Figure 2

Beam entry/exit trajectories for stairwise and spiral acquisition schemes from the sample’s point of view. The number of turns n and the total number of projections are indicated on top of the plots. The tilt angle \(\beta\) for the shown stairwise trajectory with \(n=1\) is \({0}^{\circ }\) but it can be chosen to be any angle between \({0}^{\circ }\) and \({45}^{\circ }\).