Single-scan scatter correction in CBCT by using projection correlation based view interpolation (PC-VI) and a stationary ring-shaped beam stop array (BSA)

TL;DR

This paper introduces a practical single-scan scatter correction method for CBCT using a stationary ring-shaped BSA combined with PC-VI, eliminating the need for moving BSA and improving clinical applicability.

Contribution

It proposes a novel stationary BSA design that acts as a virtual moving BSA, enabling effective scatter correction with high accuracy in a single scan.

Findings

Stationary BSA effectively replaces moving BSA in scatter correction.

The proposed scheme enhances practicality and reduces mechanical complexity.

System design principles are validated through evaluation.

Abstract

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.