title: Noninvasive measurement of scattering anisotropy in turbid materials by nonnormal incident illumination.
abstract: Many existing methods for the recovery of optical parameters from turbid materials rely on the diffusion approximation, which does not permit the recovery of the degree of anisotropy in the scattering phase function. These methods also make the explicit assumption that light is normally incident at the top surface of the material. We demonstrate a steady-state imaging technique that uses nonnormally incident light to determine anisotropy parameter g by fitting Monte Carlo simulation results to high dynamic range images of the intensity profiles of samples. The proposed method is simpler than existing methods and does not rely on thin samples to produce reasonable results.
authors.affiliation: Department of Computer Science and Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0404, USA. njoshi@cs.ucsd.edu
authors.forename: Neel
authors.initials: N
authors.lastname: Joshi
authors.forename: Craig
authors.initials: C
authors.lastname: Donner
authors.forename: Henrik Wann
authors.initials: HW
authors.lastname: Jensen
mesh_terms: D000465:Algorithms; D016880:Anisotropy; D003198:Computer Simulation; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008027:Light; D008954:Models, Biological; D015233:Models, Statistical; D009010:Monte Carlo Method; D009391:Nephelometry and Turbidimetry / Q000379:methods*; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D041622:Tomography, Optical / Q000379:methods*