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. Author manuscript; available in PMC: 2020 May 8.
Published in final edited form as: Phys Med Biol. 2019 May 8;64(10):10NT01. doi: 10.1088/1361-6560/ab1c0c

Figure 2.

Figure 2

Diagram for selection of limited projections for LP-CBCT reconstruction. The breath hold projections were clustering sampled to simulate a free breath patient. The projections falls into the light green region were selected to reconstruct one phase of 4D-CBCT. The patient breath period was 4 s and gantry rotation speed was 6 ° s−1. Totally 15 breath periods were included in a 1 min scan with 10 phases each period. The green cluster stands for the projection selecting for phase 1. Each cluster has 6 projections.