What fractionation and dose constraints do you use for prostate SBRT?

UCLA King Protocol

8 Gy x5

PTV 95% of PTV volume to get 95-110% rx dose

Rectum

V50 (20 Gy) < 50%

V80 (32 Gy) < 20%

V90 (36 Gy) < 10 %

V100 (40Gy) < 5%

Bladder

V50 (20 Gy) < 40%

V100 (40 Gy) < 1.1%

Femurs

V40 (16 Gy) < 5%

Small Bowel

V50 (20Gy) < 1%