Investigation of Formalin-Fixed Tissue Optical Characteristics in the Range of 200–500 GHz Using Pulsed Terahertz Reflection Spectroscopy to Differentiate Oral Malignant, Benign, and Cyst

Figure 2

(a) The time-domain spectral line from the sample surface. (b) Frequency domain spectral lines passing through the sample surface. (c) Refractive index. (d) Absorption coefficient spectra. (e) Extinction coefficient spectra. (f) Mean refractive index of oral cancer, benign and cyst. (g) Mean absorption coefficient of oral cancer, benign and cyst. (h) Mean extinction coefficient of oral cancer, benign and cyst. The blue, red, and green lines indicate the oral squamous cell carcinoma, benign (ameloblastoma), and cyst, respectively.

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