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Hybrid method of strain estimation in optical coherence elastography using combined sub‐wavelength phase measurements and supra‐pixel displacement tracking
Author(s) -
Zaitsev Vladimir Y.,
Matveyev Alexander L.,
Matveev Lev A.,
Gelikonov Grigory V.,
Gubarkova Ekaterina V.,
Gladkova Natalia D.,
Vitkin Alex
Publication year - 2016
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.201500203
Subject(s) - decorrelation , robustness (evolution) , wavelength , elastography , pixel , optics , phase (matter) , optical coherence tomography , coherence (philosophical gambling strategy) , displacement (psychology) , physics , computer science , acoustics , algorithm , ultrasound , biochemistry , chemistry , quantum mechanics , gene , psychology , psychotherapist
A novel hybrid method which combines sub‐wavelength‐scale phase measurements and pixel‐scale displacement tracking for robust strain mapping in compressional optical coherence elastography is proposed. Unlike majority of OCE methods it does not rely on initial reconstruction of displacements and does not suffer from the phase‐wrapping problem for super‐wavelength displacements. Its robustness is enabled by direct fitting of local phase gradients obviating the necessity of phase unwrapping and error‐prone numerical differentiation. Furthermore, axial displacements significantly exceeding not only the optical wavelength, but pixel scales (i.e., multiple wavelengths) can be efficiently tracked and compensated. This feature strongly reduces errors in phase‐gradient estimation and ensures high robustness with respect to both additive and decorrelation noises.Illustration of exceptionally high tolerance of the proposed method to noises: contrast of only 25% in the stiffness of the layers is clearly seen in the strain map even for equal intensities of the OCT signal and additive noise (SNR = 0 dB).