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. 2013 Mar 11;40(4):041901. doi: 10.1118/1.4793724

Figure 2.

Figure 2

Conventional 4D CBCT acquisition method [(a) and (b)] compared to RT 4D CBCT acquisition method [(c) and (d)]. Part (a) shows two 4 s respiratory cycles with a sinusoidal respiratory signal (lower) and a pulse train for the imaging system acquiring projections (upper). “Bin 1” is highlighted as the vertical shaded box. Part (b) shows the corresponding gantry angles for the clustered projections in “Bin 1” over three respiratory cycles. Part (c) is analogous to (a) except that the pulse train is only triggered once per respiratory phase bin in RT 4D CBCT and (d) shows the corresponding gantry angles for a single projection per respiratory phase bin.