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Gamma heatmap of the moving phantom with a 40%–60% gating window under 2 mm/2% and 1 mm/1% criteria. (a and d) The measured portal image acquired with the 2‐cm and 4‐cm phantoms, respectively. (b and c) The heatmaps for the 2‐cm phantoms under 2 mm/2% and 1 mm/1% criteria, respectively. (e and f) The heatmaps for the 4‐cm phantoms under 2 mm/2% and 1 mm/1% criteria, respectively
