Fig. 1. Schematic diagram of continuous terahertz attenuated total reflection imaging system

Fig. 2. Resolution of continuous terahertz attenuated total reflection imaging system

Fig. 3. mNSS scores of sham and different degrees of bTBI tissues

Fig. 4. MRI images of rat brain. (a) Control group; (b) mild bTBI group; (c) moderate bTBI group

Fig. 5. TTC staining results of brain TTC of sham and different degrees of bTBI tissues

Fig. 6. Physical photographs of mouse brain tissue and corresponding terahertz wave imaging results. Physical photographs for (a) normal, (b) mild trauma, and (c) moderate trauma of mouse brain tissue; (d)--(f) THz imaging results corresponding to Figs. 6(a)--(c)

Fig. 7. Preprocessing and standardization of THz images

Fig. 8. Feature extraction process of THz images. (a) Diagram of intensity distribution feature extraction in spatial domain;(b) diagram of statistical distribution feature extraction based on normalized gray histogram

Fig. 9. Accuracy of brain trauma recognition varying with eigenvalue