Absorption and scattering of laser light in biological media - Mathematical modeling and methods for determining the optical properties

Miscellaneous · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5511933

Yoon, G W

First, a mathematical model for light scattering in homogeneous media is developed. Second, methods for determining the optical properties of tissue such as absorption and scattering coefficients and the phase function are introduced. The proposed seven flux model approximates light scattering using seven directional fluxes. An analytic solution for a one dimensional geometry and numerical solutions for higher dimensional geometries are presented. The behavior of the seven flux model is examined by correlating it with more accurate solutions of radiative transfer theory. The proposed model provides improved results compared with the currently-used models such as Kubelka-Munk theory and the diffusion approximation, and as well as allowing geometrical flexibilities which are difficult to achieve with more accurate solutions. Next, new methods are developed to determine optical properties. Absorption and scattering coefficients are determined base don transmission measurements for isotropic scattering. Additional measurements of the phase function and collimated attenuation are required for anisotropic scattering. Measurements with the gel samples and the human aortic walls at the wavelength of 633 nm show highly forward scattering behaviors.

• Research Organization: Texas Univ., Austin, TX (USA)
• OSTI ID: 5511933
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
LASER RADIATION
BIOLOGICAL EFFECTS
OPTICAL PROPERTIES
MEASURING METHODS
ABSORPTION
AORTA
MAN
MATHEMATICAL MODELS
ANIMALS
ARTERIES
BLOOD VESSELS
BODY
CARDIOVASCULAR SYSTEM
ELECTROMAGNETIC RADIATION
MAMMALS
ORGANS
PHYSICAL PROPERTIES
PRIMATES
RADIATIONS
VERTEBRATES
560400* - Other Environmental Pollutant Effects