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The results for a 102° beam gantry angle of a head and neck IMRT treatment are displayed in (a) patient CT scan containing the isocentre point (red point), (b) EPID signal profiles, (c) R ratio on different days, (d) reference EPID image, (e) current EPID image, (f) map of points with γ > 1 (g) map of points with γ > 1 on the sagittal DRR image.
