An instrument for evaluating fluorescence of a heterogeneous tissue includes means for exciting a two-dimensional portion of the tissue surface with excitation radiation at a plurality of excitation wavelengths, means for collecting emission radiation from the two-dimensional portion of the tissue surface...http://www.google.se/patents/US6597932?utm_source=gb-gplus-sharePatent US6597932 - Generation of spatially-averaged excitation-emission map in heterogeneous tissue
