n used to sample the signal and the rapid scanning technique has been employed during THz imaging. The cuvette placed on a five-axis mount holds the sample for raster scanning. To maintain relative humidity of less than 10% during the experiment, nitrogen gas is purged in the path of the THz beam. The closed experi- ment setup is purged with nitrogen gas in-order to maintain the relative humidity of less than 10% and to make it free from atmospheric absorption. The absorption and reflectance spectra of paraffin embedded tumor-cancer and healthy tissues can be observed in Figure 3 of Doradla et al. (2017) where the tumor assisted cancer cell has shown less absorption at 1.2 THz and .4THz than the healthy cell spectra. This result shows the signature of other substances causing absorption rather than the water content. The images of normal and tumor-cancer cells using digital photos as well as THz absorption and reflection can be visualized in Figure 4 of Doradla et al. (2017). The absorption figures (see Figure 3 [Doradla, Joseph, & Giles (2017)]) show more con- trast between the healthy and tumor-cancer tissues than the figures from the reflection and optical images. Terahertz absorbance images and stained microanatomy images representing tumor-cancer and normal tissue can also be observed in Figure 10 of Doradla et al. (2017). It is noticeable that the THz absorption is higher for the tumor- cancer tissue than the healthy tissue. Thus, these are a very few examples of THz applications in biomedical and healthcare systems. THz spectroscopy and imaging give accurate and reliable infor- mation in early-stage identification of infected areas. 12.12 CONCLUSION AND FUTURE ASPECTS The common method to diagnose tumors is biopsy which is time-consuming and tedious. Magnetic resonance imaging and X-ray CT imaging are also used but these cause higher radiation doses. To detect cancer tissue in their early stages, terahertz technology can be efficiently used as it is non ionizing, has a short imaging time, and less radiatio