So you pick out a small lesion in the lung and really focus on it, pinpoint the treatment as opposed to treating a larger area, ... It reduces toxicity and allows you to deliver a very high dose. That's basically where radiation is evolving.
The future of radiation tends to be what we call stereotactic: radiation, which focuses on the tumor and applies large doses at one time as opposed to traditional radiation which is small doses over a longer time, ... There is a gamma knife that's dedicated to treating brain lesions where, instead of radiating the brain in a three-week period, it's a one-time focused, high-powered type treatment.