Thank you for that. I spoke with the radiation technologist yesterday, while waiting for my husband's radiation treatment. I asked him if they do SBRT and he said yes they do but the doctor decides which way to go. Apparently, the radiation my husband is receiving is photons. He only has two treatments. I had been reading, yesterday , that there are photons and protons. It seemed that proton was preferable but photons are what my husband has received. I just want tomorrow to come and for it to be over for my husband. I pray that it has been beneficial. I just don't know how or when they determine if it, indeed, has destroyed cancer cells. The oncologist said that there will be no PSMA probably until my husband has been on hormone therapy for two years. I find that that hormone therapy is difficult for him, as well. Some days, I just feel so lost.