Diagnostic genomic profiling constitutes one of the major challenges to cure brain tumors. The deployment of such analyses depends on the quality of the surgical specimen sent for histopathological examination and further molecular studies. The aim of our study was to assess the potential added value of Stimulated Raman Histology (SRH) for the assessment of freshly excised central nervous system samples. We showed that SRH enabled a near-instant microscopic examination of various central nervous system samples without any tissue processing such as labelling, freezing nor sectioning. Following SRH imaging, we demonstrated that the samples could be readily recovered and reintroduced into a conventional pathology workflow including immunohistochemistry and genomic profiling to establish a definitive diagnosis.
We present a shot noise limited, three-color SRS implementation to address two molecular vibrations simultaneously. The system allows fast, high quality stimulated Raman histology as well as background-free SRS imaging. It is ready to be tested in hospitals for its viability and image quality in comparison to classical rapid histology.
It is based on a mode-locked fs-laser from which 2 narrow-band Stokes laser beams are extracted and subsequently modulated at 13 and 20MHz. The center part of the fs-laser is frequency doubled to pump a picosecond optical parametric oscillator, which can be tuned from 500 to 5000 cm−1.
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