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The Dual-layer stacked multileaf collimator system and a conceptual realization of 5 mm field shaping. The central panel illustrates the “per-leaf” tracking method used by Halcyon in the first generation, whereas the right side panel shows the 5 mm field shaping produced by both the leaf banks as seen in beam’s eye view (BEV) with the 2 layers colored with different tones of blue.
