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. Author manuscript; available in PMC: 2013 Apr 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2012 Apr 1;82(5):e709–e716. doi: 10.1016/j.ijrobp.2011.05.042

Figure 1.

Figure 1

Example of (a) 3D surrogate marker motion data (solid) projected onto its first principle component (arrow) line (dashed) to obtain (b) a 1D representation of respiration-induced surrogate marker motion.