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Different cone-beam projections used for FDK reconstruction to simulate 4D-CBCT from 4D-CT images.
| # of projections per phase | Angle distributions | Geometry |
|---|---|---|
| 72 | Evenly | Half fan |
| 120 | Evenly | Half fan |
| 144 | Evenly | Half fan |
| 180 | Evenly | Half fan |
| ~100 (Real elekta projections) | Unevenly | Full fan |
| ~300 (Real varian projections) | Unevenly | Half fan |
