title: Use of the delta-P1 approximation for recovery of optical absorption, scattering, and asymmetry coefficients in turbid media.
abstract: We introduce a robust method to recover optical absorption, reduced scattering, and single-scattering asymmetry coefficients (microa, micro's, g1) of infinite turbid media over a range of (micro's/microa) spanning 3 orders of magnitude. This is accomplished through the spatially resolved measurement of irradiance at source-detector separations spanning 0.25-8 transport mean free paths (l*). These measurements are rapidly processed by a multistaged nonlinear optimization algorithm in which the measured irradiances are compared with predictions given by the delta-P1 variant of the diffusion approximation to the Boltzmann transport equation. The ability of the delta-P1 model to accurately describe radiative transport within media of arbitrary albedo and on spatial scales comparable to l* is the key element enabling the separation of g1 from micro's.
authors.affiliation: Department of Biomedical Engineering and the Laser Microbeam and Medical Program, Beckman Laser Institute, University of California-Irvine, Irvine, California 92697, USA.
authors.forename: Carole K
authors.initials: CK
authors.lastname: Hayakawa
authors.forename: Brian Y
authors.initials: BY
authors.lastname: Hill
authors.forename: Joon S
authors.initials: JS
authors.lastname: You
authors.forename: Frédéric
authors.initials: F
authors.lastname: Bevilacqua
authors.forename: Jerome
authors.initials: J
authors.lastname: Spanier
authors.forename: Vasan
authors.initials: V
authors.lastname: Venugopalan
mesh_terms: D000465:Algorithms; D008962:Models, Theoretical; D055095:Optics and Photonics; D012542:Scattering, Radiation