Endoscopic Raman Spectroscopy for Molecular Fingerprinting of Gastric Cancer: Principle to Implementation

Figure 4

Schematic presentation of Raman spectroscopy instrument. When excitation light irradiates (green line), Rayleigh scattering (blue line) and Raman scattering (red dotted line) are released. Rayleigh scattering is filtered, and pure Raman scattering is detected.