CONCLUSION
reduced intrafraction motion errors
Compared to the SBRT‐dedicated TrueBeam, Halcyon APBI plans provided similar plan quality and treatment delivery accuracy, yet potentially faster treatment via a fully‐automated one‐step patient setup and verification procedure with no patient collision concern. Rapid delivery of daily APBI on the Fast‐Forward trial on Halcyon with door‐to‐door patient time < 10 min, reduced intrafraction motion errors, and improved patient comfort and compliance were achieved. We have started treating APBI via the Fast‐Forward trial on Halcyon RDS. We recommend Halcyon users considering implementing the Fast‐Forward protocol to provide the service of high‐quality therapeutic breast treatments to remote and underserved APBI patients in Halcyon‐only clinics.