First of all, this seems like a very interesting field of science! The basic principle involves using an array of ultrasound transducers to focus the ultrasound to a point and thereby maximize the energy in this point. This leads to an increase in temperature which can be used to destroy (or rather ablate) something without exposing it (i.e. cutting into the human body). All without exposing the patient to any ionizing radiation.

I tried to dig up some recent articles on the matter actually discussing the technology involved, but didn’t find too much at first glance. Will look more and update if I find something interesting. I found two books that seemed relevant at first, but then fell through: MRI-guided Focused Ultrasound Surgery (seems to be for practitioners and not about the actual technology involved) and a compendium which seems to be just an aggregation of Wikipedia articles.

Anyway, check out the video – Yaov Medan presents some amazing successful cases.