I had SRT in 2010 after surgery in 2009. And I just had SRT, nothing else.
The crucial thing with my treatment was I beleive that there was a great deal of talking between my surgical team and the SRT team. Someone from the surgical team even sat in on the planning meeting when they worked out how to shape the beam to hit the target area.
At my last RT check-up they also said that the fact that the SRT got my PSA down to undetectable, and that it's been undetectable for five years since then, indicates to them that the only cancer cells left in my body after surgery were the ones in the area they targetted during the SRT. They said that had there been any other cancer cells somewhere else, then they would not have remained dormant this long and would have now been big enough to have started producing enough PSA for it to be detectable.
There was no hormone therapy to mask the effect of the SRT, thus the SRT acted as both the diagnositic tool and the solution at the same time.
Now. Nobody has told me this, so it's a calculated guess, but I can imagine that on looking at my pathology report the RT team would have thought, well if there was some PCa by the bladder neck and some in the seminal vesicles, then the area near there is where there might still be some cacner cells to be causing the post surgery recurrence, so that's the area we will target.
I think the question you could ask the RT doctors is which area they want to target and what is their reasoning behind hitting that spot as opposed to any other.
They do not just target an area like a sphere near where the prostate was, but actually shape a beam to hit specific areas, as this photo from my blog about
my SRT shows:1.bp.blogspot.com/-P52m7_qWDr8/UFgoOgPZFOI/AAAAAAAAANs/eHAykihwuIY/s1600/SDC10429+-+kopie.jpg
The photo was taken in the RT control room while I was being blasted and if you look in the bottom right hand corner, then you will see a monitor screen with an irregular grey shape on it: that is the very irregular shaped target area.
And, if you're interested in the rest of my blog about
having SRT then see:englishalf.blogspot.nl/2012/09/aprilmayjune-2010-having-rt.html?view=magazine