SAW propagation in in-vivo human skin

Citation Author(s):
Kanheng
Zhou
Kairui
Feng
Chunhui
Li
Chunhui
Li
Submitted by:
Kanheng Zhou
Last updated:
Sun, 10/04/2020 - 12:00
DOI:
10.21227/g0wd-x211
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Abstract 

Representative, normalized and flattened axial particle displacement fields of surface acoustic wave (SAW) propagating in in-vivo human skin at different sites used to generate Fig. 5 in Zhou's study "A Weighted Average Phase Velocity Inversion Model for Depth-Resolved Elasticity Evaluation in Human Skin In-Vivo".

 

Instructions: 

There are 3 ".mat" files in this ".zip" file. One for palm, one for forearm and the other for back of hand. There are matrix/vectors of the flattened structure image, flattened SAW axial displacement fields, the reconstructed phase velocity dispersion curve and the estimated shear wave velocities of each layer. The phase velocity dispersion curve was reconstructed based on the flattened SAW axial displacement fields through a 2D FFT analysis (described in detail in Zhou's paper "High‐intensity‐focused ultrasound and phase‐sensitive optical coherence tomography for high resolution surface acoustic wave elastography"). The estimated shear wave velocities of each layer were obtained by fitting the reconstructed phase velocity dispersion curve into the proposed WAPV inversion model. 

Here give the descriptions of each variable in each file:

  • Str - flattened structure image
  • vzStr - vector of axial distance for structure image in the unit of mm
  • vxStr - vector of lateral distance for structure image  in the unit of mm
  • Thk_epidermis - the thickness of the epidermis layer in the unit of mm
  • Thk_dermis - the thickness of the dermis layer in the unit of mm
  • Phframe - flattened SAW axial displacement field extracted from the sample surface
  • vxPhframe - vector of lateral distance for Phframe in the unit of mm
  • vtPhframe - vector of time for Phframe in the unit of s
  • Freq - vector of frequency in the unit of kHz
  • Cr - vector of reconstructed phase velocity dispersion curve 
  • Freqfit - vector of the frequency for Crfit in the unit of kHz
  • Crfit - vector of phase velocity curve predicted by WAPV inversion model
  • Cs_epi - estimated shear wave velocity of the epidermis layer
  • Cs_der - estimated shear wave velocity of the dermis layer
  • Cs_hypo - estimated shear wave velocity of the hypodermis layer