The Beth Israel website contains a description of intraoperative radiation therapy (IORT), along with descriptions of stereo-tactic surgery and brachytherapy -- evidently three different ways of getting radiation boosts to a targeted area in a short time. (Several other hospitals with major cancer units have similar descriptions on their sites as well.)

I don't know whether any of the regular posters here have had IORT -- hopefully if they have, they will let you know. I can only tell you that I was dreading the prospect of brachytherapy, coming on the heels of my conventional radiation treatments, and it turned out to be almost a non-event in terms of pain and after-effects.

Cathy