Surg-13. Stimulated Raman Scattering Microscopy Provides Diagnostic Intraoperative Histopathologic Images in Brain Tumor Patients

Orringer, Daniel; Pandian, Balaji; Hollon, Todd; Niknafs, Yashar S.; Boyle, Julianne; Lewis, Spencer; Hervey-Jumper, Shawn L.; Garton, Hugh; Maher, Cormac O.; Heth, Jason; Sagher, Oren; Snuderl, Matija; Venneti, Sriram; Ramkissoon, Shakti; McFadden, Kathryn; Fisher-Hubbard, Amanda; Lieberman, Andrew P.; Johnson, Timothy D.; Xie, Xuejun; Freudiger, Christian W.; Camelo-Piragua, Sandra

doi:10.1093/neuonc/now212.814

Cited by 2 publications

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“…Contrary to CARS, SRS is free of nonresonant background and scales linearly with the molecular concentration 7 . These key features initiated the development of SRS imaging technologies [8][9][10][11][12][13][14][15][16][17] and facilitated their successful applications in biology [18][19][20][21] , chemistry 22,23 and medicine [24][25][26][27] as a quantitative and label free chemical imaging modality.…”

Section: Introductionmentioning

confidence: 99%

Noise in stimulated Raman scattering measurement: From basics to practice

Audier

Heuke

Volz³

et al. 2020

APL Photonics

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We revisit laser intensity noise in the context of stimulated Raman scattering (SRS), which has recently proved to be a key technique to provide label free images of chemical bonds in biological and medical samples. Contrary to most microscopy techniques, which detect a weak photon flux resulting from light matter interactions, SRS is a pump-probe scheme that works in the high flux regime and happens as a weak modulation (10 −4 − 10 −6 ) in a strong laser field. As a result, laser noise is a key issue in SRS detection. This practical tutorial provides the experimentalists with the tools required to assess the amount of noise and the ultimate SRS detection limit in a conventional lock-in-based SRS system. We first define the quantities that are relevant when discussing intensity noise, and illustrate them through a conventional model of light detection by a photodiode. Stimulated Raman Scattering is then introduced in its lock-in-based implementation, and the model presented is adapted in this particular case. The power spectral density (PSD), relative intensity noise (RIN), signal to noise ratio (SNR), and sensitivity of the system are derived and discussed. Two complementary methods are presented that allow measurement of the RIN and assessment of the performance of a SRS system. Such measurements are illustrated on two commercial laser systems. Finally, the consequences of noise in SRS are discussed, and future developments are suggested. The presentation is made simple enough for under-graduated, graduated students, and newcomers in the field of stimulated Raman, and more generally in pump-probe based schemes.

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