Fig. 8From: Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvementProstate cancer cells with and without nanoparticles [50]. a An optical image. b A THz image obtained without NIR laser irradiation. c A THz image obtained after NIR laser irradiation. d Reflection amplitudes along the lines depicted in panels (b) (black) and (c) (red). e Differential images obtained by subtracting panels (b) and (c)Back to article page