Endoscopic cross-polarization spectrometer as an instrument for puncture diagnostics

A modification of the polarization reflection spectroscopy method is proposed with the use of a polarization-maintaining single-mode fiber. The choice of the fiber made it possible to create an optimal self-consistent system for the illumination of a biological tissue and the reception of scattered radiation and to create a probe compatible with any endoscopic equipment. The first clinical results of diagnosing tumor diseases with the created instrument showed that it is possible to determine the tumor-norm boundary, which is very important for organ-preserving operations. All of the results obtained by this method agree well with the results obtained by the method of polarization-sensitive optical coherence tomography.