Stereotactic body radiation therapy (SBRT) for prostate cancer: Improving treatment delivery efficiency and accuracy

•Double- and single-arc VMAT plans were compared for linac-based prostate SBRT.•Plans with high quality and low complexity were obtained with both arrangements.•2 % 2 mm mean gamma passing rates were above 96.5 %•A significant reduction of delivery time (>56 %) was achieved with single arcs 10 MV FFF.•The very fast delivery (∼1.3 min/8 Gy) improves robustness against intrafraction motion.