CONCLUSION
Based on our limited dataset, we were able to demonstrate the feasibility of CSI treatment planning for RefleXion X1. The successfully generated RefleXion plans resulted in comparable dosimetric indices between RefleXion X1 and Eclipse VMAT plans, as no statistically significant differences were detected in the PTV near maximum dose or average Dmean to critical structures except the bowel bag. Despite having longer average beam-on time than VMAT plans, RefleXion X1 utilizes a moving couch to allow for single-isocenter technique by encompassing the entire volume in one scan, potentially reducing translational and dosimetric match errors associated with multi-isocenter setups using C-arm linear accelerators.