase-sensitive optical coherence tomography (PS-OCT) for real-time temperature monitoring during Er:YAG laser bone ablation.
To correlate tissue temperature rise with photo-thermal expansion using PS-OCT feedback.

Main Methods:

Integrated a PS-OCT system (1.288 μm) with an Er:YAG laser.
Calibrated the PS-OCT system by correlating temperature changes (thermal camera) with cumulative phase changes during laser ablation.
Used calibration coefficients to predict temperature rise in subsequent laser-induced bone cuts.

Main Results:

Achieved an average root-mean-square error of approximately 4°C in predicting temperature rise for laser-induced bone cuts.
Demonstrated the capability of PS-OCT to predict two-dimensional temperature distribution during laser osteotomy.

Conclusions:

The developed PS-OCT method shows potential for providing crucial temperature feedback during laser bone surgery.
This technology could enhance the safety and efficacy of minimally invasive laser osteotomy by controlling thermal effects.