1.Beckman Laser Institute, University of California, Irvine, Irvine, CA 92612, USA
2.Department of Biomedical Engineering, University of California, Irvine, Irvine, CA 92617, USA
3.Department of Physics, Kookmin University, Seoul 02707, South Korea
Zhongping Chen (z2chen@uci.edu)
纸质出版日期:2020,
网络出版日期:2020-04-13,
收稿日期:2019-10-29,
修回日期:2020-03-16,
录用日期:2020-03-19
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Ultrahigh-sensitive optical coherence elastography[J]. LSA, 2020,9(3):610-619.
Li, Y. et al. Ultrahigh-sensitive optical coherence elastography. Light: Science & Applications, 9, 610-619 (2020).
Ultrahigh-sensitive optical coherence elastography[J]. LSA, 2020,9(3):610-619. DOI: 10.1038/s41377-020-0297-9.
Li, Y. et al. Ultrahigh-sensitive optical coherence elastography. Light: Science & Applications, 9, 610-619 (2020). DOI: 10.1038/s41377-020-0297-9.
The phase stability of an optical coherence elastography (OCE) system is the key determining factor for achieving a precise elasticity measurement
and it can be affected by the signal-to-noise ratio (SNR)
timing jitters in the signal acquisition process
and fluctuations in the optical path difference (OPD) between the sample and reference arms. In this study
we developed an OCE system based on swept-source optical coherence tomography (SS-OCT) with a common-path configuration (SS-OCE
CP
). Our system has a phase stability of 4.2 mrad without external stabilization or extensive post-processing
such as averaging. This phase stability allows us to detect a displacement as small as ~300 pm. A common-path interferometer was incorporated by integrating a 3-mm wedged window into the SS-OCT system to provide intrinsic compensation for polarization and dispersion mismatch
as well as to minimize phase fluctuations caused by the OPD variation. The wedged window generates two reference signals that produce two OCT images
allowing for averaging to improve the SNR. Furthermore
the electrical components are optimized to minimize the timing
jitters and prevent edge collisions by adjusting the delays between the trigger
k-clock
and signal
utilizing a high-speed waveform digitizer
and incorporating a high-bandwidth balanced photodetector. We validated the SS-OCE
CP
performance in a tissue-mimicking phantom and an in vivo rabbit model
and the results demonstrated a significantly improved phase stability compared to that of the conventional SS-OCE. To the best of our knowledge
we demonstrated the first SS-OCE
CP
system
which possesses high-phase stability and can be utilized to significantly improve the sensitivity of elastography.
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