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BACKGROUND:

Interest exists in dual-energy computed tomography (DECT) imaging with scanning arcs of limited-angular ranges (LARs) for reducing scan time and radiation dose, and for enabling scan configurations of C-arm CT that can avoid possible collision between the rotating X-ray tube/detector and the imaged subject.

OBJECTIVE:

In this work, we investigate image reconstruction for a type of configurations of practical DECT interest, referred to as the two-orthogonal-arc configuration, in which low-and high-kVp data are collected over two non-overlapping arcs of equal LAR α, ranging from 30 to 90, separated by 90. The configuration can readily be implemented, eg, on CT with dual sources separated by 90 or with the slow-kVp-switching technique.

METHODS:

The directional-total-variation (DTV) algorithm developed previously for image reconstruction in conventional, single-energy CT is tailored to enable …