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Comparative Study of Breast Normal and Cancer Cells Using Coherent Anti-Stokes Raman Scattering Microspectroscopy Imaging

A coherent anti-Stokes Raman scattering (CARS) microspectroscopy imaging system was developed using a femtosecond laser and a photonic crystal fiber (PCF). We separated resonant and non-resonant CARS signals in the time domain by the chirp of the PCF, and applied this system to compare live human breast normal and cancer cells. The CARS image and spectrum at C–H stretch vibration in lipid droplets could subsequently be used to differentiate cancer cells from normal cells, thereby confirming the potential of the CARS microspectroscopy imaging system as a diagnostic tool that allows the high-sensitivity, high-resolution, and fast detection of breast cancer.