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a A schematic view of the slab phantom with the epoxy slab in grey and the CFP-T implant in black. b, c The contoured PTVs of the anthropomorphic phantom (red), the spinal cord (yellow), the high density components (green) and bony areas (blue) for PTV1 (b) and PTV2(c), respectively. The red dashed lines on all images indicate the planes where film measurements were carried out
