Fig. 2
Cone-beam projection of two volume slabs. It shows a cone-beam projection of the cubic volume in the centre on the detector plane on the right. Two slabs in the volume are outlined in black, and indicated by North-West (NW) diagonal patterns and North-East (NE) diagonal patterns. The projections of these two slabs are correspondingly patterned with NW, respectively, NE diagonals. The solidly filled area shows where the projections of the two slabs overlap