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The reference motion–time curve in this phantom. The vertical axis represents the percentage of motion amplitude normalized to the maximum displacement between end of exhalation (EOE, t = 0.0 seconds) and end of inhalation (EOI, t = 2.0 seconds). Blue dots indicate the time points that are corresponding to the generated 10-phase volumes. Both diaphragm motion and anterior–posterior (AP) chest motion are modeled by this curve.
