  In the scatter correction for x-ray Cone Beam (CB) CT, the single-scan scheme
with moving Beam Stop Array (BSA) offers reliable scatter measurement with low
dose, and by using Projection Correlation based View Interpolation (PC-VI), the
primary fluence shaded by the moving BSA (during scatter measurement) could be
recovered with high accuracy. However, the moving BSA may increase the
mechanical burden in real applications. For better practicability, in this
paper we proposed a PC-VI based single-scan scheme with a ring-shaped
stationary BSA, which serves as a virtual moving BSA during CB scan, so the
shaded primary fluence by this stationary BSA can be also well recovered by
PC-VI. The principle in designing the whole system is deduced and evaluated.
The proposed scheme greatly enhances the practicability of the single-scan
scatter correction scheme.
