I guess then you are speaking about a seed-only approach? Yeah, no longer in vogue; it did have many successes but also more failures than other modalities.
But what they do now is temporary high energy seed placement for one hour - as a boost. The seeds are then removed and a few weeks later you have 5 SBRT treatments, sometimes with ADT. I met a few men at Sloan Kettering recently who were having this done.
One of the big problems they had with permanent seed placement was that some of them broke free and migrated to the lungs, where the radioactive seed caused cancer….I would stay away if I were you.