A measurement system and method for measuring a relative concentration of a first form of a chromophore having a first form and a second form. The method comprises irradiating a tissue sample with light at a plurality of wavelengths within a wavelength range within which the first and second forms of...http://www.google.de/patents/US5879294?utm_source=gb-gplus-sharePatent US5879294 - Tissue chromophore measurement system
