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. Author manuscript; available in PMC: 2018 Mar 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2016 Nov 9;97(3):596–605. doi: 10.1016/j.ijrobp.2016.11.004

Figure 3.

Figure 3

Plots of concurrent navigator vs. bellows in two subjects (Volunteer 1:A&C and Volunteer 6:B&D). In A&B, acquisition points are binned in navigator amplitude level (X) and bellows amplitude level (Y). The evenly-distributed and separated navigator bins become spread and overlapping in bellows bins. The inhalation (red) and exhalation (blue) processes do not overlap in bellows level. In C&D, overlays of amplitude bin (X) vs. respiratory level (Y) for navigator and bellows. A phase shift is observed between the navigator-binned and bellows-binned waveforms.