Patent ID: 7254432

Claim:
A method for use in non-invasive measurements in a patient's body, the method comprising: (a) performing several measurement sessions on a measurement location on the body, each measurement session comprising illuminating a measurement location with light of at least two different wavelengths and detecting at least two light responses of the measurement location corresponding to said at least two different wavelengths of light, and generating data indicative of the detected response, wherein the measurement sessions include at least two measurement sessions carried out at a first condition of normal blood flow in the measurement location enabling generation of first measured data indicative of a first time variation of the response for each of said at least two different wavelengths, and at least two measurement sessions carried out at a second condition of artificial kinetics in the measurement location enabling generation of second measured data indicative of a second time variation of the response for each of said at least two different wavelengths; and (b) processing the first measured data to determine a first relation between the first time variations for the different wavelengths and processing the second measured data to determine a second relation between the second time variations for said different wavelengths, each of the first and second relations is determined as a parametric slope of the respective time functions of the responses; and (c) utilizing the first and second relations to determine a certain function between said first and second relations, thereby enabling determination of at least one blood related parameter BP as follows BP = ∑ i = 1 N ⁢ A i · ( PS 1 ) i + ∑ i = 1 M ⁢ B i · ( PS 2 ) i wherein A i and B i are calibration coefficients; (PS 1 ) i and (PS 2 ) i are first and second parametric slopes obtained for the same pair of wavelengths; and i is a number of wavelengths.