TABLE 1.

Features of the RefleXion X1 treatment device

RefleXion X1 features	Description
Ring‐mounted gantry rotation	60 RPM
Source to isocenter distance	85 cm
Treatment beam	6 MV FFF
Nominal dose rate	850 MU/min
MLC design	Binary, 64, 6.25 mm leaf width
Maximum clinical field size	40 × 2 cm
Couch motion during delivery	Step (2.1 mm) and shoot
kVCT	Fan beam CT, 16‐slice
PET detectors	Dual 90° arcs