Patent ID: 8017407

Claim:
A method for measuring at least one parameter related to the blood of a subject, the method comprising the procedures of: emitting light with at least one emitter, at least one measurement wavelength within the spectral range of 380-980 nm, toward a body part containing at least one blood vessel; obtaining spatially resolved reflection measurements, by capturing light reflected by said body part, with at least one reflectance detector; extracting at least one of the adsorption coefficient (μ′ s ) and the reduced scattering coefficient (μ′ s ) of the blood component of said body part at each of said at least one wavelength, from said measurements; extracting the temporal derivatives of said at least one of said adsorption coefficient and said reduced scattering coefficient ( ∂ μ s ′ ∂ t ⁢ ⁢ and ⁢ ⁢ ∂ μ a ∂ t ) ; ⁢ and calculating said parameter using the ratio of said temporal derivatives at a single wavelength, for each of said at least one measurement wavelength.