TY - GEN
T1 - Imaging photothermal-induced expansion of bone during laser osteotomy by phase-sensitive OCT
T2 - Biomedical Spectroscopy, Microscopy, and Imaging 2020
AU - Hamidi, Arsham
AU - Bayhaqi, Yakub A.
AU - Canbaz, Ferda
AU - Navarini, Alexander
AU - Cattin, Philippe C.
AU - Zam, Azhar
N1 - Publisher Copyright:
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
PY - 2020
Y1 - 2020
N2 - Lasers have introduced many advantages to the medical field of osteotomy (bone cutting), however, they are not without drawbacks. The thermal side effects of laser osteotomy, in particular, affect a patient's healing process. Employing an irrigation system during surgery is a standard solution for reducing thermal damage to the surrounding tissue, but, due to the high absorption peak of water at the wavelength of Er:YAG laser (2.96 μm), accumulated water acts as a blocking layer and reduces the ablation efficiency. Therefore, irrigation systems would benefit from a high-speed and accurate feedback system to monitor the temperature changes in the tissue of interest. Phase-sensitive optical coherence tomography (PhS-OCT) is a highly sensitive method for measuring internal displacement (photothermal-induced expansion) during laser surgery. In this study, we utilized the integrated swept source PhS-OCT system (operating at a central wavelength of 1314 nm and with an imaging-speed of 104,000 A-scans/s) with an Er:YAG laser to detect localized phase changes induced by laser ablation irradiation and thereby quantify the photothermal-induced expansion of bone. The PhS-OCT system was calibrated by measuring the phase changes corresponding to the displacement of cover glass attached to a piezoelectric actuator (PA4HEW, Thorlabs) at different operating voltages. Furthermore, we explored how the induced photothermal expansion of bone changes when irradiated by different pulse energies. Using a PhS-OCT system to spatially and temporally resolve measurements of axial displacement of bone during laser surgery can play an important role in determining the corresponding temperature map, which can, in turn, offer feedback to the irrigation system in smart laser osteotomy.
AB - Lasers have introduced many advantages to the medical field of osteotomy (bone cutting), however, they are not without drawbacks. The thermal side effects of laser osteotomy, in particular, affect a patient's healing process. Employing an irrigation system during surgery is a standard solution for reducing thermal damage to the surrounding tissue, but, due to the high absorption peak of water at the wavelength of Er:YAG laser (2.96 μm), accumulated water acts as a blocking layer and reduces the ablation efficiency. Therefore, irrigation systems would benefit from a high-speed and accurate feedback system to monitor the temperature changes in the tissue of interest. Phase-sensitive optical coherence tomography (PhS-OCT) is a highly sensitive method for measuring internal displacement (photothermal-induced expansion) during laser surgery. In this study, we utilized the integrated swept source PhS-OCT system (operating at a central wavelength of 1314 nm and with an imaging-speed of 104,000 A-scans/s) with an Er:YAG laser to detect localized phase changes induced by laser ablation irradiation and thereby quantify the photothermal-induced expansion of bone. The PhS-OCT system was calibrated by measuring the phase changes corresponding to the displacement of cover glass attached to a piezoelectric actuator (PA4HEW, Thorlabs) at different operating voltages. Furthermore, we explored how the induced photothermal expansion of bone changes when irradiated by different pulse energies. Using a PhS-OCT system to spatially and temporally resolve measurements of axial displacement of bone during laser surgery can play an important role in determining the corresponding temperature map, which can, in turn, offer feedback to the irrigation system in smart laser osteotomy.
KW - Optical coherence tomography
KW - Phase-sensitive OCT
KW - Photothermal-induced expansion
KW - Smart laser osteotomy
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U2 - 10.1117/12.2555675
DO - 10.1117/12.2555675
M3 - Conference contribution
AN - SCOPUS:85090393758
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Biomedical Spectroscopy, Microscopy, and Imaging
A2 - Popp, Jurgen
A2 - Gergely, Csilla
PB - SPIE
Y2 - 6 April 2020 through 10 April 2020
ER -