Method of measuring tissue optical properties using an optical beam of oblique incidence and uses thereof
OwnerLihong Wang, Steven L. Jacquesinventors
Life of this patent
Estimating the term…
Abstract
The present invention provides a method of determining the reduced scattering coefficient of a turbid medium having a smaller absorption coefficient than the reduced scattering coefficient by directing an optical beam obliquely incident to the medium and determining the reduced scattering coefficient as a function of the distance between the incident point and the center of the diffused reflectance, the incident angle, the relative refractive index and the reduced scattering coefficient.
Claims8
A method of determining the reduced scattering coefficient of a turbid medium having an absorption coefficient less than the reduced scattering coefficient of said medium, comprising the steps of:
- directing an optical beam that is obliquely incident upon said medium;
- determining the reduced scattering coefficient of the medium using the diffuse reflectance profile based on the following formula:
- ##EQU7## wherein .DELTA.x is the distance between the incident point and the center of the diffuse reflectance that is several transport mean free paths away from the center;
- .alpha..sub.i is the incident angle;
- n is the relative refractive index;
- and
- .mu..sub.s ' is the reduced scattering coefficient.
A method of determining an optical property of a turbid medium having an absorption coefficient similar to the reduced scattering coefficient of the medium, comprising the steps of:
- directing an optical beam that is obliquely incident upon said medium;
- determining the reduced scattering coefficient of the medium using the diffuse reflectance profile based on the following formula:
- ##EQU8## wherein .DELTA.x is the distance between the incident point and the center of the diffuse reflectance that is several transport mean free paths away from the center;
- .alpha..sub.i is the incident angle;
- n is the relative refractive index;
- .mu.a is the absorption coefficient;
- and
- .mu..sub.s ' is the reduced scattering coefficient.
Dependencies are inferred from the claim text.