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. Author manuscript; available in PMC: 2013 Nov 21.
Published in final edited form as: Phys Med Biol. 2012 Oct 24;57(22):7395–7407. doi: 10.1088/0031-9155/57/22/7395

Figure 5.

Figure 5

The MV imager measured target position, aperture position and tracking error of three typical tumour motion traces during 5-field delivery featuring (a) fast breathing, (b) irregular amplitude, and (c) baseline drifts during the beam delivery. The left column shows the trajectory of the marker and the following MLC aperture in each direction on MV images, where the longitudinal position corresponds to motion in the SI direction. The right column shows histograms of tracking error without (no tracking) and with (tracking) real-time localisation.