It's been long enough since the radiation treatment that any we should be able to tell whether or not the treatment actually worked. The way to do that is via a bone scan, which I had this morning.
The scan is in two parts: the injection of a radioactive tracer that settles in the bones and is excreted through the urine, and the scan itself, where a machine detects how much of the tracer has been absorbed into each part of each bone. Any areas where there's either additional or less tracer are areas of interest. Sometimes those areas are non-cancer related (for example, the scan picks up my arthritis and the degeneration I have in my lower back) but we'll be paying special attention to the sternum.
I lie flat on my back on a table for the scan. This time they did three passes of the scanner: one from head to toe parallel to me and directly above and below me, one at about a 30 degree angle to my chest, and one that spiraled around my chest. The actual scan took about 45 minutes and then I was done!
I see my oncologist for the results in a week, on June 9. I expect the results to be good.