Terahertz radiation is found in the electromagnetic spectrum between the microwave region (where satellite dishes and mobile phones work) and infra-red light, but ways to generate detect and analyse terahertz radiation are not as advanced as other imaging techniques.


The big problem in using this band for direct treatment of cancers is that it has not yet been demonstrated to have any influence, for better or worse, on tissues below the intensity at which burns due to absorption of very high levels of RF occur (as happens with all radio waves). It is the up-and-coming technology for imaging, though, having better resolution than ultrasound without the side- effects of X-ray.

I'd be mildly sceptical about the report- RF treatment has been experimented with since the 1900s, electrical treatment since the 1800s, and magnets long before that, without any spectacular breakthroughs.