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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2014 Apr 1;88(5):1167–1174. doi: 10.1016/j.ijrobp.2013.12.015

Figure 1.

Figure 1

Trajectory determination from 2-dimensional (2D) fiducial positions measured with electronic portal imaging device cine MV imaging. The blue, green, and red crosses represent the positions of the 3 fiducials as derived from their 2D localization. The black solid line corresponds to the determined prostate displacement. AP = anteroposterior; LAT = lateral.