MANTIS is a multispectral imagining system, based on a new diagnostic technique recently developed in a collaboration between MIT-PSFC, EPFL, and DIFFER and used to monitor the discharges in the fusion experiment (TCV’s system and MAST-U). The MANTIS system collects light through a single window in the tokamak and feeds it to ten cameras that each look at a very narrow wavelength band. MANTIS can analyse density, temperature and the presence of impurities in real time with accuracy. Outside fusion applications, Tthis technology makes it possible to detect also medical impurities in the human body (as cancer) or impurities in materials.