PHOTON-ECHO SPECTROSCOPY ON BIOLOGICAL-SYSTEMS .1. APPLICATION TO TISSUES

The fluorescence detection technique of incoherent accumulated photon echo is applied to the investigation of animal and human tissues. The correlation between the kind of animal tissue and the dephasing time i s determined. The dephasing times of normal and cancerous human tissue s are measured by this technique. The cancer tissues exhibit shorter d ephasing times than the normal tissues, and this is interpreted as bei ng caused by the large number of conformational substates of cancer ti ssues. The dephasing time of a benign-tumor tissue is also measured an d shows a value similar to that of the normal tissue. The dephasing ti me of a metastasizing cancer region is also measured. The applicabilit y of photon-echo spectroscopy to diagnosis is noted.