There is no redo on radiation since there is a lifetime radiation limit. SBRT is typically 5 sessions. There is also IMRT/IGRT either hypo-fractionated at 20 to 28 fractions or traditional at 35+ fractions. As you noted this can treat the area around the prostate. The more fractions the lower the dose per fraction and usually milder side effects. Also, no RP surgery after radiation so this is an important decision. If young (< 60) might want to start with surgery even though that has a high percentage of reoccurrence.