Approximating the acoustic reflection coefficient of lossy biological tissues.
The amplitude acoustic reflection coefficient of an interface between two lossy biological tissues can be approximated as Rlossy approximately Rlossless + i delta/2 where Rlossless is the lossless acoustic reflection coefficient and delta is the change in alpha/kappa (absorption coefficient per wavenumber) across the tissue interface. This approximation is shown to be valid for both normal and oblique angles of incidence.
Le
L H
LH
Department of Radiology and Diagnostic Imaging, Walter C Mackenzic Health Sciences Centre, University of Alberta, Edmoñton, Canada. le@raddi.uah.ualberta.ca
Filipow
L J
LJ
D000162:Acoustics; D008962:Models, Theoretical; D015203:Reproducibility of Results; D014463:Ultrasonography / Q000379:methods*