Abstract:
: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).
journal_name
J Biophotonicsjournal_title
Journal of biophotonicsauthors
Zaitsev VY,Matveyev AL,Matveev LA,Gelikonov GV,Gubarkova EV,Gladkova ND,Vitkin Adoi
10.1002/jbio.201500203subject
Has Abstractpub_date
2016-05-01 00:00:00pages
499-509issue
5eissn
1864-063Xissn
1864-0648journal_volume
9pub_type
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