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The measurement sequence of one volunteer. The line shows the superior-inferior (SI) position of the couch. The first interval (ini (white)) initializes the couch-tracking system. The colored intervals indicate the three segments: static (blue), track (green) and chirp (orange). During the track segments, the couch moved in accordance with the volunteer’s respiration. During the chirp segment, the couch moved sinusoidally independent of the respiration
