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Assessment of corneal viscoelasticity using elastic wave optical coherence elastography
Author(s) -
Jin Zi,
Zhou Yuheng,
Shen Meixiao,
Wang Yuanyuan,
Lu Fan,
Zhu Dexi
Publication year - 2020
Publication title -
journal of biophotonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 66
eISSN - 1864-0648
pISSN - 1864-063X
DOI - 10.1002/jbio.201960074
Subject(s) - viscoelasticity , attenuation , optics , phase velocity , frequency domain , acoustic radiation force , fast fourier transform , elastography , optical coherence tomography , fourier transform , keratoconus , materials science , physics , acoustics , cornea , mathematical analysis , mathematics , ultrasound , algorithm , composite material
The corneal viscoelasticity have great clinical significance, such as the early diagnosis of keratoconus. In this work, an analysis method which utilized the elastic wave velocity, frequency and energy attenuation to assess the corneal viscoelasticity is presented. Using phase‐resolved optical coherence tomography, the spatial‐temporal displacement map is derived. The phase velocity dispersion curve and center frequency are obtained by transforming the displacement map into the wavenumber‐frequency domain through the 2D fast Fourier transform (FFT). The shear modulus is calculated through Rayleigh wave equation using the phase velocity in the high frequency. The normalized energy distribution is plotted by transforming the displacement map into the spatial‐frequency domain through the 1D FFT. The energy attenuation coefficient is derived by exponential fitting to calculate the viscous modulus. Different concentrations of tissue‐mimicking phantoms and porcine corneas are imaged to validate this method, which demonstrates that the method has the capability to assess the corneal viscoelasticity.