he terahertz detected signal [Kazemi, Mahani, & Mokhtari (2019)]. Our recent work on interdigitated photoconductive antennas provides a strong terahertz signal which can help to detect biological substances. 12.2 APPLICATIONS OF THZ IN HEALTHCARE SYSTEMS Recent advancements in terahertz (THz) technology have opened vast THz applications such as THz spectroscopy, imaging, and chemical analysis. The terahertz frequency band has many applications in healthcare and privacy concerns. In the bio- medical field, THz spectroscopy has great potential to detect cancer, and for the deter- mination of pathological tissue, and the like. The unique characteristics of terahertz frequencies such as low photon energy, non-ionizing features, and SO forth, can be used to assess blood glucose level by monitoring under human skin, hence, it is very useful for diabetic patients in the treatment and prevention of diabetes. Some of the biological samples with various substances like water, proteins, fats, blood, tissue, fiber, vein, and SO on, are hard to detect by optical or x-ray imaging but terahertz can detect and distinguish the infected and healthy tissues present in the sample. Blood analysis which is very important in the diagnosis of cancer tumors, can also be achieved through THz imaging and spectroscopy. More than 80% of epithelial tissues are responsible for the growth of several adult cancers, such as lung cancer, skin cancer, breast cancer, colon cancer, liver cancer, bladder cancer, prostate cancer, and SO on [Arnone, Ciesla, & Pepper (2000)]. Terahertz radiation can be used to image the human skin for which a penetration depth of a few millimetres is adequate. The biop- sies of anomalous skin tissues can be mitigated by the early detection and diagnosis of skin cancers using THz radiation. This is because THz imaging has the ability to dis- tinguish the spectral fingerprints of surface proteins which are the markers for certain cancers. This early-stage detection of cancer using THz analysis reduces the death rate as wel