Fig. 1. Schematic diagram of continuous THz wave reflection imaging system

Fig. 2. Measurement of the focal spot size by the knife-edge method

Fig. 3. The subcutaneous breast cancer of mouse model

Fig. 4. The sample is (a) not and (b) in close contact with the reflection window

Fig. 5. Breast cancer tissue of mouse (a) the visual images of sample in contact with reflection window and (b) reflection images of THz wave. (a) The white dotted area is the tumor in contact with reflection window and (b) The black dotted area is the normal tissue in contact with reflection window.

Fig. 6. (a), (b) and (c) show the normalized relative reflectivity of the horizontal purple dotted lines of Fig.3 (b) NO.1, NO.2 and NO.3, respectively.

Fig. 7. The freshly excised breast cancer tissue of mice

Fig. 8. Staining images of freshly excised breast cancer tissue (NO.1) at different depths from skin surface